linux-kernel - Re: [PATCH] pwm: Use device_get_match

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Message-ID: <20231009193032.y7vn2bnluqhrfmmy@pengutronix.de>
Date:   Mon, 9 Oct 2023 21:30:32 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Rob Herring <robh@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Heiko Stuebner <heiko@...ech.de>, linux-pwm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] pwm: Use device_get_match_data()

On Mon, Oct 09, 2023 at 12:29:16PM -0500, Rob Herring wrote:
> Use preferred device_get_match_data() instead of of_match_device() to
> get the driver match data. With this, adjust the includes to explicitly
> include the correct headers.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/pwm/pwm-img.c      | 8 ++------
>  drivers/pwm/pwm-rockchip.c | 9 ++-------
>  2 files changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-img.c b/drivers/pwm/pwm-img.c
> index 326af85888e7..e32b5e8c203d 100644
> --- a/drivers/pwm/pwm-img.c
> +++ b/drivers/pwm/pwm-img.c
> @@ -13,9 +13,9 @@
>  #include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> -#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/property.h>
>  #include <linux/pwm.h>
>  #include <linux/regmap.h>
>  #include <linux/slab.h>
> @@ -261,7 +261,6 @@ static int img_pwm_probe(struct platform_device *pdev)
>  	u64 val;
>  	unsigned long clk_rate;
>  	struct img_pwm_chip *imgchip;
> -	const struct of_device_id *of_dev_id;
>  
>  	imgchip = devm_kzalloc(&pdev->dev, sizeof(*imgchip), GFP_KERNEL);
>  	if (!imgchip)
> @@ -273,10 +272,7 @@ static int img_pwm_probe(struct platform_device *pdev)
>  	if (IS_ERR(imgchip->base))
>  		return PTR_ERR(imgchip->base);
>  
> -	of_dev_id = of_match_device(img_pwm_of_match, &pdev->dev);
> -	if (!of_dev_id)
> -		return -ENODEV;
> -	imgchip->data = of_dev_id->data;
> +	imgchip->data = device_get_match_data(&pdev->dev);

Is this a semantical change? If there is a match, the code is
equivalent. Otherwise it was:

	return -ENODEV;

before and now it's

	imgchip->data = NULL;

isn't it?

>  	imgchip->periph_regs = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
>  							       "img,cr-periph");
> diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
> index 03ee18fb82d5..339165ef1f07 100644
> --- a/drivers/pwm/pwm-rockchip.c
> +++ b/drivers/pwm/pwm-rockchip.c
> @@ -10,8 +10,8 @@
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> -#include <linux/of_device.h>
>  #include <linux/platform_device.h>
> +#include <linux/property.h>
>  #include <linux/pwm.h>
>  #include <linux/time.h>
>  
> @@ -297,16 +297,11 @@ MODULE_DEVICE_TABLE(of, rockchip_pwm_dt_ids);
>  
>  static int rockchip_pwm_probe(struct platform_device *pdev)
>  {
> -	const struct of_device_id *id;
>  	struct rockchip_pwm_chip *pc;
>  	u32 enable_conf, ctrl;
>  	bool enabled;
>  	int ret, count;
>  
> -	id = of_match_device(rockchip_pwm_dt_ids, &pdev->dev);
> -	if (!id)
> -		return -EINVAL;
> -
>  	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
>  	if (!pc)
>  		return -ENOMEM;
> @@ -345,7 +340,7 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, pc);
>  
> -	pc->data = id->data;
> +	pc->data = device_get_match_data(&pdev->dev);
>  	pc->chip.dev = &pdev->dev;
>  	pc->chip.ops = &rockchip_pwm_ops;
>  	pc->chip.npwm = 1;

This has the same semantical change.

If this change is ok, it IMHO needs a more verbose commit log.

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

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