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mbox: add polarfire soc system controller mailbox

PATCH Superseded [email protected] 3 participants 5 messages Dec 1, 2020

Subsystems (3)
RISC-V Mailbox API RISC-V Microchip support

v2 of 9 Superseded Latest is v9 →

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#0 lore raw

PATCH v2 1/5 mbox: add polarfire soc system controller mailbox

From: Conor Dooley <[email protected]>

This driver adds support for the single mailbox channel of the MSS system controller on the Microchip PolarFire SoC.

Signed-off-by Conor Dooley <[email protected]>
---
 drivers/mailbox/Kconfig        |  12 ++
 drivers/mailbox/Makefile       |   2 +
 drivers/mailbox/mailbox-mpfs.c | 285 +++++++++++++++++++++++++++++++++
 include/soc/microchip/mpfs.h   |  51 ++++++
 4 files changed, 350 insertions(+)
 create mode 100644 drivers/mailbox/mailbox-mpfs.c
 create mode 100644 include/soc/microchip/mpfs.h
drivers/mailbox/Kconfig +12 -0
index 05b1009e2820..fbf6902c3541 100644
@@ -153,6 +153,18 @@ config MAILBOX_TEST
 	  Test client to help with testing new Controller driver
 	  implementations.
 
+config MPFS_MBOX
+	tristate "MPFS Mailbox"
+	depends on HAS_IOMEM
+	depends on SOC_MICROCHIP_POLARFIRE || COMPILE_TEST
+	help
+	  This driver adds support for the Polarfire SoC mailbox controller.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called mailbox-mpfs.
+
+	  If unsure, say N.
+
 config QCOM_APCS_IPC
 	tristate "Qualcomm APCS IPC driver"
 	depends on ARCH_QCOM || COMPILE_TEST
drivers/mailbox/Makefile +2 -0
index 2e06e02b2e03..63f49b5bcc43 100644
@@ -39,6 +39,8 @@ obj-$(CONFIG_BCM_PDC_MBOX)	+= bcm-pdc-mailbox.o
 
 obj-$(CONFIG_BCM_FLEXRM_MBOX)	+= bcm-flexrm-mailbox.o
 
+obj-$(CONFIG_MPFS_MBOX)	+= mailbox-mpfs.o
+
 obj-$(CONFIG_QCOM_APCS_IPC)	+= qcom-apcs-ipc-mailbox.o
 
 obj-$(CONFIG_TEGRA_HSP_MBOX)	+= tegra-hsp.o
drivers/mailbox/mailbox-mpfs.c new file +285 -0

285 lines not on this page · raw message

include/soc/microchip/mpfs.h new file +51 -0

51 lines not on this page · raw message

Signature · 7 lines
2.17.1


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#1 lore raw
Quoted 74 lines · On 2020/12/01 20:02, [email protected] wrote:

From: Conor Dooley <[email protected]>

This driver adds support for the single mailbox channel of the MSS system controller on the Microchip PolarFire SoC.

Signed-off-by Conor Dooley <[email protected]>
---
 drivers/mailbox/Kconfig        |  12 ++
 drivers/mailbox/Makefile       |   2 +
 drivers/mailbox/mailbox-mpfs.c | 285 +++++++++++++++++++++++++++++++++
 include/soc/microchip/mpfs.h   |  51 ++++++
 4 files changed, 350 insertions(+)
 create mode 100644 drivers/mailbox/mailbox-mpfs.c
 create mode 100644 include/soc/microchip/mpfs.h
drivers/mailbox/Kconfig +12 -0
index 05b1009e2820..fbf6902c3541 100644
@@ -153,6 +153,18 @@ config MAILBOX_TEST
 	  Test client to help with testing new Controller driver
 	  implementations.
 
+config MPFS_MBOX
+	tristate "MPFS Mailbox"
+	depends on HAS_IOMEM
+	depends on SOC_MICROCHIP_POLARFIRE || COMPILE_TEST
+	help
+	  This driver adds support for the Polarfire SoC mailbox controller.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called mailbox-mpfs.
+
+	  If unsure, say N.
+
 config QCOM_APCS_IPC
 	tristate "Qualcomm APCS IPC driver"
 	depends on ARCH_QCOM || COMPILE_TEST
drivers/mailbox/Makefile +2 -0
index 2e06e02b2e03..63f49b5bcc43 100644
@@ -39,6 +39,8 @@ obj-$(CONFIG_BCM_PDC_MBOX)	+= bcm-pdc-mailbox.o
 
 obj-$(CONFIG_BCM_FLEXRM_MBOX)	+= bcm-flexrm-mailbox.o
 
+obj-$(CONFIG_MPFS_MBOX)	+= mailbox-mpfs.o
+
 obj-$(CONFIG_QCOM_APCS_IPC)	+= qcom-apcs-ipc-mailbox.o
 
 obj-$(CONFIG_TEGRA_HSP_MBOX)	+= tegra-hsp.o
drivers/mailbox/mailbox-mpfs.c new file +17 -0
new file mode 100644
index 000000000000..e1ecf3081312
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip MPFS system controller/mailbox controller driver
+ *
+ * Copyright (c) 2020 Microchip Corporation. All rights reserved.
+ *
+ * Author: Conor Dooley <[email protected]>
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>

drivers/mailbox/mailbox-mpfs.c line 27

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+#include <linux/mailbox_controller.h>
+#include <soc/microchip/mpfs.h>
+
+#define SERVICES_CR_OFFSET		0x50u
+#define SERVICES_SR_OFFSET		0x54u
+#define MAILBOX_REG_OFFSET		0x800u
+#define MSS_SYS_BUSY			-EBUSY
+#define MSS_SYS_PARAM_ERR		-EINVAL
+#define MSS_SYS_MAILBOX_DATA_OFFSET	0u
+#define SCB_MASK_WIDTH 			16u

Value identation seems off here. Aligning it would be nice.

Quoted 6 lines
drivers/mailbox/mailbox-mpfs.c new file +6 -0
+/* SCBCTRL service control register */
+
+#define SCB_CTRL_REQ (0u)
+#define SCB_CTRL_REQ_MASK BIT(SCB_CTRL_REQ)
+
+#define SCB_CTRL_BUSY (1u)

drivers/mailbox/mailbox-mpfs.c line 43

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+#define SCB_CTRL_BUSY_MASK BIT(SCB_CTRL_BUSY)
+
+#define SCB_CTRL_ABORT (2u)
+#define SCB_CTRL_ABORT_MASK BIT(SCB_CTRL_ABORT)
+
+#define SCB_CTRL_NOTIFY (3u)
+#define SCB_CTRL_NOTIFY_MASK BIT(SCB_CTRL_NOTIFY)
+
+#define SCB_CTRL_POS (16u)
+#define SCB_CTRL_MASK GENMASK(SCB_CTRL_POS+SCB_MASK_WIDTH, SCB_CTRL_POS)

Please add spaces before and after the "+" operator.

And I am really not a big fan of the (useless in my opinion) "u" for unsigned for all of these.

Quoted 7 lines
drivers/mailbox/mailbox-mpfs.c new file +7 -0
+
+/* SCBCTRL service status registers */
+
+#define SCB_STATUS_REQ (0u)
+#define SCB_STATUS_REQ_MASK BIT(SCB_STATUS_REQ)
+
+#define SCB_STATUS_BUSY (1u)

drivers/mailbox/mailbox-mpfs.c line 60

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+#define SCB_STATUS_BUSY_MASK BIT(SCB_STATUS_BUSY)
+
+#define SCB_STATUS_ABORT (2u)
+#define SCB_STATUS_ABORT_MASK BIT(SCB_STATUS_ABORT)
+
+#define SCB_STATUS_NOTIFY (3u)
+#define SCB_STATUS_NOTIFY_MASK BIT(SCB_STATUS_NOTIFY)
+
+#define SCB_STATUS_POS (16u)
+#define SCB_STATUS_MASK GENMASK(SCB_STATUS_POS+SCB_MASK_WIDTH, SCB_STATUS_POS)

Spaces around "+".

Quoted 15 lines
drivers/mailbox/mailbox-mpfs.c new file +15 -0
+
+struct mpfs_mbox {
+	struct mbox_controller controller;
+	struct device *dev;
+	int irq;
+	void __iomem *mailbox_base;
+	void __iomem *int_reg;
+	struct mbox_chan *chan;
+	u16 response_size;
+	u16 response_offset;
+};
+
+static bool mpfs_mbox_busy(struct mpfs_mbox *mbox)
+{
+	u32 status;

drivers/mailbox/mailbox-mpfs.c line 85

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+
+	status = readl_relaxed(mbox->mailbox_base + SERVICES_SR_OFFSET);
+
+	return status & SCB_STATUS_BUSY_MASK;
+}
+
+static struct mpfs_mbox *mbox_chan_to_mpfs_mbox(struct mbox_chan *chan)
+{
+	if (!chan || !chan->con_priv)
+		return NULL;

You do not need the "|| !chan->con_priv" here. The return below will return NULL.

Quoted 21 lines
drivers/mailbox/mailbox-mpfs.c new file +21 -0
+
+	return (struct mpfs_mbox *)chan->con_priv;
+}
+
+static int mpfs_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+	u32 index;
+	u32 *word_buf;
+	u8 *byte_buf;
+	u8 byte_off;
+	u8 i;
+	u32 mailbox_val = 0u;
+	u16 mb_offset;
+	u16 mbox_options_select;
+	u32 mbox_tx_trigger;
+	struct mpfs_mss_msg *msg = data;
+	struct mpfs_mbox *mbox = mbox_chan_to_mpfs_mbox(chan);
+	mb_offset = msg->mailbox_offset;
+	mbox->response_size = msg->response_size;
+	mbox->response_offset = msg->response_offset;
+

drivers/mailbox/mailbox-mpfs.c line 116

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+	if (mpfs_mbox_busy(mbox))
+		return MSS_SYS_BUSY;
+
+	mbox_options_select = ((mb_offset << 7u) | (msg->cmd_opcode & 0x7fu));
+	mbox_tx_trigger = (((mbox_options_select << SCB_CTRL_POS) &
+		SCB_CTRL_MASK) | SCB_CTRL_REQ_MASK | SCB_STATUS_NOTIFY_MASK);
+
+	/* Code for MSS_SYS_PARAM_ERR is not implemented with this version of driver. */
+
+	writel_relaxed(0x0u, mbox->int_reg);

0x0u seems like an awfully complicated way of writing 0. Less characters for the brain to decode makes reading easier :)

drivers/mailbox/mailbox-mpfs.c line 124

Quoted 8 lines
drivers/mailbox/mailbox-mpfs.c new file +8 -0
+
+	if (msg->cmd_data_size) {
+		byte_buf = (u8 *)(msg->cmd_data);
+
+		for (index = 0; index < (msg->cmd_data_size / 4); index++) {
+			writel_relaxed(word_buf[index],
+				       mbox->mailbox_base + MAILBOX_REG_OFFSET + index);
+		}

You do not need the braces here.

drivers/mailbox/mailbox-mpfs.c line 126

Quoted 2 lines
drivers/mailbox/mailbox-mpfs.c new file +2 -0
+
+		if ((msg->cmd_data_size % 4) > 0) {

s/% 4/& 3. And you do not need the "> 0".

drivers/mailbox/mailbox-mpfs.c line 127

Quoted 1 line
drivers/mailbox/mailbox-mpfs.c new file +1 -0
+			byte_off = (((msg->cmd_data_size / 4) * 4));

Extra outside parenthesis not needed.
byte_off = msg->cmd_data_size & (~3);
or
byte_off = ALIGN_DOWN(msg->cmd_data_size, 4);

drivers/mailbox/mailbox-mpfs.c line 128

Quoted 1 line
drivers/mailbox/mailbox-mpfs.c new file +1 -0
+			byte_buf = (u8 *)(msg->cmd_data + byte_off);

cmd_data is already u8 *, so you do not need the cast.

drivers/mailbox/mailbox-mpfs.c line 133

Quoted 5 lines
drivers/mailbox/mailbox-mpfs.c new file +5 -0
+
+			mailbox_val = readl_relaxed(mbox->mailbox_base +
+					    MAILBOX_REG_OFFSET + index);
+
+			for (i = 0u; i < (msg->cmd_data_size % 4u); i++) {

% 4 -> & 3
And since you already have taht in the if above, why not use a local variable ?

Quoted 26 lines
drivers/mailbox/mailbox-mpfs.c new file +26 -0
+				mailbox_val &= ~(0xffu << (i * 8u));
+				mailbox_val |= (byte_buf[i] << (i * 8u));
+			}
+
+			writel_relaxed(mailbox_val, mbox->mailbox_base + MAILBOX_REG_OFFSET + index);
+		}
+	}
+
+	writel_relaxed(mbox_tx_trigger, mbox->mailbox_base + SERVICES_CR_OFFSET);
+
+	return 0;
+}
+
+static inline bool mpfs_mbox_pending(struct mpfs_mbox *mbox)
+{
+	u32 status;
+
+	status = readl_relaxed(mbox->mailbox_base + SERVICES_SR_OFFSET);
+
+	return !(status & SCB_STATUS_BUSY_MASK);
+}
+
+static void mpfs_mbox_rx_data(struct mbox_chan *chan)
+{
+	struct mpfs_mbox *mbox = mbox_chan_to_mpfs_mbox(chan);
+	u32 *data;

drivers/mailbox/mailbox-mpfs.c line 169

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+	u32 i;
+	u32 response_limit;
+
+	data = devm_kzalloc(mbox->dev, sizeof(*data) * mbox->response_size, GFP_ATOMIC);
+	if (!data)
+		dev_err(mbox->dev, "failed to register mailbox interrupt:%d\n", -ENOMEM);
+
+	response_limit = (mbox->response_size) + (mbox->response_offset);
+	if (mpfs_mbox_pending(mbox) && mbox->response_size > 0U) {
+		for (i = (mbox->response_offset); i < response_limit; i++) {

Parenthesis not needed around (mbox->response_offset).

drivers/mailbox/mailbox-mpfs.c line 170

Quoted 1 line
drivers/mailbox/mailbox-mpfs.c new file +1 -0
+			data[i - (mbox->response_offset)] =

Same here.

Quoted 4 lines
drivers/mailbox/mailbox-mpfs.c new file +4 -0
+				readl_relaxed(mbox->mailbox_base + MAILBOX_REG_OFFSET + i * 0x4);
+		}
+	}
+

drivers/mailbox/mailbox-mpfs.c line 184

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+	mbox_chan_received_data(chan, (void *)data);
+	devm_kfree(mbox->dev, data);
+}
+
+static irqreturn_t mpfs_mbox_inbox_isr(int irq, void *data)
+{
+	struct mbox_chan *chan = (struct mbox_chan *)data;
+	struct mpfs_mbox *mbox = mbox_chan_to_mpfs_mbox(chan);
+
+	writel_relaxed(0x0U, mbox->int_reg);

0x0U == 0...

Quoted 8 lines
drivers/mailbox/mailbox-mpfs.c new file +8 -0
+
+	mpfs_mbox_rx_data(chan);
+
+	mbox_chan_txdone(chan, 0);
+	return IRQ_HANDLED;
+}
+
+static int mpfs_mbox_startup(struct mbox_chan *chan)

drivers/mailbox/mailbox-mpfs.c line 202

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+{
+	struct mpfs_mbox *mbox = mbox_chan_to_mpfs_mbox(chan);
+	int ret = 0;
+
+	if (!mbox)
+		return -EINVAL;
+	ret = devm_request_irq(mbox->dev, mbox->irq, mpfs_mbox_inbox_isr, 0, "mpfs-mailbox", chan);
+	if (ret) {
+		dev_err(mbox->dev, "failed to register mailbox interrupt:%d\n", ret);
+	}

No need for the curly braces.

Quoted 59 lines
drivers/mailbox/mailbox-mpfs.c new file +59 -0
+
+	return ret;
+}
+
+static void mpfs_mbox_shutdown(struct mbox_chan *chan)
+{
+	struct mpfs_mbox *mbox = mbox_chan_to_mpfs_mbox(chan);
+
+	devm_free_irq(mbox->dev, mbox->irq, chan);
+}
+
+static const struct mbox_chan_ops mpfs_mbox_ops = {
+	.send_data = mpfs_mbox_send_data,
+	.startup = mpfs_mbox_startup,
+	.shutdown = mpfs_mbox_shutdown,
+};
+
+static int mpfs_mbox_probe(struct platform_device *pdev)
+{
+	struct mpfs_mbox *mbox;
+	struct resource *regs;
+	struct mbox_chan *chans;
+	int ret;
+
+	mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox), GFP_KERNEL);
+	if (!mbox)
+		return -ENOMEM;
+
+	chans = devm_kzalloc(&pdev->dev, sizeof(*chans), GFP_KERNEL);
+	if (!chans)
+		return -ENOMEM;
+
+	mbox->mailbox_base = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);
+	if (IS_ERR(mbox->mailbox_base))
+		return PTR_ERR(mbox->mailbox_base);
+
+	mbox->int_reg = devm_platform_get_and_ioremap_resource(pdev, 1, &regs);
+	if (IS_ERR(mbox->int_reg))
+		return PTR_ERR(mbox->int_reg);
+
+	mbox->irq = platform_get_irq(pdev, 0);
+	if (mbox->irq < 0)
+		return mbox->irq;
+
+	mbox->dev = &pdev->dev;
+
+	chans[0].con_priv = mbox;
+	mbox->controller.dev = mbox->dev;
+	mbox->controller.num_chans = 1;
+	mbox->controller.chans = chans;
+	mbox->controller.ops = &mpfs_mbox_ops;
+	mbox->controller.txdone_irq = true;
+
+	ret = devm_mbox_controller_register(&pdev->dev, &mbox->controller);
+	if (ret) {
+		dev_err(&pdev->dev, "Registering MPFS mailbox controller failed\n");
+		return ret;
+	}
+	dev_info(&pdev->dev, "Registered MPFS mailbox controller driver\n");

drivers/mailbox/mailbox-mpfs.c line 271

Quoted 10 lines
drivers/mailbox/mailbox-mpfs.c new file +10 -0
+
+	return 0;
+}
+
+static const struct of_device_id mpfs_mbox_of_match[] = {
+	{
+		.compatible = "microchip,polarfire-soc-mailbox",
+	},
+	{},
+};

The typical way of writing this is:

static const struct of_device_id mpfs_mbox_of_match[] = {
	{ .compatible = "microchip,polarfire-soc-mailbox", },
	{}
};
Quoted 39 lines
drivers/mailbox/mailbox-mpfs.c new file +14 -0
+MODULE_DEVICE_TABLE(of, mpfs_mbox_of_match);
+
+static struct platform_driver mpfs_mbox_driver = {
+	.driver = {
+		.name = "mpfs-mailbox",
+		.of_match_table = mpfs_mbox_of_match,
+	},
+	.probe = mpfs_mbox_probe,
+};
+module_platform_driver(mpfs_mbox_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Conor Dooley <[email protected]>");
+MODULE_DESCRIPTION("MPFS mailbox controller driver");
include/soc/microchip/mpfs.h new file +19 -0
new file mode 100644
index 000000000000..b231f39f32eb
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *
+ * Microchip MPFS mailbox
+ *
+ * Copyright (c) 2020 Microchip Corporation. All rights reserved.
+ *
+ * Author: Conor Dooley <[email protected]>
+ *
+ */
+
+#ifndef __SOC_MPFS_H__
+#define __SOC_MPFS_H__
+
+#include <linux/types.h>
+#include <linux/of_device.h>
+
+struct mpfs_sys_controller;
+

include/soc/microchip/mpfs.h line 29

Quoted 10 lines
include/soc/microchip/mpfs.h new file +10 -0
+struct mpfs_mss_msg {
+	u8 cmd_opcode;
+	u16 cmd_data_size;
+	u16 response_size;
+	u8 *cmd_data;
+	u16 mailbox_offset;
+	u16 response_offset;
+};
+
+#if IS_ENABLED(CONFIG_MPFS_SYS_CONTROLLER)

A simple #ifdef would do.

Quoted 23 lines
include/soc/microchip/mpfs.h new file +22 -0
+
+int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, void *msg,
+			      void *response, u16 response_size_bytes);
+
+struct mpfs_sys_controller *mpfs_sys_controller_get(struct device_node *mailbox_node);
+
+#else
+
+static int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, void *msg,
+				     void *response, u16 response_size_bytes)
+{
+	return -ENOSYS;
+};
+
+struct mpfs_sys_controller *mpfs_sys_controller_get(struct device_node *mailbox_node)
+{
+	return NULL;
+}
+
+#endif /* IS_ENABLED(CONFIG_MPFS_SYS_CONTROLLER) */
+
+#endif /* __SOC_MPFS_H__ */
Signature · 7 lines
Damien Le Moal
Western Digital Research

_______________________________________________
linux-riscv mailing list
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author maintainer
#2 lore raw
Quoted 17 lines · Damien Le Moal

EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe

Quoted 14 lines · On 2020/12/01 20:02, [email protected] wrote:

From: Conor Dooley <[email protected]>

This driver adds support for the single mailbox channel of the MSS system controller on the Microchip PolarFire SoC.

Signed-off-by Conor Dooley <[email protected]>
---
 drivers/mailbox/Kconfig        |  12 ++
 drivers/mailbox/Makefile       |   2 +
 drivers/mailbox/mailbox-mpfs.c | 285 +++++++++++++++++++++++++++++++++
 include/soc/microchip/mpfs.h   |  51 ++++++
 4 files changed, 350 insertions(+)
 create mode 100644 drivers/mailbox/mailbox-mpfs.c
 create mode 100644 include/soc/microchip/mpfs.h

(trimmed)

Quoted 26 lines
Quoted 26 lines
drivers/mailbox/mailbox-mpfs.c new file +20 -0
new file mode 100644
index 000000000000..e1ecf3081312
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip MPFS system controller/mailbox controller driver
+ *
+ * Copyright (c) 2020 Microchip Corporation. All rights reserved.
+ *
+ * Author: Conor Dooley <[email protected]>
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/mailbox_controller.h>
+#include <soc/microchip/mpfs.h>
+
Quoted 8 lines

drivers/mailbox/mailbox-mpfs.c line 27

Quoted 7 lines
drivers/mailbox/mailbox-mpfs.c new file +7 -0
+#define SERVICES_CR_OFFSET           0x50u
+#define SERVICES_SR_OFFSET           0x54u
+#define MAILBOX_REG_OFFSET           0x800u
+#define MSS_SYS_BUSY                 -EBUSY
+#define MSS_SYS_PARAM_ERR            -EINVAL
+#define MSS_SYS_MAILBOX_DATA_OFFSET  0u
+#define SCB_MASK_WIDTH                       16u

Value identation seems off here. Aligning it would be nice.

Not really sure why thats off, its off in my mail client too but it's aligned when I apply the patch from the original text file, or if I git am the emailed patch.

I'll address the other comments in the next version.

Quoted 3 lines

--
Damien Le Moal
Western Digital Research

_______________________________________________
linux-riscv mailing list
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#3 lore raw
In reply to [email protected]
Quoted 4 lines · On Tue, Dec 01, 2020 at 11:02:42AM +0000, [email protected] wrote:

From: Conor Dooley <[email protected]>

This driver adds support for the single mailbox channel of the MSS system controller on the Microchip PolarFire SoC.

Out of my curiosity: What is MSS? Is it the Microprocessor Subsystem in the SoC?

(It isn't quite clear from the PolarFire documentation I could find)

Quoted 3 lines
Signed-off-by Conor Dooley <[email protected]>

---

[...]

drivers/mailbox/Kconfig config MAILBOX_TEST · line 157

Quoted 2 lines
drivers/mailbox/Kconfig +2 -0
+config MPFS_MBOX
+	tristate "MPFS Mailbox"

"MPFS" in the title seems (to me) a bit too obscure for the uninitiated. Perhaps you could use something slightly longer that mentions Microchip and/or the PolarFire series?

drivers/mailbox/mailbox-mpfs.c line 3

Quoted 5 lines

+++ b/drivers/mailbox/mailbox-mpfs.c

drivers/mailbox/mailbox-mpfs.c new file +3 -0
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip MPFS system controller/mailbox controller driver

The same might apply here.

Best regards,
Jonathan Neuschäfer

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#4 lore raw
Quoted 11 lines · Jonathan Neuschäfer

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Quoted 4 lines · On Tue, Dec 01, 2020 at 11:02:42AM +0000, [email protected] wrote:

From: Conor Dooley <[email protected]>

This driver adds support for the single mailbox channel of the MSS system controller on the Microchip PolarFire SoC.

Out of my curiosity: What is MSS? Is it the Microprocessor Subsystem in the SoC?

yes, it is the microprocessor subsystem

Quoted 5 lines

(It isn't quite clear from the PolarFire documentation I could find)

Quoted 3 lines
Signed-off-by Conor Dooley <[email protected]>

---

Quoted 7 lines

[...]

drivers/mailbox/Kconfig config MAILBOX_TEST · line 157

Quoted 2 lines
drivers/mailbox/Kconfig +2 -0
+config MPFS_MBOX
+	tristate "MPFS Mailbox"

"MPFS" in the title seems (to me) a bit too obscure for the uninitiated. Perhaps you could use something slightly longer that mentions Microchip and/or the PolarFire series?

Sure. MPFS is the part name while PolarFire SoC is the marketing name. I will switch it in the next version to POLARFIRE_SOC_MBOX, which better matches the config option for the SoC directory that's in Atish's patches anyway.

Quoted 9 lines

drivers/mailbox/mailbox-mpfs.c line 3

Quoted 5 lines

+++ b/drivers/mailbox/mailbox-mpfs.c

drivers/mailbox/mailbox-mpfs.c new file +3 -0
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip MPFS system controller/mailbox controller driver

The same might apply here.

Quoted 3 lines

Best regards,
Jonathan Neuschäfer

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