Hi Thierry,

Thanks for your review  code.
I will modify the code as you comment in the next release.

Regards
Zhi

On Mon, 2017-08-21 at 10:05 +0200, Thierry Reding wrote:

On Fri, Jun 30, 2017 at 02:05:21PM +0800, Zhi Mao wrote:

quoted

1. support multiple chip(MT2712, MT7622, MT7623)
2. add mtk_pwm_com_reg for match the registers of MT2712 pwm8
   the register offset address of pwm8 for MT2712 is not fixed 0x40
   and they are not the same as pwm0~6.

Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>
---
 drivers/pwm/pwm-mediatek.c |   55 +++++++++++++++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index 1d78ab1..2c9ce24 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c

@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
 #include <linux/slab.h>

@@ -40,11 +41,19 @@ enum {
 	MTK_CLK_PWM3,
 	MTK_CLK_PWM4,
 	MTK_CLK_PWM5,
+	MTK_CLK_PWM6,
+	MTK_CLK_PWM7,
+	MTK_CLK_PWM8,
 	MTK_CLK_MAX,
 };
 
-static const char * const mtk_pwm_clk_name[] = {
-	"main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5"
+static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = {
+	"main", "top", "pwm1", "pwm2", "pwm3", "pwm4",
+	"pwm5", "pwm6", "pwm7", "pwm8"

You're wrapping these lines at arbitrary boundaries. Make sure to use
all of the 80 columns at your disposal.

quoted

+};
+
+struct mtk_com_pwm_data {

What does the _com stand for in the above?

quoted

+	unsigned int pwm_nums;
 };

Maybe name this num_pwms for consistency with other drivers?

quoted

 
 /**

@@ -57,6 +66,11 @@ struct mtk_pwm_chip {
 	struct pwm_chip chip;
 	void __iomem *regs;
 	struct clk *clks[MTK_CLK_MAX];
+	const struct mtk_com_pwm_data *data;
+};
+
+static const unsigned long mtk_pwm_com_reg[] = {

There's another of these _com that I don't understand what it means.
Also since these are all fairly small offsets, these can simply be
unsigned int.

quoted

+	0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220
 };
 
 static inline struct mtk_pwm_chip *to_mtk_pwm_chip(struct pwm_chip *chip)

@@ -103,14 +117,14 @@ static void mtk_pwm_clk_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 static inline u32 mtk_pwm_readl(struct mtk_pwm_chip *chip, unsigned int num,
 				unsigned int offset)
 {
-	return readl(chip->regs + 0x10 + (num * 0x40) + offset);
+	return readl(chip->regs + mtk_pwm_com_reg[num] + offset);
 }
 
 static inline void mtk_pwm_writel(struct mtk_pwm_chip *chip,
 				  unsigned int num, unsigned int offset,
 				  u32 value)
 {
-	writel(value, chip->regs + 0x10 + (num * 0x40) + offset);
+	writel(value, chip->regs + mtk_pwm_com_reg[num] + offset);
 }
 
 static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,

@@ -194,23 +208,28 @@ static int mtk_pwm_probe(struct platform_device *pdev)
 	if (!pc)
 		return -ENOMEM;
 
+	pc->data = of_device_get_match_data(&pdev->dev);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pc->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(pc->regs))
 		return PTR_ERR(pc->regs);
 
-	for (i = 0; i < MTK_CLK_MAX; i++) {
+	for (i = 0; i < pc->data->pwm_nums + 2; i++) {
 		pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]);
-		if (IS_ERR(pc->clks[i]))
+		if (IS_ERR(pc->clks[i])) {
+			dev_err(&pdev->dev, "[PWM] clock: %s fail: %ld\n",
+				mtk_pwm_clk_name[i], PTR_ERR(pc->clks[i]));

Why include the "[PWM] " prefix in the above message?

quoted

 			return PTR_ERR(pc->clks[i]);
+		}
 	}
 
-	platform_set_drvdata(pdev, pc);
-
 	pc->chip.dev = &pdev->dev;
 	pc->chip.ops = &mtk_pwm_ops;
 	pc->chip.base = -1;
-	pc->chip.npwm = 5;
+	pc->chip.npwm = pc->data->pwm_nums;
+
+	platform_set_drvdata(pdev, pc);

No need to move the location of the platform_set_drvdata() call. It's
needless churn.

quoted

 static const struct of_device_id mtk_pwm_of_match[] = {
-	{ .compatible = "mediatek,mt7623-pwm" },
-	{ }
+	{.compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data},
+	{.compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data},
+	{.compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data},
+	{},

Spaces after { and before }, please.

Thierry