Support Spi in i2c-multi-instantiate driver

This functions were previously made private since they were not used. However, these functions will be needed again.

Partial revert of commit da21fde0fdb3
("spi: Make several public functions private to spi.c")

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/spi/spi.c       |  6 ++++--
 include/linux/spi/spi.h | 12 ++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

drivers/spi/spi.c +4 -2

index 4599b121d744..1eb84101c4ad 100644
@@ -532,7 +532,7 @@ static DEFINE_MUTEX(board_lock);
  *
  * Return: a pointer to the new device, or NULL.
  */
-static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
+struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 {
 	struct spi_device	*spi;
 

@@ -557,6 +557,7 @@ static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 	device_initialize(&spi->dev);
 	return spi;
 }
+EXPORT_SYMBOL_GPL(spi_alloc_device);
 
 static void spi_dev_set_name(struct spi_device *spi)
 {

@@ -652,7 +653,7 @@ static int __spi_add_device(struct spi_device *spi)
  *
  * Return: 0 on success; negative errno on failure
  */
-static int spi_add_device(struct spi_device *spi)
+int spi_add_device(struct spi_device *spi)
 {
 	struct spi_controller *ctlr = spi->controller;
 	struct device *dev = ctlr->dev.parent;

@@ -673,6 +674,7 @@ static int spi_add_device(struct spi_device *spi)
 	mutex_unlock(&ctlr->add_lock);
 	return status;
 }
+EXPORT_SYMBOL_GPL(spi_add_device);
 
 static int spi_add_device_locked(struct spi_device *spi)
 {

include/linux/spi/spi.h +12 -0

index 7ab3fed7b804..0346a3ff27fd 100644
@@ -1452,7 +1452,19 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
  * use spi_new_device() to describe each device.  You can also call
  * spi_unregister_device() to start making that device vanish, but
  * normally that would be handled by spi_unregister_controller().
+ *
+ * You can also use spi_alloc_device() and spi_add_device() to use a two
+ * stage registration sequence for each spi_device. This gives the caller
+ * some more control over the spi_device structure before it is registered,
+ * but requires that caller to initialize fields that would otherwise
+ * be defined using the board info.
  */
+extern struct spi_device *
+spi_alloc_device(struct spi_controller *ctlr);
+
+extern int
+spi_add_device(struct spi_device *spi);
+
 extern struct spi_device *
 spi_new_device(struct spi_controller *, struct spi_board_info *);
 

Hi,

Quoted 4 lines · Stefan Binding

This functions were previously made private since they were not used. However, these functions will be needed again.

Quoted 4 lines

Partial revert of commit da21fde0fdb3
("spi: Make several public functions private to spi.c")

Signed-off-by Stefan Binding <[email protected]>

Thanks, patch looks good to me:

Reviewed-by Hans de Goede <[email protected]>

Quoted 68 lines

---
 drivers/spi/spi.c       |  6 ++++--
 include/linux/spi/spi.h | 12 ++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

drivers/spi/spi.c +4 -2

index 4599b121d744..1eb84101c4ad 100644
@@ -532,7 +532,7 @@ static DEFINE_MUTEX(board_lock);
  *
  * Return: a pointer to the new device, or NULL.
  */
-static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
+struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 {
      struct spi_device       *spi;
 

@@ -557,6 +557,7 @@ static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
      device_initialize(&spi->dev);
      return spi;
 }
+EXPORT_SYMBOL_GPL(spi_alloc_device);
 
 static void spi_dev_set_name(struct spi_device *spi)
 {

@@ -652,7 +653,7 @@ static int __spi_add_device(struct spi_device *spi)
  *
  * Return: 0 on success; negative errno on failure
  */
-static int spi_add_device(struct spi_device *spi)
+int spi_add_device(struct spi_device *spi)
 {
      struct spi_controller *ctlr = spi->controller;
      struct device *dev = ctlr->dev.parent;

@@ -673,6 +674,7 @@ static int spi_add_device(struct spi_device *spi)
      mutex_unlock(&ctlr->add_lock);
      return status;
 }
+EXPORT_SYMBOL_GPL(spi_add_device);
 
 static int spi_add_device_locked(struct spi_device *spi)
 {

include/linux/spi/spi.h +12 -0

index 7ab3fed7b804..0346a3ff27fd 100644
@@ -1452,7 +1452,19 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
  * use spi_new_device() to describe each device.  You can also call
  * spi_unregister_device() to start making that device vanish, but
  * normally that would be handled by spi_unregister_controller().
+ *
+ * You can also use spi_alloc_device() and spi_add_device() to use a two
+ * stage registration sequence for each spi_device. This gives the caller
+ * some more control over the spi_device structure before it is registered,
+ * but requires that caller to initialize fields that would otherwise
+ * be defined using the board info.
  */
+extern struct spi_device *
+spi_alloc_device(struct spi_controller *ctlr);
+
+extern int
+spi_add_device(struct spi_device *spi);
+
 extern struct spi_device *
 spi_new_device(struct spi_controller *, struct spi_board_info *);
 

Quoted 11 lines · Hans de Goede

Hi,

Quoted 7 lines · Stefan Binding

This functions were previously made private since they were not used. However, these functions will be needed again.

Partial revert of commit da21fde0fdb3
("spi: Make several public functions private to spi.c")

Quoted 5 lines

Quoted 1 line

Signed-off-by Stefan Binding <[email protected]>

Thanks, patch looks good to me:

Reviewed-by Hans de Goede <[email protected]>

The series also looks good to me from the ACPI side, so what tree should it go into?

Quoted 70 lines

Quoted 69 lines

---
 drivers/spi/spi.c       |  6 ++++--
 include/linux/spi/spi.h | 12 ++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

drivers/spi/spi.c +4 -2

index 4599b121d744..1eb84101c4ad 100644
@@ -532,7 +532,7 @@ static DEFINE_MUTEX(board_lock);
  *
  * Return: a pointer to the new device, or NULL.
  */
-static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
+struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
 {
      struct spi_device       *spi;
 

@@ -557,6 +557,7 @@ static struct spi_device *spi_alloc_device(struct spi_controller *ctlr)
      device_initialize(&spi->dev);
      return spi;
 }
+EXPORT_SYMBOL_GPL(spi_alloc_device);
 
 static void spi_dev_set_name(struct spi_device *spi)
 {

@@ -652,7 +653,7 @@ static int __spi_add_device(struct spi_device *spi)
  *
  * Return: 0 on success; negative errno on failure
  */
-static int spi_add_device(struct spi_device *spi)
+int spi_add_device(struct spi_device *spi)
 {
      struct spi_controller *ctlr = spi->controller;
      struct device *dev = ctlr->dev.parent;

@@ -673,6 +674,7 @@ static int spi_add_device(struct spi_device *spi)
      mutex_unlock(&ctlr->add_lock);
      return status;
 }
+EXPORT_SYMBOL_GPL(spi_add_device);
 
 static int spi_add_device_locked(struct spi_device *spi)
 {

include/linux/spi/spi.h +12 -0

index 7ab3fed7b804..0346a3ff27fd 100644
@@ -1452,7 +1452,19 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
  * use spi_new_device() to describe each device.  You can also call
  * spi_unregister_device() to start making that device vanish, but
  * normally that would be handled by spi_unregister_controller().
+ *
+ * You can also use spi_alloc_device() and spi_add_device() to use a two
+ * stage registration sequence for each spi_device. This gives the caller
+ * some more control over the spi_device structure before it is registered,
+ * but requires that caller to initialize fields that would otherwise
+ * be defined using the board info.
  */
+extern struct spi_device *
+spi_alloc_device(struct spi_controller *ctlr);
+
+extern int
+spi_add_device(struct spi_device *spi);
+
 extern struct spi_device *
 spi_new_device(struct spi_controller *, struct spi_board_info *);
 

This can then be used to find a spi resource inside an ACPI node, and allocate a spi device.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/spi/spi.c       | 46 ++++++++++++++++++++++++++++++++---------
 include/linux/spi/spi.h |  6 ++++++
 2 files changed, 42 insertions(+), 10 deletions(-)

drivers/spi/spi.c +36 -10

index 1eb84101c4ad..13f4701f0694 100644
@@ -2410,8 +2410,18 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
 	return 1;
 }
 
-static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
-					    struct acpi_device *adev)
+/**
+ * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
+ * @ctlr: controller to which the spi device belongs
+ * @adev: ACPI Device for the spi device
+ *
+ * This should be used to allocate a new spi device from and ACPI Node.
+ * The caller is responsible for calling spi_add_device to register the spi device.
+ *
+ * Return: a pointer to the new device, or ERR_PTR on error.
+ */
+struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
+					 struct acpi_device *adev)
 {
 	acpi_handle parent_handle = NULL;
 	struct list_head resource_list;

@@ -2419,10 +2429,6 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 	struct spi_device *spi;
 	int ret;
 
-	if (acpi_bus_get_status(adev) || !adev->status.present ||
-	    acpi_device_enumerated(adev))
-		return AE_OK;
-
 	lookup.ctlr		= ctlr;
 	lookup.irq		= -1;
 

@@ -2433,7 +2439,7 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 
 	if (ret < 0)
 		/* found SPI in _CRS but it points to another controller */
-		return AE_OK;
+		return ERR_PTR(-ENODEV);
 
 	if (!lookup.max_speed_hz &&
 	    ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) &&

@@ -2443,16 +2449,15 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 	}
 
 	if (!lookup.max_speed_hz)
-		return AE_OK;
+		return ERR_PTR(-ENODEV);
 
 	spi = spi_alloc_device(ctlr);
 	if (!spi) {
 		dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n",
 			dev_name(&adev->dev));
-		return AE_NO_MEMORY;
+		return ERR_PTR(-ENOMEM);
 	}
 
-
 	ACPI_COMPANION_SET(&spi->dev, adev);
 	spi->max_speed_hz	= lookup.max_speed_hz;
 	spi->mode		|= lookup.mode;

@@ -2460,6 +2465,27 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 	spi->bits_per_word	= lookup.bits_per_word;
 	spi->chip_select	= lookup.chip_select;
 
+	return spi;
+}
+EXPORT_SYMBOL_GPL(acpi_spi_device_alloc);
+
+static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
+					    struct acpi_device *adev)
+{
+	struct spi_device *spi;
+
+	if (acpi_bus_get_status(adev) || !adev->status.present ||
+	    acpi_device_enumerated(adev))
+		return AE_OK;
+
+	spi = acpi_spi_device_alloc(ctlr, adev);
+	if (IS_ERR(spi)) {
+		if (PTR_ERR(spi) == -ENOMEM)
+			return AE_NO_MEMORY;
+		else
+			return AE_OK;
+	}
+
 	acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias,
 			  sizeof(spi->modalias));
 

include/linux/spi/spi.h +1 -0

index 0346a3ff27fd..d159cef12f1a 100644
@@ -16,6 +16,7 @@
 #include <linux/gpio/consumer.h>
 
 #include <uapi/linux/spi/spi.h>
+#include <linux/acpi.h>
 
 struct dma_chan;
 struct software_node;

include/linux/spi/spi.h +0 -0

 /*
  * SPI resource management while processing a SPI message
  */

-----Original Message-----
From: Hans de Goede <[email protected]>
Sent: 01 February 2022 14:28
To: Stefan Binding <[email protected]>; Mark Brown <[email protected]>; Rafael J . Wysocki <[email protected]>; Len Brown <[email protected]>; Mark Gross <[email protected]>; Jaroslav Kysela <[email protected]>; Takashi Iwai <[email protected]>
Cc: [email protected]; [email protected]; linux- [email protected]; [email protected]; platform-driver- [email protected]; [email protected]
Subject: Re: [PATCH v6 2/9] spi: Create helper API to lookup ACPI info for spi device

Hi,

drivers/spi/spi.c static int acpi_spi_add_resource(struct

Quoted 14 lines · Stefan Binding

This can then be used to find a spi resource inside an ACPI node, and allocate a spi device.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/spi/spi.c       | 46 ++++++++++++++++++++++++++++++++---------
 include/linux/spi/spi.h |  6 ++++++
 2 files changed, 42 insertions(+), 10 deletions(-)

drivers/spi/spi.c +0 -0

index 1eb84101c4ad..13f4701f0694 100644
@@ -2410,8 +2410,18 @@ static int acpi_spi_add_resource(struct

acpi_resource *ares, void *data)

drivers/spi/spi.c static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)

Quoted 7 lines

drivers/spi/spi.c +2 -2

 	return 1;
 }
 
-static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
-					    struct acpi_device *adev)
+/**
+ * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI

information

drivers/spi/spi.c static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)

Quoted 5 lines

drivers/spi/spi.c +5 -0

+ * @ctlr: controller to which the spi device belongs
+ * @adev: ACPI Device for the spi device
+ *
+ * This should be used to allocate a new spi device from and ACPI Node.
+ * The caller is responsible for calling spi_add_device to register the spi

device.

drivers/spi/spi.c static acpi_status

Quoted 9 lines

drivers/spi/spi.c +5 -0

+ *
+ * Return: a pointer to the new device, or ERR_PTR on error.
+ */
+struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
+					 struct acpi_device *adev)
 {
 	acpi_handle parent_handle = NULL;
 	struct list_head resource_list;

@@ -2419,10 +2429,6 @@ static acpi_status

acpi_register_spi_device(struct spi_controller *ctlr,

drivers/spi/spi.c static acpi_status acpi_register_spi_device(struct

Quoted 11 lines

drivers/spi/spi.c +0 -4

 	struct spi_device *spi;
 	int ret;
 
-	if (acpi_bus_get_status(adev) || !adev->status.present ||
-	    acpi_device_enumerated(adev))
-		return AE_OK;
-
 	lookup.ctlr		= ctlr;
 	lookup.irq		= -1;
 

@@ -2433,7 +2439,7 @@ static acpi_status acpi_register_spi_device(struct

spi_controller *ctlr,

drivers/spi/spi.c static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,

Quoted 8 lines

drivers/spi/spi.c +1 -1

 	if (ret < 0)
 		/* found SPI in _CRS but it points to another controller */
-		return AE_OK;
+		return ERR_PTR(-ENODEV);
 
 	if (!lookup.max_speed_hz &&
 	    ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle))

&&

drivers/spi/spi.c static acpi_status

Quoted 1 line

drivers/spi/spi.c +0 -0

@@ -2443,16 +2449,15 @@ static acpi_status

acpi_register_spi_device(struct spi_controller *ctlr,

drivers/spi/spi.c static acpi_status

Quoted 19 lines

drivers/spi/spi.c +2 -3

 	}
 
 	if (!lookup.max_speed_hz)
-		return AE_OK;
+		return ERR_PTR(-ENODEV);
 
 	spi = spi_alloc_device(ctlr);
 	if (!spi) {
 		dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n",
 			dev_name(&adev->dev));
-		return AE_NO_MEMORY;
+		return ERR_PTR(-ENOMEM);
 	}
 
-
 	ACPI_COMPANION_SET(&spi->dev, adev);
 	spi->max_speed_hz	= lookup.max_speed_hz;
 	spi->mode		|= lookup.mode;

@@ -2460,6 +2465,27 @@ static acpi_status

acpi_register_spi_device(struct spi_controller *ctlr,

include/linux/spi/spi.h extern int devm_spi_register_controller(struct

Quoted 40 lines

drivers/spi/spi.c +21 -0

 	spi->bits_per_word	= lookup.bits_per_word;
 	spi->chip_select	= lookup.chip_select;
 
+	return spi;
+}
+EXPORT_SYMBOL_GPL(acpi_spi_device_alloc);
+
+static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
+					    struct acpi_device *adev)
+{
+	struct spi_device *spi;
+
+	if (acpi_bus_get_status(adev) || !adev->status.present ||
+	    acpi_device_enumerated(adev))
+		return AE_OK;
+
+	spi = acpi_spi_device_alloc(ctlr, adev);
+	if (IS_ERR(spi)) {
+		if (PTR_ERR(spi) == -ENOMEM)
+			return AE_NO_MEMORY;
+		else
+			return AE_OK;
+	}
+
 	acpi_set_modalias(adev, acpi_device_hid(adev), spi->modalias,
 			  sizeof(spi->modalias));
 

include/linux/spi/spi.h +1 -0

index 0346a3ff27fd..d159cef12f1a 100644
@@ -16,6 +16,7 @@
 #include <linux/gpio/consumer.h>
 
 #include <uapi/linux/spi/spi.h>
+#include <linux/acpi.h>
 
 struct dma_chan;
 struct software_node;

@@ -759,6 +760,11 @@ extern int devm_spi_register_controller(struct

device *dev,

include/linux/spi/spi.h extern int devm_spi_register_controller(struct device *dev, · line 767

Quoted 8 lines

include/linux/spi/spi.h +5 -0

 					struct spi_controller *ctlr);
 extern void spi_unregister_controller(struct spi_controller *ctlr);
 
+#if IS_ENABLED(CONFIG_ACPI)
+extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
+						struct acpi_device *adev);
+#endif
+

There is no need to add a #ifdef about something which is just a function prototype. Having this declared when CONFIG_ACPI is not set is harmless, please drop the #ifdef.

With that fixed, please add my R-b to the next version:

Reviewed-by Hans de Goede <[email protected]>

Regards,

Hans

Quoted 7 lines

include/linux/spi/spi.h +0 -0

 /*
  * SPI resource management while processing a SPI message
  */

I was just fixing this, however, I just noticed that a subset of this chain - including this patch - just got applied. Do you want me to fix this in a separate patch?

If a node contains more than one Spi Resources, it may be necessary to use an index to select which one you want to allocate a spi device for.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/spi/spi.c       | 51 +++++++++++++++++++++++++++++++++++------
 include/linux/spi/spi.h |  3 ++-
 2 files changed, 46 insertions(+), 8 deletions(-)

drivers/spi/spi.c +44 -7

index 13f4701f0694..06c0a308b38b 100644
@@ -2320,6 +2320,8 @@ struct acpi_spi_lookup {
 	int			irq;
 	u8			bits_per_word;
 	u8			chip_select;
+	int			n;
+	int			index;
 };
 
 static void acpi_spi_parse_apple_properties(struct acpi_device *dev,

@@ -2351,6 +2353,8 @@ static void acpi_spi_parse_apple_properties(struct acpi_device *dev,
 		lookup->mode |= SPI_CPHA;
 }
 
+static struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);
+
 static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
 {
 	struct acpi_spi_lookup *lookup = data;

@@ -2364,14 +2368,35 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
 		sb = &ares->data.spi_serial_bus;
 		if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_SPI) {
 
+			if (lookup->index != -1 && lookup->n++ != lookup->index)
+				return 1;
+
+			if (lookup->index == -1 && !ctlr)
+				return -ENODEV;
+
 			status = acpi_get_handle(NULL,
 						 sb->resource_source.string_ptr,
 						 &parent_handle);
 
-			if (ACPI_FAILURE(status) ||
-			    ACPI_HANDLE(ctlr->dev.parent) != parent_handle)
+			if (ACPI_FAILURE(status))
 				return -ENODEV;
 
+			if (ctlr) {
+				if (ACPI_HANDLE(ctlr->dev.parent) != parent_handle)
+					return -ENODEV;
+			} else {
+				struct acpi_device *adev;
+
+				if (acpi_bus_get_device(parent_handle, &adev))
+					return -ENODEV;
+
+				ctlr = acpi_spi_find_controller_by_adev(adev);
+				if (!ctlr)
+					return -ENODEV;
+
+				lookup->ctlr = ctlr;
+			}
+
 			/*
 			 * ACPI DeviceSelection numbering is handled by the
 			 * host controller driver in Windows and can vary

@@ -2414,14 +2439,21 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
  * acpi_spi_device_alloc - Allocate a spi device, and fill it in with ACPI information
  * @ctlr: controller to which the spi device belongs
  * @adev: ACPI Device for the spi device
+ * @index: Index of the spi resource inside the ACPI Node
  *
  * This should be used to allocate a new spi device from and ACPI Node.
  * The caller is responsible for calling spi_add_device to register the spi device.
  *
+ * If ctlr is set to NULL, the Controller for the spi device will be looked up
+ * using the resource.
+ * If index is set to -1, index is not used.
+ * Note: If index is -1, ctlr must be set.
+ *
  * Return: a pointer to the new device, or ERR_PTR on error.
  */
 struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
-					 struct acpi_device *adev)
+					 struct acpi_device *adev,
+					 int index)
 {
 	acpi_handle parent_handle = NULL;
 	struct list_head resource_list;

@@ -2429,8 +2461,13 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
 	struct spi_device *spi;
 	int ret;
 
+	if (!ctlr && index == -1)
+		return ERR_PTR(-EINVAL);
+
 	lookup.ctlr		= ctlr;
 	lookup.irq		= -1;
+	lookup.index		= index;
+	lookup.n		= 0;
 
 	INIT_LIST_HEAD(&resource_list);
 	ret = acpi_dev_get_resources(adev, &resource_list,

@@ -2443,7 +2480,7 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
 
 	if (!lookup.max_speed_hz &&
 	    ACPI_SUCCESS(acpi_get_parent(adev->handle, &parent_handle)) &&
-	    ACPI_HANDLE(ctlr->dev.parent) == parent_handle) {
+	    ACPI_HANDLE(lookup.ctlr->dev.parent) == parent_handle) {
 		/* Apple does not use _CRS but nested devices for SPI slaves */
 		acpi_spi_parse_apple_properties(adev, &lookup);
 	}

@@ -2451,9 +2488,9 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
 	if (!lookup.max_speed_hz)
 		return ERR_PTR(-ENODEV);
 
-	spi = spi_alloc_device(ctlr);
+	spi = spi_alloc_device(lookup.ctlr);
 	if (!spi) {
-		dev_err(&ctlr->dev, "failed to allocate SPI device for %s\n",
+		dev_err(&lookup.ctlr->dev, "failed to allocate SPI device for %s\n",
 			dev_name(&adev->dev));
 		return ERR_PTR(-ENOMEM);
 	}

@@ -2478,7 +2515,7 @@ static acpi_status acpi_register_spi_device(struct spi_controller *ctlr,
 	    acpi_device_enumerated(adev))
 		return AE_OK;
 
-	spi = acpi_spi_device_alloc(ctlr, adev);
+	spi = acpi_spi_device_alloc(ctlr, adev, -1);
 	if (IS_ERR(spi)) {
 		if (PTR_ERR(spi) == -ENOMEM)
 			return AE_NO_MEMORY;

include/linux/spi/spi.h +2 -1

index d159cef12f1a..e5bbb9cbd3d7 100644
@@ -762,7 +762,8 @@ extern void spi_unregister_controller(struct spi_controller *ctlr);
 
 #if IS_ENABLED(CONFIG_ACPI)
 extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
-						struct acpi_device *adev);
+						struct acpi_device *adev,
+						int index);
 #endif
 
 /*

Some ACPI nodes may have more than one Spi Resource. To be able to handle these case, its necessary to have a way of counting these resources.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/spi/spi.c       | 40 ++++++++++++++++++++++++++++++++++++++++
 include/linux/spi/spi.h |  1 +
 2 files changed, 41 insertions(+)

drivers/spi/spi.c +40 -0

index 06c0a308b38b..ec9f2ed579e3 100644
@@ -2324,6 +2324,46 @@ struct acpi_spi_lookup {
 	int			index;
 };
 
+static int acpi_spi_count(struct acpi_resource *ares, void *data)
+{
+	struct acpi_resource_spi_serialbus *sb;
+	int *count = data;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
+		return 1;
+
+	sb = &ares->data.spi_serial_bus;
+	if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI)
+		return 1;
+
+	*count = *count + 1;
+
+	return 1;
+}
+
+/**
+ * acpi_spi_count_resources - Count the number of SpiSerialBus resources
+ * @adev:	ACPI device
+ *
+ * Returns the number of SpiSerialBus resources in the ACPI-device's
+ * resource-list; or a negative error code.
+ */
+int acpi_spi_count_resources(struct acpi_device *adev)
+{
+	LIST_HEAD(r);
+	int count = 0;
+	int ret;
+
+	ret = acpi_dev_get_resources(adev, &r, acpi_spi_count, &count);
+	if (ret < 0)
+		return ret;
+
+	acpi_dev_free_resource_list(&r);
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(acpi_spi_count_resources);
+
 static void acpi_spi_parse_apple_properties(struct acpi_device *dev,
 					    struct acpi_spi_lookup *lookup)
 {

include/linux/spi/spi.h +1 -0

index e5bbb9cbd3d7..394b4241d989 100644
@@ -764,6 +764,7 @@ extern void spi_unregister_controller(struct spi_controller *ctlr);
 extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
 						struct acpi_device *adev,
 						int index);
+int acpi_spi_count_resources(struct acpi_device *adev);
 #endif
 
 /*

From: Lucas Tanure <[email protected]>

Rename I2C multi instantiate driver to serial-multi-instantiate for upcoming addition of SPI support

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

---
 MAINTAINERS                                   |  4 +-
 drivers/acpi/scan.c                           | 13 +--
 drivers/platform/x86/Kconfig                  | 10 +-
 drivers/platform/x86/Makefile                 |  2 +-
 ...stantiate.c => serial-multi-instantiate.c} | 91 +++++++++----------
 5 files changed, 60 insertions(+), 60 deletions(-)
 rename drivers/platform/x86/{i2c-multi-instantiate.c => serial-multi-instantiate.c} (51%)

MAINTAINERS +2 -2

index 4e828542b089..be50537ea6bd 100644
@@ -388,11 +388,11 @@ L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
 F:	drivers/acpi/arm64
 
-ACPI I2C MULTI INSTANTIATE DRIVER
+ACPI SERIAL MULTI INSTANTIATE DRIVER
 M:	Hans de Goede <[email protected]>
 L:	[email protected]
 S:	Maintained
-F:	drivers/platform/x86/i2c-multi-instantiate.c
+F:	drivers/platform/x86/serial-multi-instantiate.c
 
 ACPI PCC(Platform Communication Channel) MAILBOX DRIVER
 M:	Sudeep Holla <[email protected]>

drivers/acpi/scan.c +7 -6

index 1331756d4cfc..48db5e80c2dc 100644
@@ -1734,12 +1734,13 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 	bool is_serial_bus_slave = false;
 	static const struct acpi_device_id ignore_serial_bus_ids[] = {
 	/*
-	 * These devices have multiple I2cSerialBus resources and an i2c-client
-	 * must be instantiated for each, each with its own i2c_device_id.
-	 * Normally we only instantiate an i2c-client for the first resource,
-	 * using the ACPI HID as id. These special cases are handled by the
-	 * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
-	 * which i2c_device_id to use for each resource.
+	 * These devices have multiple SerialBus resources and a client
+	 * device must be instantiated for each of them, each with
+	 * its own device id.
+	 * Normally we only instantiate one client device for the first
+	 * resource, using the ACPI HID as id. These special cases are handled
+	 * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
+	 * knows which client device id to use for each resource.
 	 */
 		{"BSG1160", },
 		{"BSG2150", },

drivers/platform/x86/Kconfig +5 -5

index 24deeeb29af2..2e656909a866 100644
@@ -990,16 +990,16 @@ config TOPSTAR_LAPTOP
 
 	  If you have a Topstar laptop, say Y or M here.
 
-config I2C_MULTI_INSTANTIATE
-	tristate "I2C multi instantiate pseudo device driver"
+config SERIAL_MULTI_INSTANTIATE
+	tristate "Serial bus multi instantiate pseudo device driver"
 	depends on I2C && ACPI
 	help
-	  Some ACPI-based systems list multiple i2c-devices in a single ACPI
-	  firmware-node. This driver will instantiate separate i2c-clients
+	  Some ACPI-based systems list multiple devices in a single ACPI
+	  firmware-node. This driver will instantiate separate clients
 	  for each device in the firmware-node.
 
 	  To compile this driver as a module, choose M here: the module
-	  will be called i2c-multi-instantiate.
+	  will be called serial-multi-instantiate.
 
 config MLX_PLATFORM
 	tristate "Mellanox Technologies platform support"

drivers/platform/x86/Makefile +1 -1

index c12a9b044fd8..9527088bba7f 100644
@@ -110,7 +110,7 @@ obj-$(CONFIG_TOPSTAR_LAPTOP)	+= topstar-laptop.o
 
 # Platform drivers
 obj-$(CONFIG_FW_ATTR_CLASS)		+= firmware_attributes_class.o
-obj-$(CONFIG_I2C_MULTI_INSTANTIATE)	+= i2c-multi-instantiate.o
+obj-$(CONFIG_SERIAL_MULTI_INSTANTIATE)	+= serial-multi-instantiate.o
 obj-$(CONFIG_MLX_PLATFORM)		+= mlx-platform.o
 obj-$(CONFIG_TOUCHSCREEN_DMI)		+= touchscreen_dmi.o
 obj-$(CONFIG_WIRELESS_HOTKEY)		+= wireless-hotkey.o

drivers/platform/x86/serial-multi-instantiate.c renamed from drivers/platform/x86/i2c-multi-instantiate.c +45 -46

similarity index 51%
rename from drivers/platform/x86/i2c-multi-instantiate.c
rename to drivers/platform/x86/serial-multi-instantiate.c
index 4956a1df5b90..33cbb0caed33 100644
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * I2C multi-instantiate driver, pseudo driver to instantiate multiple
- * i2c-clients from a single fwnode.
+ * Serial multi-instantiate driver, pseudo driver to instantiate multiple
+ * client devices from a single fwnode.
  *
  * Copyright 2018 Hans de Goede <[email protected]>
  */

@@ -21,29 +21,29 @@
 #define IRQ_RESOURCE_GPIO	1
 #define IRQ_RESOURCE_APIC	2
 
-struct i2c_inst_data {
+struct smi_instance {
 	const char *type;
 	unsigned int flags;
 	int irq_idx;
 };
 
-struct i2c_multi_inst_data {
-	int num_clients;
-	struct i2c_client *clients[];
+struct smi {
+	int i2c_num;
+	struct i2c_client *i2c_devs[];
 };
 
-static int i2c_multi_inst_probe(struct platform_device *pdev)
+static int smi_probe(struct platform_device *pdev)
 {
-	struct i2c_multi_inst_data *multi;
-	const struct i2c_inst_data *inst_data;
 	struct i2c_board_info board_info = {};
+	const struct smi_instance *inst;
 	struct device *dev = &pdev->dev;
 	struct acpi_device *adev;
+	struct smi *smi;
 	char name[32];
 	int i, ret;
 
-	inst_data = device_get_match_data(dev);
-	if (!inst_data) {
+	inst = device_get_match_data(dev);
+	if (!inst) {
 		dev_err(dev, "Error ACPI match data is missing\n");
 		return -ENODEV;
 	}

@@ -55,33 +55,32 @@ static int i2c_multi_inst_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	multi = devm_kmalloc(dev, struct_size(multi, clients, ret), GFP_KERNEL);
-	if (!multi)
+	smi = devm_kmalloc(dev, struct_size(smi, i2c_devs, ret), GFP_KERNEL);
+	if (!smi)
 		return -ENOMEM;
 
-	multi->num_clients = ret;
+	smi->i2c_num = ret;
 
-	for (i = 0; i < multi->num_clients && inst_data[i].type; i++) {
+	for (i = 0; i < smi->i2c_num && inst[i].type; i++) {
 		memset(&board_info, 0, sizeof(board_info));
-		strlcpy(board_info.type, inst_data[i].type, I2C_NAME_SIZE);
-		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev),
-			 inst_data[i].type, i);
+		strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
+		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
 		board_info.dev_name = name;
-		switch (inst_data[i].flags & IRQ_RESOURCE_TYPE) {
+		switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
 		case IRQ_RESOURCE_GPIO:
-			ret = acpi_dev_gpio_irq_get(adev, inst_data[i].irq_idx);
+			ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
 			if (ret < 0) {
 				dev_err(dev, "Error requesting irq at index %d: %d\n",
-					inst_data[i].irq_idx, ret);
+						inst[i].irq_idx, ret);
 				goto error;
 			}
 			board_info.irq = ret;
 			break;
 		case IRQ_RESOURCE_APIC:
-			ret = platform_get_irq(pdev, inst_data[i].irq_idx);
+			ret = platform_get_irq(pdev, inst[i].irq_idx);
 			if (ret < 0) {
 				dev_dbg(dev, "Error requesting irq at index %d: %d\n",
-					inst_data[i].irq_idx, ret);
+					inst[i].irq_idx, ret);
 				goto error;
 			}
 			board_info.irq = ret;

@@ -90,48 +89,48 @@ static int i2c_multi_inst_probe(struct platform_device *pdev)
 			board_info.irq = 0;
 			break;
 		}
-		multi->clients[i] = i2c_acpi_new_device(dev, i, &board_info);
-		if (IS_ERR(multi->clients[i])) {
-			ret = dev_err_probe(dev, PTR_ERR(multi->clients[i]),
+		smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
+		if (IS_ERR(smi->i2c_devs[i])) {
+			ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]),
 					    "Error creating i2c-client, idx %d\n", i);
 			goto error;
 		}
 	}
-	if (i < multi->num_clients) {
+	if (i < smi->i2c_num) {
 		dev_err(dev, "Error finding driver, idx %d\n", i);
 		ret = -ENODEV;
 		goto error;
 	}
 
-	platform_set_drvdata(pdev, multi);
+	platform_set_drvdata(pdev, smi);
 	return 0;
 
 error:
 	while (--i >= 0)
-		i2c_unregister_device(multi->clients[i]);
+		i2c_unregister_device(smi->i2c_devs[i]);
 
 	return ret;
 }
 
-static int i2c_multi_inst_remove(struct platform_device *pdev)
+static int smi_remove(struct platform_device *pdev)
 {
-	struct i2c_multi_inst_data *multi = platform_get_drvdata(pdev);
+	struct smi *smi = platform_get_drvdata(pdev);
 	int i;
 
-	for (i = 0; i < multi->num_clients; i++)
-		i2c_unregister_device(multi->clients[i]);
+	for (i = 0; i < smi->i2c_num; i++)
+		i2c_unregister_device(smi->i2c_devs[i]);
 
 	return 0;
 }
 
-static const struct i2c_inst_data bsg1160_data[]  = {
+static const struct smi_instance bsg1160_data[]  = {
 	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
 	{ "bmc150_magn" },
 	{ "bmg160" },
 	{}
 };
 
-static const struct i2c_inst_data bsg2150_data[]  = {
+static const struct smi_instance bsg2150_data[]  = {
 	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
 	{ "bmc150_magn" },
 	/* The resources describe a 3th client, but it is not really there. */

@@ -139,7 +138,7 @@ static const struct i2c_inst_data bsg2150_data[]  = {
 	{}
 };
 
-static const struct i2c_inst_data int3515_data[]  = {
+static const struct smi_instance int3515_data[]  = {
 	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
 	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
 	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },

@@ -148,27 +147,27 @@ static const struct i2c_inst_data int3515_data[]  = {
 };
 
 /*
- * Note new device-ids must also be added to i2c_multi_instantiate_ids in
+ * Note new device-ids must also be added to serial_multi_instantiate_ids in
  * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
  */
-static const struct acpi_device_id i2c_multi_inst_acpi_ids[] = {
+static const struct acpi_device_id smi_acpi_ids[] = {
 	{ "BSG1160", (unsigned long)bsg1160_data },
 	{ "BSG2150", (unsigned long)bsg2150_data },
 	{ "INT3515", (unsigned long)int3515_data },
 	{ }
 };
-MODULE_DEVICE_TABLE(acpi, i2c_multi_inst_acpi_ids);
+MODULE_DEVICE_TABLE(acpi, smi_acpi_ids);
 
-static struct platform_driver i2c_multi_inst_driver = {
+static struct platform_driver smi_driver = {
 	.driver	= {
-		.name = "I2C multi instantiate pseudo device driver",
-		.acpi_match_table = i2c_multi_inst_acpi_ids,
+		.name = "Serial bus multi instantiate pseudo device driver",
+		.acpi_match_table = smi_acpi_ids,
 	},
-	.probe = i2c_multi_inst_probe,
-	.remove = i2c_multi_inst_remove,
+	.probe = smi_probe,
+	.remove = smi_remove,
 };
-module_platform_driver(i2c_multi_inst_driver);
+module_platform_driver(smi_driver);
 
-MODULE_DESCRIPTION("I2C multi instantiate pseudo device driver");
+MODULE_DESCRIPTION("Serial multi instantiate pseudo device driver");
 MODULE_AUTHOR("Hans de Goede <[email protected]>");
 MODULE_LICENSE("GPL");

From: Lucas Tanure <[email protected]>

Reorganize I2C functions to accommodate SPI support Split the probe and factor out parts of the code that will be used in the SPI support
Also switched from strlcpy() to strscpy()

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

---
 .../platform/x86/serial-multi-instantiate.c   | 144 +++++++++++-------
 1 file changed, 90 insertions(+), 54 deletions(-)

drivers/platform/x86/serial-multi-instantiate.c +90 -54

index 33cbb0caed33..4cd6d72a0741 100644
@@ -29,96 +29,132 @@ struct smi_instance {
 
 struct smi {
 	int i2c_num;
-	struct i2c_client *i2c_devs[];
+	struct i2c_client **i2c_devs;
 };
 
-static int smi_probe(struct platform_device *pdev)
+static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,
+		       const struct smi_instance *inst)
+{
+	int ret;
+
+	switch (inst->flags & IRQ_RESOURCE_TYPE) {
+	case IRQ_RESOURCE_GPIO:
+		ret = acpi_dev_gpio_irq_get(adev, inst->irq_idx);
+		break;
+	case IRQ_RESOURCE_APIC:
+		ret = platform_get_irq(pdev, inst->irq_idx);
+		break;
+	default:
+		return 0;
+	}
+
+	if (ret < 0)
+		dev_err_probe(&pdev->dev, ret, "Error requesting irq at index %d: %d\n",
+			      inst->irq_idx, ret);
+
+	return ret;
+}
+
+static void smi_devs_unregister(struct smi *smi)
+{
+	while (smi->i2c_num > 0)
+		i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]);
+}
+
+/**
+ * smi_i2c_probe - Instantiate multiple I2C devices from inst array
+ * @pdev:	Platform device
+ * @adev:	ACPI device
+ * @smi:	Internal struct for Serial multi instantiate driver
+ * @inst_array:	Array of instances to probe
+ *
+ * Returns the number of I2C devices instantiate, Zero if none is found or a negative error code.
+ */
+static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi,
+			 const struct smi_instance *inst_array)
 {
 	struct i2c_board_info board_info = {};
-	const struct smi_instance *inst;
 	struct device *dev = &pdev->dev;
-	struct acpi_device *adev;
-	struct smi *smi;
 	char name[32];
-	int i, ret;
+	int i, ret, count;
 
-	inst = device_get_match_data(dev);
-	if (!inst) {
-		dev_err(dev, "Error ACPI match data is missing\n");
-		return -ENODEV;
-	}
-
-	adev = ACPI_COMPANION(dev);
-
-	/* Count number of clients to instantiate */
 	ret = i2c_acpi_client_count(adev);
 	if (ret < 0)
 		return ret;
+	else if (!ret)
+		return -ENODEV;
 
-	smi = devm_kmalloc(dev, struct_size(smi, i2c_devs, ret), GFP_KERNEL);
-	if (!smi)
-		return -ENOMEM;
+	count = ret;
 
-	smi->i2c_num = ret;
+	smi->i2c_devs = devm_kcalloc(dev, count, sizeof(*smi->i2c_devs), GFP_KERNEL);
+	if (!smi->i2c_devs)
+		return -ENOMEM;
 
-	for (i = 0; i < smi->i2c_num && inst[i].type; i++) {
+	for (i = 0; i < count && inst_array[i].type; i++) {
 		memset(&board_info, 0, sizeof(board_info));
-		strlcpy(board_info.type, inst[i].type, I2C_NAME_SIZE);
-		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst[i].type, i);
+		strscpy(board_info.type, inst_array[i].type, I2C_NAME_SIZE);
+		snprintf(name, sizeof(name), "%s-%s.%d", dev_name(dev), inst_array[i].type, i);
 		board_info.dev_name = name;
-		switch (inst[i].flags & IRQ_RESOURCE_TYPE) {
-		case IRQ_RESOURCE_GPIO:
-			ret = acpi_dev_gpio_irq_get(adev, inst[i].irq_idx);
-			if (ret < 0) {
-				dev_err(dev, "Error requesting irq at index %d: %d\n",
-						inst[i].irq_idx, ret);
-				goto error;
-			}
-			board_info.irq = ret;
-			break;
-		case IRQ_RESOURCE_APIC:
-			ret = platform_get_irq(pdev, inst[i].irq_idx);
-			if (ret < 0) {
-				dev_dbg(dev, "Error requesting irq at index %d: %d\n",
-					inst[i].irq_idx, ret);
-				goto error;
-			}
-			board_info.irq = ret;
-			break;
-		default:
-			board_info.irq = 0;
-			break;
-		}
+
+		ret = smi_get_irq(pdev, adev, &inst_array[i]);
+		if (ret < 0)
+			goto error;
+		board_info.irq = ret;
+
 		smi->i2c_devs[i] = i2c_acpi_new_device(dev, i, &board_info);
 		if (IS_ERR(smi->i2c_devs[i])) {
 			ret = dev_err_probe(dev, PTR_ERR(smi->i2c_devs[i]),
 					    "Error creating i2c-client, idx %d\n", i);
 			goto error;
 		}
+		smi->i2c_num++;
 	}
-	if (i < smi->i2c_num) {
-		dev_err(dev, "Error finding driver, idx %d\n", i);
+	if (smi->i2c_num < count) {
+		dev_dbg(dev, "Error finding driver, idx %d\n", i);
 		ret = -ENODEV;
 		goto error;
 	}
 
-	platform_set_drvdata(pdev, smi);
-	return 0;
+	dev_info(dev, "Instantiated %d I2C devices.\n", smi->i2c_num);
 
+	return 0;
 error:
-	while (--i >= 0)
-		i2c_unregister_device(smi->i2c_devs[i]);
+	smi_devs_unregister(smi);
 
 	return ret;
 }
 
+static int smi_probe(struct platform_device *pdev)
+{
+	const struct smi_instance *inst_array;
+	struct device *dev = &pdev->dev;
+	struct acpi_device *adev;
+	struct smi *smi;
+
+	adev = ACPI_COMPANION(dev);
+	if (!adev)
+		return -ENODEV;
+
+	inst_array = device_get_match_data(dev);
+	if (!inst_array) {
+		dev_dbg(dev, "Error ACPI match data is missing\n");
+		return -ENODEV;
+	}
+
+	smi = devm_kzalloc(dev, sizeof(*smi), GFP_KERNEL);
+	if (!smi)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, smi);
+
+	return smi_i2c_probe(pdev, adev, smi, inst_array);
+}
+
 static int smi_remove(struct platform_device *pdev)
 {
 	struct smi *smi = platform_get_drvdata(pdev);
-	int i;
 
-	for (i = 0; i < smi->i2c_num; i++)
-		i2c_unregister_device(smi->i2c_devs[i]);
+	smi_devs_unregister(smi);
 
 	return 0;
 }

Add support for spi bus in serial-multi-instantiate driver

Some peripherals can have either a I2C or a SPI connection to the host (but not both) but use the same HID for both types. So it is not possible to use the HID to determine whether it is I2C or SPI. The driver must check the node to see if it contains I2cSerialBus or SpiSerialBus entries.

For backwards-compatibility with the existing nodes I2C is checked first and if such entries are found ONLY I2C devices are created. Since some existing nodes that were already handled by this driver could also contain unrelated SpiSerialBus nodes that were previously ignored, and this preserves that behavior. If there is ever a need to handle a node where both I2C and SPI devices must be instantiated this can be added in future.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/platform/x86/Kconfig                  |   2 +-
 .../platform/x86/serial-multi-instantiate.c   | 174 +++++++++++++++---
 2 files changed, 151 insertions(+), 25 deletions(-)

drivers/platform/x86/Kconfig +1 -1

index 2e656909a866..8d1eec208854 100644
@@ -992,7 +992,7 @@ config TOPSTAR_LAPTOP
 
 config SERIAL_MULTI_INSTANTIATE
 	tristate "Serial bus multi instantiate pseudo device driver"
-	depends on I2C && ACPI
+	depends on I2C && SPI && ACPI
 	help
 	  Some ACPI-based systems list multiple devices in a single ACPI
 	  firmware-node. This driver will instantiate separate clients

drivers/platform/x86/serial-multi-instantiate.c +108 -4

index 4cd6d72a0741..3f05385ca2cf 100644
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/spi/spi.h>
 #include <linux/types.h>
 
 #define IRQ_RESOURCE_TYPE	GENMASK(1, 0)

@@ -21,15 +22,28 @@
 #define IRQ_RESOURCE_GPIO	1
 #define IRQ_RESOURCE_APIC	2
 
+enum smi_bus_type {
+	SMI_I2C,
+	SMI_SPI,
+	SMI_AUTO_DETECT,
+};
+
 struct smi_instance {
 	const char *type;
 	unsigned int flags;
 	int irq_idx;
 };
 
+struct smi_node {
+	enum smi_bus_type bus_type;
+	struct smi_instance instances[];
+};
+
 struct smi {
 	int i2c_num;
+	int spi_num;
 	struct i2c_client **i2c_devs;
+	struct spi_device **spi_devs;
 };
 
 static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,

@@ -59,6 +73,95 @@ static void smi_devs_unregister(struct smi *smi)
 {
 	while (smi->i2c_num > 0)
 		i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]);
+
+	while (smi->spi_num > 0)
+		spi_unregister_device(smi->spi_devs[--smi->spi_num]);
+}
+
+/**
+ * smi_spi_probe - Instantiate multiple SPI devices from inst array
+ * @pdev:	Platform device
+ * @adev:	ACPI device
+ * @smi:	Internal struct for Serial multi instantiate driver
+ * @inst_array:	Array of instances to probe
+ *
+ * Returns the number of SPI devices instantiate, Zero if none is found or a negative error code.
+ */
+static int smi_spi_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi,
+			 const struct smi_instance *inst_array)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_controller *ctlr;
+	struct spi_device *spi_dev;
+	char name[50];
+	int i, ret, count;
+
+	ret = acpi_spi_count_resources(adev);
+	if (ret < 0)
+		return ret;
+	else if (!ret)
+		return -ENODEV;
+
+	count = ret;
+
+	smi->spi_devs = devm_kcalloc(dev, count, sizeof(*smi->spi_devs), GFP_KERNEL);
+	if (!smi->spi_devs)
+		return -ENOMEM;
+
+	for (i = 0; i < count && inst_array[i].type; i++) {
+
+		spi_dev = acpi_spi_device_alloc(NULL, adev, i);
+		if (IS_ERR(spi_dev)) {
+			ret = PTR_ERR(spi_dev);
+			dev_err_probe(dev, ret, "failed to allocate SPI device %s from ACPI: %d\n",
+				      dev_name(&adev->dev), ret);
+			goto error;
+		}
+
+		ctlr = spi_dev->controller;
+
+		strscpy(spi_dev->modalias, inst_array[i].type, sizeof(spi_dev->modalias));
+
+		ret = smi_get_irq(pdev, adev, &inst_array[i]);
+		if (ret < 0) {
+			spi_dev_put(spi_dev);
+			goto error;
+		}
+		spi_dev->irq = ret;
+
+		snprintf(name, sizeof(name), "%s-%s-%s.%d", dev_name(&ctlr->dev), dev_name(dev),
+			 inst_array[i].type, i);
+		spi_dev->dev.init_name = name;
+
+		ret = spi_add_device(spi_dev);
+		if (ret) {
+			dev_err_probe(&ctlr->dev, ret,
+				      "failed to add SPI device %s from ACPI: %d\n",
+				      dev_name(&adev->dev), ret);
+			spi_dev_put(spi_dev);
+			goto error;
+		}
+
+		dev_dbg(dev, "SPI device %s using chip select %u", name, spi_dev->chip_select);
+
+		smi->spi_devs[i] = spi_dev;
+		smi->spi_num++;
+	}
+
+	if (smi->spi_num < count) {
+		dev_dbg(dev, "Error finding driver, idx %d\n", i);
+		ret = -ENODEV;
+		goto error;
+	}
+
+	dev_info(dev, "Instantiated %d SPI devices.\n", smi->spi_num);
+
+	return 0;
+error:
+	smi_devs_unregister(smi);
+
+	return ret;
+
 }
 
 /**

@@ -126,8 +229,8 @@ static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev,
 
 static int smi_probe(struct platform_device *pdev)
 {
-	const struct smi_instance *inst_array;
 	struct device *dev = &pdev->dev;
+	const struct smi_node *node;
 	struct acpi_device *adev;
 	struct smi *smi;
 

@@ -135,8 +238,8 @@ static int smi_probe(struct platform_device *pdev)
 	if (!adev)
 		return -ENODEV;
 
-	inst_array = device_get_match_data(dev);
-	if (!inst_array) {
+	node = device_get_match_data(dev);
+	if (!node) {
 		dev_dbg(dev, "Error ACPI match data is missing\n");
 		return -ENODEV;
 	}

@@ -147,7 +250,21 @@ static int smi_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, smi);
 
-	return smi_i2c_probe(pdev, adev, smi, inst_array);
+	switch (node->bus_type) {
+	case SMI_I2C:

drivers/platform/x86/serial-multi-instantiate.c +32 -20

+	}
+
+	return 0; /* never reached */
 }
 
 static int smi_remove(struct platform_device *pdev)

@@ -159,27 +276,36 @@ static int smi_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct smi_instance bsg1160_data[]  = {
-	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
-	{ "bmc150_magn" },
-	{ "bmg160" },
-	{}
+static const struct smi_node bsg1160_data = {
+	.instances = {
+		{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+		{ "bmc150_magn" },
+		{ "bmg160" },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
-static const struct smi_instance bsg2150_data[]  = {
-	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
-	{ "bmc150_magn" },
-	/* The resources describe a 3th client, but it is not really there. */
-	{ "bsg2150_dummy_dev" },
-	{}
+static const struct smi_node bsg2150_data = {
+	.instances = {
+		{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+		{ "bmc150_magn" },
+		/* The resources describe a 3th client, but it is not really there. */
+		{ "bsg2150_dummy_dev" },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
-static const struct smi_instance int3515_data[]  = {
-	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
-	{}
+static const struct smi_node int3515_data = {
+	.instances = {
+		{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
 /*

@@ -187,9 +313,9 @@ static const struct smi_instance int3515_data[]  = {
  * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
  */
 static const struct acpi_device_id smi_acpi_ids[] = {
-	{ "BSG1160", (unsigned long)bsg1160_data },
-	{ "BSG2150", (unsigned long)bsg2150_data },
-	{ "INT3515", (unsigned long)int3515_data },
+	{ "BSG1160", (unsigned long)&bsg1160_data },
+	{ "BSG2150", (unsigned long)&bsg2150_data },
+	{ "INT3515", (unsigned long)&int3515_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, smi_acpi_ids);

Hi,

Quoted 201 lines · Stefan Binding

Add support for spi bus in serial-multi-instantiate driver

Some peripherals can have either a I2C or a SPI connection to the host (but not both) but use the same HID for both types. So it is not possible to use the HID to determine whether it is I2C or SPI. The driver must check the node to see if it contains I2cSerialBus or SpiSerialBus entries.

For backwards-compatibility with the existing nodes I2C is checked first and if such entries are found ONLY I2C devices are created. Since some existing nodes that were already handled by this driver could also contain unrelated SpiSerialBus nodes that were previously ignored, and this preserves that behavior. If there is ever a need to handle a node where both I2C and SPI devices must be instantiated this can be added in future.

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/platform/x86/Kconfig                  |   2 +-
 .../platform/x86/serial-multi-instantiate.c   | 174 +++++++++++++++---
 2 files changed, 151 insertions(+), 25 deletions(-)

drivers/platform/x86/Kconfig +1 -1

index 2e656909a866..8d1eec208854 100644
@@ -992,7 +992,7 @@ config TOPSTAR_LAPTOP
 
 config SERIAL_MULTI_INSTANTIATE
 	tristate "Serial bus multi instantiate pseudo device driver"
-	depends on I2C && ACPI
+	depends on I2C && SPI && ACPI
 	help
 	  Some ACPI-based systems list multiple devices in a single ACPI
 	  firmware-node. This driver will instantiate separate clients

drivers/platform/x86/serial-multi-instantiate.c +108 -4

index 4cd6d72a0741..3f05385ca2cf 100644
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/spi/spi.h>
 #include <linux/types.h>
 
 #define IRQ_RESOURCE_TYPE	GENMASK(1, 0)

@@ -21,15 +22,28 @@
 #define IRQ_RESOURCE_GPIO	1
 #define IRQ_RESOURCE_APIC	2
 
+enum smi_bus_type {
+	SMI_I2C,
+	SMI_SPI,
+	SMI_AUTO_DETECT,
+};
+
 struct smi_instance {
 	const char *type;
 	unsigned int flags;
 	int irq_idx;
 };
 
+struct smi_node {
+	enum smi_bus_type bus_type;
+	struct smi_instance instances[];
+};
+
 struct smi {
 	int i2c_num;
+	int spi_num;
 	struct i2c_client **i2c_devs;
+	struct spi_device **spi_devs;
 };
 
 static int smi_get_irq(struct platform_device *pdev, struct acpi_device *adev,

@@ -59,6 +73,95 @@ static void smi_devs_unregister(struct smi *smi)
 {
 	while (smi->i2c_num > 0)
 		i2c_unregister_device(smi->i2c_devs[--smi->i2c_num]);
+
+	while (smi->spi_num > 0)
+		spi_unregister_device(smi->spi_devs[--smi->spi_num]);
+}
+
+/**
+ * smi_spi_probe - Instantiate multiple SPI devices from inst array
+ * @pdev:	Platform device
+ * @adev:	ACPI device
+ * @smi:	Internal struct for Serial multi instantiate driver
+ * @inst_array:	Array of instances to probe
+ *
+ * Returns the number of SPI devices instantiate, Zero if none is found or a negative error code.
+ */
+static int smi_spi_probe(struct platform_device *pdev, struct acpi_device *adev, struct smi *smi,
+			 const struct smi_instance *inst_array)
+{
+	struct device *dev = &pdev->dev;
+	struct spi_controller *ctlr;
+	struct spi_device *spi_dev;
+	char name[50];
+	int i, ret, count;
+
+	ret = acpi_spi_count_resources(adev);
+	if (ret < 0)
+		return ret;
+	else if (!ret)
+		return -ENODEV;
+
+	count = ret;
+
+	smi->spi_devs = devm_kcalloc(dev, count, sizeof(*smi->spi_devs), GFP_KERNEL);
+	if (!smi->spi_devs)
+		return -ENOMEM;
+
+	for (i = 0; i < count && inst_array[i].type; i++) {
+
+		spi_dev = acpi_spi_device_alloc(NULL, adev, i);
+		if (IS_ERR(spi_dev)) {
+			ret = PTR_ERR(spi_dev);
+			dev_err_probe(dev, ret, "failed to allocate SPI device %s from ACPI: %d\n",
+				      dev_name(&adev->dev), ret);
+			goto error;
+		}
+
+		ctlr = spi_dev->controller;
+
+		strscpy(spi_dev->modalias, inst_array[i].type, sizeof(spi_dev->modalias));
+
+		ret = smi_get_irq(pdev, adev, &inst_array[i]);
+		if (ret < 0) {
+			spi_dev_put(spi_dev);
+			goto error;
+		}
+		spi_dev->irq = ret;
+
+		snprintf(name, sizeof(name), "%s-%s-%s.%d", dev_name(&ctlr->dev), dev_name(dev),
+			 inst_array[i].type, i);
+		spi_dev->dev.init_name = name;
+
+		ret = spi_add_device(spi_dev);
+		if (ret) {
+			dev_err_probe(&ctlr->dev, ret,
+				      "failed to add SPI device %s from ACPI: %d\n",
+				      dev_name(&adev->dev), ret);
+			spi_dev_put(spi_dev);
+			goto error;
+		}
+
+		dev_dbg(dev, "SPI device %s using chip select %u", name, spi_dev->chip_select);
+
+		smi->spi_devs[i] = spi_dev;
+		smi->spi_num++;
+	}
+
+	if (smi->spi_num < count) {
+		dev_dbg(dev, "Error finding driver, idx %d\n", i);
+		ret = -ENODEV;
+		goto error;
+	}
+
+	dev_info(dev, "Instantiated %d SPI devices.\n", smi->spi_num);
+
+	return 0;
+error:
+	smi_devs_unregister(smi);
+
+	return ret;
+
 }
 
 /**

@@ -126,8 +229,8 @@ static int smi_i2c_probe(struct platform_device *pdev, struct acpi_device *adev,
 
 static int smi_probe(struct platform_device *pdev)
 {
-	const struct smi_instance *inst_array;
 	struct device *dev = &pdev->dev;
+	const struct smi_node *node;
 	struct acpi_device *adev;
 	struct smi *smi;
 

@@ -135,8 +238,8 @@ static int smi_probe(struct platform_device *pdev)
 	if (!adev)
 		return -ENODEV;
 
-	inst_array = device_get_match_data(dev);
-	if (!inst_array) {
+	node = device_get_match_data(dev);
+	if (!node) {
 		dev_dbg(dev, "Error ACPI match data is missing\n");
 		return -ENODEV;
 	}

@@ -147,7 +250,21 @@ static int smi_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, smi);
 
-	return smi_i2c_probe(pdev, adev, smi, inst_array);
+	switch (node->bus_type) {
+	case SMI_I2C:

drivers/platform/x86/serial-multi-instantiate.c static int smi_probe(struct platform_device *pdev) · line 264

Quoted 10 lines

drivers/platform/x86/serial-multi-instantiate.c +10 -0

+		return smi_i2c_probe(pdev, adev, smi, node->instances);
+	case SMI_SPI:
+		return smi_spi_probe(pdev, adev, smi, node->instances);
+	case SMI_AUTO_DETECT:
+		if (i2c_acpi_client_count(adev) > 0)
+			return smi_i2c_probe(pdev, adev, smi, node->instances);
+		else
+			return smi_spi_probe(pdev, adev, smi, node->instances);
+	default:
+		break;

Please replace this break with : "return -EINVAL" (since we really should never hit this default case).

With that fixed, please add my R-b to the next version:

Reviewed-by Hans de Goede <[email protected]>

Regards,

Hans

Quoted 74 lines

drivers/platform/x86/serial-multi-instantiate.c +32 -20

+	}
+
+	return 0; /* never reached */
 }
 
 static int smi_remove(struct platform_device *pdev)

@@ -159,27 +276,36 @@ static int smi_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct smi_instance bsg1160_data[]  = {
-	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
-	{ "bmc150_magn" },
-	{ "bmg160" },
-	{}
+static const struct smi_node bsg1160_data = {
+	.instances = {
+		{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+		{ "bmc150_magn" },
+		{ "bmg160" },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
-static const struct smi_instance bsg2150_data[]  = {
-	{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
-	{ "bmc150_magn" },
-	/* The resources describe a 3th client, but it is not really there. */
-	{ "bsg2150_dummy_dev" },
-	{}
+static const struct smi_node bsg2150_data = {
+	.instances = {
+		{ "bmc150_accel", IRQ_RESOURCE_GPIO, 0 },
+		{ "bmc150_magn" },
+		/* The resources describe a 3th client, but it is not really there. */
+		{ "bsg2150_dummy_dev" },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
-static const struct smi_instance int3515_data[]  = {
-	{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
-	{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
-	{}
+static const struct smi_node int3515_data = {
+	.instances = {
+		{ "tps6598x", IRQ_RESOURCE_APIC, 0 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 1 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 2 },
+		{ "tps6598x", IRQ_RESOURCE_APIC, 3 },
+		{}
+	},
+	.bus_type = SMI_I2C,
 };
 
 /*

@@ -187,9 +313,9 @@ static const struct smi_instance int3515_data[]  = {
  * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().
  */
 static const struct acpi_device_id smi_acpi_ids[] = {
-	{ "BSG1160", (unsigned long)bsg1160_data },
-	{ "BSG2150", (unsigned long)bsg2150_data },
-	{ "INT3515", (unsigned long)int3515_data },
+	{ "BSG1160", (unsigned long)&bsg1160_data },
+	{ "BSG2150", (unsigned long)&bsg2150_data },
+	{ "INT3515", (unsigned long)&int3515_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, smi_acpi_ids);

From: Lucas Tanure <[email protected]>

Add support for two and four CS35L41 using the component binding method

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

Quoted 6 lines · Stefan Binding

From: Lucas Tanure <[email protected]>

Add support for two and four CS35L41 using the component binding method

Quoted 2 lines

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

Reviewed-by Takashi Iwai <[email protected]>

Hans, feel free to include this one into your tree.

Hi,

Quoted 11 lines · Takashi Iwai

Quoted 8 lines · Stefan Binding

From: Lucas Tanure <[email protected]>

Add support for two and four CS35L41 using the component binding method

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

Quoted 3 lines

Reviewed-by Takashi Iwai <[email protected]>

Hans, feel free to include this one into your tree.

Ok, I'm working on merging the entire series (on top of Mark's spi-acpi-helpers tag) now. I'll send you a pull-req for a signed tag when I'm done, in case you want to merge this to avoid conflicts.

From: Lucas Tanure <[email protected]>

The ACPI device with CSC3551 or CLSA0100 are sound cards with multiple instances of CS35L41 connected by I2C or SPI to the main CPU.

We add an ID to the ignore_serial_bus_ids list to enumerate all I2C or SPI devices correctly.

The same IDs are also added into serial-multi-instantiate so that the driver can correctly enumerate the ACPI.

Signed-off-by Lucas Tanure <[email protected]>

Signed-off-by Stefan Binding <[email protected]>

---
 drivers/acpi/scan.c                             |  3 +++
 drivers/platform/x86/serial-multi-instantiate.c | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

drivers/acpi/scan.c +3 -0

index 48db5e80c2dc..ebd10af3ff7f 100644
@@ -1744,8 +1744,11 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 	 */
 		{"BSG1160", },
 		{"BSG2150", },
+		{"CSC3551", },
 		{"INT33FE", },
 		{"INT3515", },
+	/* Non-conforming _HID for Cirrus Logic already released */
+		{"CLSA0100", },
 	/*
 	 * HIDs of device with an UartSerialBusV2 resource for which userspace
 	 * expects a regular tty cdev to be created (instead of the in kernel

drivers/platform/x86/serial-multi-instantiate.c +14 -0

index 3f05385ca2cf..d09f11eac4f8 100644
@@ -308,6 +308,17 @@ static const struct smi_node int3515_data = {
 	.bus_type = SMI_I2C,
 };
 
+static const struct smi_node cs35l41_hda = {
+	.instances = {
+		{ "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 },
+		{ "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 },
+		{ "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 },
+		{ "cs35l41-hda", IRQ_RESOURCE_GPIO, 0 },
+		{}
+	},
+	.bus_type = SMI_AUTO_DETECT,
+};
+
 /*
  * Note new device-ids must also be added to serial_multi_instantiate_ids in
  * drivers/acpi/scan.c: acpi_device_enumeration_by_parent().

@@ -316,6 +327,9 @@ static const struct acpi_device_id smi_acpi_ids[] = {
 	{ "BSG1160", (unsigned long)&bsg1160_data },
 	{ "BSG2150", (unsigned long)&bsg2150_data },
 	{ "INT3515", (unsigned long)&int3515_data },
+	{ "CSC3551", (unsigned long)&cs35l41_hda },
+	/* Non-conforming _HID for Cirrus Logic already released */
+	{ "CLSA0100", (unsigned long)&cs35l41_hda },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, smi_acpi_ids);

Add support for SPI bus in the i2c-multi-instantiate driver as upcoming laptops will need to multi instantiate SPI devices from a single device node, which has multiple SpiSerialBus entries at the ACPI table.

With the new SPI support, i2c-multi-instantiate becomes bus-multi-instantiate and is moved to the ACPI folder.

The intention is to support the SPI bus by re-using the current I2C multi instantiate, instead of creating a new SPI multi instantiate, to make it possible for peripherals that can be controlled by I2C or SPI to have the same HID at the ACPI table.

The new driver (serial multi instantiate, smi) checks for the hard-coded bus type and returns -ENODEV in case of zero devices found for that bus. In the case of automatic bus detection, the driver will give preference to I2C.

The expectation is for a device node in the ACPI table to have multiple I2cSerialBus only or multiple SpiSerialBus only, not a mix of both; and for the case where there are both entries in one device node, only the I2C ones would be probed.

This new serial multi instantiate will be used in CS35L41 HDA new driver.

Changes since V5:
- comment, commit message and Kconfig description fixes
- minor fixes in serial-multi-instantiate
- use lowercase for SSIDs in patch_realtek.c

Lucas Tanure (4):
platform/x86: i2c-multi-instantiate: Rename it for a generic serial
driver name
platform/x86: serial-multi-instantiate: Reorganize I2C functions
ALSA: hda/realtek: Add support for HP Laptops
ACPI / scan: Create platform device for CS35L41

Stefan Binding (5):
spi: Make spi_alloc_device and spi_add_device public again
spi: Create helper API to lookup ACPI info for spi device
spi: Support selection of the index of the ACPI Spi Resource before
alloc
spi: Add API to count spi acpi resources
platform/x86: serial-multi-instantiate: Add SPI support

 MAINTAINERS                                   |   4 +-
 drivers/acpi/scan.c                           |  16 +-
 drivers/platform/x86/Kconfig                  |  12 +-
 drivers/platform/x86/Makefile                 |   2 +-
 drivers/platform/x86/i2c-multi-instantiate.c  | 174 ---------
 .../platform/x86/serial-multi-instantiate.c   | 349 ++++++++++++++++++
 drivers/spi/spi.c                             | 137 ++++++-
 include/linux/spi/spi.h                       |  20 +
 sound/pci/hda/patch_realtek.c                 |  43 ++-
 9 files changed, 551 insertions(+), 206 deletions(-)
 delete mode 100644 drivers/platform/x86/i2c-multi-instantiate.c
 create mode 100644 drivers/platform/x86/serial-multi-instantiate.c

Add support for SPI bus in the i2c-multi-instantiate driver as upcoming laptops will need to multi instantiate SPI devices from a single device node, which has multiple SpiSerialBus entries at the ACPI table.

With the new SPI support, i2c-multi-instantiate becomes bus-multi-instantiate and is moved to the ACPI folder.

[...]

Add support for SPI bus in the i2c-multi-instantiate driver as upcoming laptops will need to multi instantiate SPI devices from a single device node, which has multiple SpiSerialBus entries at the ACPI table.