linux-kernel - Re: [PATCH 01/32] pwm: sun4i: convert to devm_platform_ioremap

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Date:   Thu, 12 Nov 2020 17:13:46 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Yangtao Li <tiny.windzz@...il.com>, thierry.reding@...il.com
Cc:     claudiu.beznea@...rochip.com, thierry.reding@...il.com,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        ludovic.desroches@...rochip.com, rjui@...adcom.com,
        sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
        f.fainelli@...il.com, nsaenzjulienne@...e.de, shc_work@...l.ru,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, vz@...ia.com,
        slemieux.tyco@...il.com, khilman@...libre.com,
        matthias.bgg@...il.com, heiko@...ech.de, palmer@...belt.com,
        paul.walmsley@...ive.com, mripard@...nel.org, wens@...e.org,
        jonathanh@...dia.com, linux-arm-kernel@...ts.infradead.org,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-tegra@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 01/32] pwm: sun4i: convert to
 devm_platform_ioremap_resource

Hello Thierry,

On Sun, Dec 29, 2019 at 08:05:39AM +0000, Yangtao Li wrote:
> Use devm_platform_ioremap_resource() to simplify code.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/pwm/pwm-sun4i.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
> index 581d23287333..f2afd312f77c 100644
> --- a/drivers/pwm/pwm-sun4i.c
> +++ b/drivers/pwm/pwm-sun4i.c
> @@ -344,7 +344,6 @@ MODULE_DEVICE_TABLE(of, sun4i_pwm_dt_ids);
>  static int sun4i_pwm_probe(struct platform_device *pdev)
>  {
>  	struct sun4i_pwm_chip *pwm;
> -	struct resource *res;
>  	int ret;
>  
>  	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
> @@ -355,8 +354,7 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
>  	if (!pwm->data)
>  		return -ENODEV;
>  
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	pwm->base = devm_ioremap_resource(&pdev->dev, res);
> +	pwm->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(pwm->base))
>  		return PTR_ERR(pwm->base);

Can you please comment why you don't apply this series?

My point of view is:

devm_platform_ioremap_resource is the designated wrapper to replace
platform_get_resource() and devm_ioremap_resource(). So I don't see a
good reason to continue open coding it.

The patch series doesn't apply to 5.10-rc1 as is. (pwm-puv3 was removed
and a simple conflict in the pwm-rockchip driver.) The overall diffstat
(of the fixed series applied on top of 5.10-rc1) is

	31 files changed, 32 insertions(+), 96 deletions(-)

and it converts all of drivers/pwm but a single instance of
platform_get_resource() + devm_ioremap_resource() (for pwm-lpss where
platform_get_resource and devm_ioremap_resource are in different
functions (different files even)) which isn't trivial to fix.

So in my eyes applying this series is the right thing to do.

Best regards
Uwe

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

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