linux-kernel - Re: [PATCH 1/2] pinctrl: mediatek: paris: Fix PIN_CONFIG_INPUT_SCHMITT

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Date: Tue, 2 Apr 2024 13:10:34 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Sean Wang <sean.wang@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] pinctrl: mediatek: paris: Fix
 PIN_CONFIG_INPUT_SCHMITT_ENABLE readback

On Wed, Mar 27, 2024 at 05:13:33PM +0800, Chen-Yu Tsai wrote:
> In the generic pin config library, readback of some options are handled
> differently compared to the setting of those options: the argument value
> is used to convey enable/disable of an option in the set path, but
> success or -EINVAL is used to convey if an option is enabled or disabled
> in the debugfs readback path.
> 
> PIN_CONFIG_INPUT_SCHMITT_ENABLE is one such option. Fix the readback of
> the option in the mediatek-paris library, so that the debugfs dump is
> not showing "input schmitt enabled" for pins that don't have it enabled.
> 
> Fixes: 1bea6afbc842 ("pinctrl: mediatek: Refine mtk_pinconf_get()")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
>  drivers/pinctrl/mediatek/pinctrl-paris.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index b6bc31abd2b0..9353f78a52f0 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -193,6 +193,8 @@ static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
>  		}
>  
>  		err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret);
> +		if (!ret)
> +			err = -EINVAL;

In this function "ret" contains a mix of different data depending on
what the param is.  It's not always clear what "ret" means from one
line to the next.  I think it would be more clear to say
if (ret == MTK_DISABLE) in this case...

(I'm sorry to the list for sending so many nit picks today).

regards,
dan carpenter