linux-kernel - Re: [PATCH 2/5] Input: mtk-pmic-keys - Use regmap_{set,clear}

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Date:   Sun, 22 May 2022 21:51:29 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     matthias.bgg@...il.com, mkorpershoek@...libre.com,
        linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] Input: mtk-pmic-keys - Use regmap_{set,clear}_bits
 where possible

On Fri, May 20, 2022 at 02:51:29PM +0200, AngeloGioacchino Del Regno wrote:
> Instead of always using regmap_update_bits(), let's go for the shorter
> regmap_set_bits() and regmap_clear_bits() where possible.
> 
> No functional change.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/input/keyboard/mtk-pmic-keys.c | 24 ++++++------------------
>  1 file changed, 6 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/input/keyboard/mtk-pmic-keys.c b/drivers/input/keyboard/mtk-pmic-keys.c
> index 8e4fa7cd16e6..83d0b90cc8cb 100644
> --- a/drivers/input/keyboard/mtk-pmic-keys.c
> +++ b/drivers/input/keyboard/mtk-pmic-keys.c
> @@ -157,28 +157,16 @@ static void mtk_pmic_keys_lp_reset_setup(struct mtk_pmic_keys *keys,
>  
>  	switch (long_press_mode) {
>  	case LP_ONEKEY:
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_PWRKEY_RST,
> -				   MTK_PMIC_PWRKEY_RST);
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_HOMEKEY_RST,
> -				   0);
> +		regmap_set_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_PWRKEY_RST);
> +		regmap_clear_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_HOMEKEY_RST);

Why not combine this into a single update instead? I.e. assuming

#define MTK_PMIC_KEY_RST_MASK GENMASK(6, 5)

		regmap_update_bits(keys->regmap, pmic_rst_reg,
				   MTK_PMIC_KEY_RST_MASK,
				   MTK_PMIC_PWRKEY_RST);

>  		break;
>  	case LP_TWOKEY:
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_PWRKEY_RST,
> -				   MTK_PMIC_PWRKEY_RST);
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_HOMEKEY_RST,
> -				   MTK_PMIC_HOMEKEY_RST);
> +		regmap_set_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_PWRKEY_RST);
> +		regmap_set_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_HOMEKEY_RST);

		regmap_update_bits(keys->regmap, pmic_rst_reg,
				   MTK_PMIC_KEY_RST_MASK,
				   MTK_PMIC_PWRKEY_RST | MTK_PMIC_HOMEKEY_RST);

>  		break;
>  	case LP_DISABLE:
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_PWRKEY_RST,
> -				   0);
> -		regmap_update_bits(keys->regmap, pmic_rst_reg,
> -				   MTK_PMIC_HOMEKEY_RST,
> -				   0);
> +		regmap_clear_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_PWRKEY_RST);
> +		regmap_clear_bits(keys->regmap, pmic_rst_reg, MTK_PMIC_HOMEKEY_RST);

		regmap_update_bits(keys->regmap, pmic_rst_reg,
				   MTK_PMIC_KEY_RST_MASKi, 0);

>  		break;
>  	default:
>  		break;
> -- 
> 2.35.1
> 

Thanks.

-- 
Dmitry