drivers: new helper for ioremapping memory resources

PATCH In review Bartosz Golaszewski 4 participants 9 messages Feb 20, 2019 – Feb 21, 2019

Subsystems (3)

GPIO Driver core TI DaVinci series GPIO driver

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Bartosz Golaszewski

author

2019-02-20 11:12 UTC #0 lore raw

v2 cover drivers: new helper for ioremapping memory resources

From: Bartosz Golaszewski <[email protected]>

There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree. It's a minor redundancy, but consolidation is always good.

The first patch in this series adds a wrapper for these two calls and the second uses it in a driver I could test.

If accepted I'll prepare a coccinelle script that'll make it easier to convert all users.

v1 -> v2:
- EXPORT_SYMBOL() -> EXPORT_SYMBOL_GPL()

Bartosz Golaszewski (2):
drivers: provide devm_platform_ioremap_resource()
gpio: davinci: use devm_platform_ioremap_resource()

 drivers/base/platform.c         | 18 ++++++++++++++++++
 drivers/gpio/gpio-davinci.c     |  4 +---
 include/linux/platform_device.h |  3 +++
 3 files changed, 22 insertions(+), 3 deletions(-)

Signature · 1 line

2.20.1

Bartosz Golaszewski

author

2019-02-20 11:12 UTC #1 lore raw

PATCH v2 1/2 drivers: provide devm_platform_ioremap_resource()

From: Bartosz Golaszewski <[email protected]>

There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree.

This patch wraps these two calls in a single helper. Thanks to that we don't have to declare a local variable for struct resource * and can omit the redundant argument for resource type. We also have one function call less.

Signed-off-by Bartosz Golaszewski <[email protected]>

---
 drivers/base/platform.c         | 18 ++++++++++++++++++
 include/linux/platform_device.h |  3 +++
 2 files changed, 21 insertions(+)

drivers/base/platform.c +18 -0

index 1c958eb33ef4..f82691e1c26c 100644
@@ -79,6 +79,24 @@ struct resource *platform_get_resource(struct platform_device *dev,
 }
 EXPORT_SYMBOL_GPL(platform_get_resource);
 
+/**
+ * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
+ *				    device
+ *
+ * @pdev: platform device to use both for memory resource lookup as well as
+ *        resource managemend
+ * @index: resource index
+ */
+void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
+					     unsigned int index)
+{
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, index);
+	return devm_ioremap_resource(&pdev->dev, res);
+}
+EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
+
 /**
  * platform_get_irq - get an IRQ for a device
  * @dev: platform device

include/linux/platform_device.h +3 -0

index c7c081dc6034..b126b73ed8ef 100644
@@ -52,6 +52,9 @@ extern struct device platform_bus;
 extern void arch_setup_pdev_archdata(struct platform_device *);
 extern struct resource *platform_get_resource(struct platform_device *,
 					      unsigned int, unsigned int);
+extern void __iomem *
+devm_platform_ioremap_resource(struct platform_device *pdev,
+			       unsigned int index);
 extern int platform_get_irq(struct platform_device *, unsigned int);
 extern int platform_irq_count(struct platform_device *);
 extern struct resource *platform_get_resource_byname(struct platform_device *,

Signature · 1 line

2.20.1

Bartosz Golaszewski

author

2019-02-20 11:12 UTC #7 lore raw

PATCH v2 2/2 gpio: davinci: use devm_platform_ioremap_resource()

In reply to Bartosz Golaszewski

From: Bartosz Golaszewski <[email protected]>

Use the new helper that wraps the calls to platform_get_resource() and devm_ioremap_resource() together.

Signed-off-by Bartosz Golaszewski <[email protected]>

---
 drivers/gpio/gpio-davinci.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

drivers/gpio/gpio-davinci.c +1 -3

index bdb29e51b417..188b8e5c8e67 100644
@@ -198,7 +198,6 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	struct davinci_gpio_controller *chips;
 	struct davinci_gpio_platform_data *pdata;
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 
 	pdata = davinci_gpio_get_pdata(pdev);
 	if (!pdata) {

@@ -236,8 +235,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	if (!chips)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	gpio_base = devm_ioremap_resource(dev, res);
+	gpio_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(gpio_base))
 		return PTR_ERR(gpio_base);

Signature · 1 line

2.20.1

Greg Kroah-Hartman

maintainer Acked-by on v2 1/2

2019-02-20 11:16 UTC #2 lore raw

Re: [PATCH v2 1/2] drivers: provide devm_platform_ioremap_resource()

In reply to Bartosz Golaszewski

Quoted 11 lines · Bartosz Golaszewski

From: Bartosz Golaszewski <[email protected]>
There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree.
This patch wraps these two calls in a single helper. Thanks to that we don't have to declare a local variable for struct resource * and can omit the redundant argument for resource type. We also have one function call less.
Signed-off-by Bartosz Golaszewski <[email protected]>

Acked-by Greg Kroah-Hartman <[email protected]>

Bartosz Golaszewski

author

2019-02-20 11:21 UTC #3 lore raw

Re: [PATCH v2 1/2] drivers: provide devm_platform_ioremap_resource()

śr., 20 lut 2019 o 12:16 Greg Kroah-Hartman
<[email protected]> napisał(a):

Quoted 7 lines · Bartosz Golaszewski

Quoted 5 lines
From: Bartosz Golaszewski <[email protected]>
There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree.

Quoted 9 lines

Quoted 6 lines
This patch wraps these two calls in a single helper. Thanks to that we don't have to declare a local variable for struct resource * and can omit the redundant argument for resource type. We also have one function call less.
Signed-off-by Bartosz Golaszewski <[email protected]>
Acked-by Greg Kroah-Hartman <[email protected]>

Should this go through the driver-core tree?

Bart

Andy Shevchenko

Reviewed-by on the v2 series

2019-02-20 12:04 UTC #8 lore raw

In reply to Bartosz Golaszewski

Quoted 6 lines · Bartosz Golaszewski

From: Bartosz Golaszewski <[email protected]>
There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree. It's a minor redundancy, but consolidation is always good.

Quoted 6 lines

The first patch in this series adds a wrapper for these two calls and the second uses it in a driver I could test.
If accepted I'll prepare a coccinelle script that'll make it easier to convert all users.

Reviewed-by Andy Shevchenko <[email protected]>

Quoted 15 lines

v1 -> v2:
- EXPORT_SYMBOL() -> EXPORT_SYMBOL_GPL()
Bartosz Golaszewski (2):
drivers: provide devm_platform_ioremap_resource()
gpio: davinci: use devm_platform_ioremap_resource()
 drivers/base/platform.c         | 18 ++++++++++++++++++
 drivers/gpio/gpio-davinci.c     |  4 +---
 include/linux/platform_device.h |  3 +++
 3 files changed, 22 insertions(+), 3 deletions(-)
Signature · 1 line
2.20.1

Signature · 2 lines

With Best Regards,
Andy Shevchenko

Greg Kroah-Hartman

maintainer

2019-02-20 12:15 UTC #4 lore raw

Re: [PATCH v2 1/2] drivers: provide devm_platform_ioremap_resource()

In reply to Bartosz Golaszewski

Quoted 14 lines · Bartosz Golaszewski

śr., 20 lut 2019 o 12:16 Greg Kroah-Hartman
<[email protected]> napisał(a):
Quoted 12 lines · Bartosz Golaszewski
Quoted 10 lines
From: Bartosz Golaszewski <[email protected]>
There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree.
This patch wraps these two calls in a single helper. Thanks to that we don't have to declare a local variable for struct resource * and can omit the redundant argument for resource type. We also have one function call less.

Quoted 6 lines

Quoted 4 lines
Quoted 1 line
Signed-off-by Bartosz Golaszewski <[email protected]>
Acked-by Greg Kroah-Hartman <[email protected]>
Should this go through the driver-core tree?

No need, put it through the tree for patch 2/2.

thanks,

greg k-h

Bartosz Golaszewski

author

2019-02-21 09:53 UTC #5 lore raw

Re: [PATCH v2 1/2] drivers: provide devm_platform_ioremap_resource()

śr., 20 lut 2019 o 13:15 Greg Kroah-Hartman
<[email protected]> napisał(a):

Quoted 21 lines · Bartosz Golaszewski

Quoted 19 lines
śr., 20 lut 2019 o 12:16 Greg Kroah-Hartman
<[email protected]> napisał(a):
Quoted 16 lines · Bartosz Golaszewski
Quoted 11 lines
From: Bartosz Golaszewski <[email protected]>
There are currently 1200+ instances of using platform_get_resource() and devm_ioremap_resource() together in the kernel tree.
This patch wraps these two calls in a single helper. Thanks to that we don't have to declare a local variable for struct resource * and can omit the redundant argument for resource type. We also have one function call less.
Signed-off-by Bartosz Golaszewski <[email protected]>
Acked-by Greg Kroah-Hartman <[email protected]>

Quoted 7 lines

Quoted 1 line
Should this go through the driver-core tree?
No need, put it through the tree for patch 2/2.
thanks,
greg k-h

Linus,

can you take the two patches for v5.1?

Bart

Linus Walleij

2019-02-21 12:06 UTC #6 lore raw

Re: [PATCH v2 1/2] drivers: provide devm_platform_ioremap_resource()

Quoted 11 lines · Bartosz Golaszewski

Quoted 7 lines
Quoted 1 line
Should this go through the driver-core tree?
No need, put it through the tree for patch 2/2.
thanks,
greg k-h
Linus,
can you take the two patches for v5.1?

Yup both merged to the GPIO tree, thanks!

Yours,
Linus Walleij