linux-kernel - Re: [PATCH v1 1/1] mmc: sdhci-s3c: Replace deprecated of_get_named

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Message-ID: <0522aa51-6141-4fd2-b312-f89b0f58d5d7@intel.com>
Date: Fri, 8 Mar 2024 12:07:18 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Ben Dooks <ben-linux@...ff.org>, Jaehoon Chung <jh80.chung@...sung.com>
Subject: Re: [PATCH v1 1/1] mmc: sdhci-s3c: Replace deprecated
 of_get_named_gpio()

On 7/03/24 14:19, Andy Shevchenko wrote:
> It seems the of_get_named_gpio() is solely used to check
> if the GPIO is present in DT as the function can return 0
> if and only if it's present and it becomes in the global
> number space 0. But this quite likely shows that the code
> wasn't ever been tested on the systems when no GPIO is provided.
> In any case, the proper test is just to call of_property_present()
> without any attempts in requesting GPIO (as we haven't saved the
> number or descriptor anywhere in the code).
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Looks to me like pdata->cd_type is zero either way, so it makes no
difference, unless of_get_named_gpio() has some side-effects.

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-s3c.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index 0e8a8ac14e56..6493b0edba34 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -17,10 +17,8 @@
>  #include <linux/slab.h>
>  #include <linux/clk.h>
>  #include <linux/io.h>
> -#include <linux/gpio.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> -#include <linux/of_gpio.h>
>  #include <linux/pm.h>
>  #include <linux/pm_runtime.h>
>  
> @@ -446,7 +444,7 @@ static int sdhci_s3c_parse_dt(struct device *dev,
>  		return 0;
>  	}
>  
> -	if (of_get_named_gpio(node, "cd-gpios", 0))
> +	if (of_property_present(node, "cd-gpios"))
>  		return 0;
>  
>  	/* assuming internal card detect that will be configured by pinctrl */