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SubjectRe: [PATCH v3 6/6] pwm: mediatek: add MT2712/MT7622 support
On Fri, Jun 30, 2017 at 02:05:21PM +0800, Zhi Mao wrote:
> 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.

> +};
> +
> +struct mtk_com_pwm_data {

What does the _com stand for in the above?

> + unsigned int pwm_nums;
> };

Maybe name this num_pwms for consistency with other drivers?

>
> /**
> @@ -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.

> + 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?

> 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.

> 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
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