linux-kernel - Re: [PATCH 1/6] pwm: sprd: Add support for UMS9620

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Date: Fri, 26 Jan 2024 08:19:51 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Wenhua Lin <Wenhua.Lin@...soc.com>
Cc: Orson Zhai <orsonzhai@...il.com>, 
	Baolin Wang <baolin.wang@...ux.alibaba.com>, Chunyan Zhang <zhang.lyra@...il.com>, linux-pwm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, wenhua lin <wenhua.lin1994@...il.com>, 
	Xiongpeng Wu <xiongpeng.wu@...soc.com>, zhaochen su <zhaochen.su29@...il.com>, 
	Zhaochen Su <Zhaochen.Su@...soc.com>, Xiaolong Wang <Xiaolong.Wang@...soc.com>
Subject: Re: [PATCH 1/6] pwm: sprd: Add support for UMS9620

On Mon, Jan 22, 2024 at 04:17:49PM +0800, Wenhua Lin wrote:
> The PMW unit on the current Unisoc's SoCs has 4 channels but has different
> address offsets. On UMS512, they are 0x0, 0x20, 0x40, 0x60 respectively,
> while are 0x0, 0x4000, 0x8000, 0xC000 on UMS9620.
> 
> Signed-off-by: Wenhua Lin <Wenhua.Lin@...soc.com>
> ---
>  drivers/pwm/pwm-sprd.c | 28 ++++++++++++++++++++++++----
>  1 file changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c
> index 77939e161006..bc1e3ed13528 100644
> --- a/drivers/pwm/pwm-sprd.c
> +++ b/drivers/pwm/pwm-sprd.c
> @@ -9,6 +9,7 @@
>  #include <linux/math64.h>
>  #include <linux/mod_devicetable.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/platform_device.h>
>  #include <linux/pwm.h>
>  
> @@ -23,7 +24,6 @@
>  #define SPRD_PWM_ENABLE_BIT	BIT(0)
>  
>  #define SPRD_PWM_CHN_NUM	4
> -#define SPRD_PWM_REGS_SHIFT	5
>  #define SPRD_PWM_CHN_CLKS_NUM	2
>  #define SPRD_PWM_CHN_OUTPUT_CLK	1
>  
> @@ -32,14 +32,27 @@ struct sprd_pwm_chn {
>  	u32 clk_rate;
>  };
>  
> +struct sprd_pwm_data {
> +	int reg_shift;
> +};
> +
>  struct sprd_pwm_chip {
>  	void __iomem *base;
>  	struct device *dev;
>  	struct pwm_chip chip;
> +	const struct sprd_pwm_data *pdata;
>  	int num_pwms;
>  	struct sprd_pwm_chn chn[SPRD_PWM_CHN_NUM];
>  };
>  
> +static const struct sprd_pwm_data ums512_data = {
> +	.reg_shift = 5,
> +};
> +
> +static const struct sprd_pwm_data ums9620_data = {
> +	.reg_shift = 14,
> +};
> +
>  static inline struct sprd_pwm_chip* sprd_pwm_from_chip(struct pwm_chip *chip)
>  {
>  	return container_of(chip, struct sprd_pwm_chip, chip);
> @@ -58,7 +71,7 @@ static const char * const sprd_pwm_clks[] = {
>  
>  static u32 sprd_pwm_read(struct sprd_pwm_chip *spc, u32 hwid, u32 reg)
>  {
> -	u32 offset = reg + (hwid << SPRD_PWM_REGS_SHIFT);
> +	u32 offset = reg + (hwid << spc->pdata->reg_shift);
>  
>  	return readl_relaxed(spc->base + offset);
>  }
> @@ -66,7 +79,7 @@ static u32 sprd_pwm_read(struct sprd_pwm_chip *spc, u32 hwid, u32 reg)
>  static void sprd_pwm_write(struct sprd_pwm_chip *spc, u32 hwid,
>  			   u32 reg, u32 val)
>  {
> -	u32 offset = reg + (hwid << SPRD_PWM_REGS_SHIFT);
> +	u32 offset = reg + (hwid << spc->pdata->reg_shift);
>  
>  	writel_relaxed(val, spc->base + offset);
>  }
> @@ -253,6 +266,7 @@ static int sprd_pwm_clk_init(struct sprd_pwm_chip *spc)
>  static int sprd_pwm_probe(struct platform_device *pdev)
>  {
>  	struct sprd_pwm_chip *spc;
> +	const void *priv;

This can better be of type struct sprd_pwm_data *. Also pdata would be a
better name.

>  	int ret;
>  
>  	spc = devm_kzalloc(&pdev->dev, sizeof(*spc), GFP_KERNEL);
> @@ -263,6 +277,11 @@ static int sprd_pwm_probe(struct platform_device *pdev)
>  	if (IS_ERR(spc->base))
>  		return PTR_ERR(spc->base);
>  
> +	priv = of_device_get_match_data(&pdev->dev);
> +	if (!priv)
> +		return dev_err_probe(&pdev->dev, -EINVAL, "get regs shift failed!\n");
> +	spc->pdata = priv;
> +
>  	spc->dev = &pdev->dev;
>  
>  	ret = sprd_pwm_clk_init(spc);
> @@ -281,7 +300,8 @@ static int sprd_pwm_probe(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id sprd_pwm_of_match[] = {
> -	{ .compatible = "sprd,ums512-pwm", },
> +	{ .compatible = "sprd,ums512-pwm",	.data = (void *)&ums512_data},
> +	{ .compatible = "sprd,ums9620-pwm",	.data = (void *)&ums9620_data},

Please use one line per assignment. Do you really need the cast to void
*?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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