linux-kernel - Re: [PATCH 1/2] regulator: mt6370: Use 'fwnode_gpiod_get

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Message-ID: <618f0794-429c-705d-ab4c-84aace6aaaaa@collabora.com>
Date:   Wed, 29 Jun 2022 10:23:06 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     cy_huang <u0084500@...il.com>, broonie@...nel.org
Cc:     lgirdwood@...il.com, matthias.bgg@...il.com, chiaen_wu@...htek.com,
        alice_chen@...htek.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        ChiYuan Huang <cy_huang@...htek.com>
Subject: Re: [PATCH 1/2] regulator: mt6370: Use 'fwnode_gpiod_get_index' to
 fix gpio parsing

Il 29/06/22 03:41, cy_huang ha scritto:
> From: ChiYuan Huang <cy_huang@...htek.com>
> 
> From the common binding, 'enable-gpio' or 'enable-gpios' are all well
> for external 'enable' gpio.
> 
> 'gpiod_get_from_of_node' only parse the 'enable' property, it need to
> add the gpio suffix. It's more convenient to use fwnode_gpiod_get_index.
> Although fwnode parsing is not preferred, but 'of_parse_cb' already can
> guarantee the callback will only be used by regulator of_node parsing.
> 
> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> ---
>   drivers/regulator/mt6370-regulator.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/regulator/mt6370-regulator.c b/drivers/regulator/mt6370-regulator.c
> index bc356b4..949b2c7 100644
> --- a/drivers/regulator/mt6370-regulator.c
> +++ b/drivers/regulator/mt6370-regulator.c
> @@ -153,7 +153,8 @@ static int mt6370_of_parse_cb(struct device_node *np,
>   	struct gpio_desc *enable_gpio;
>   	int ret;
>   
> -	enable_gpio = gpiod_get_from_of_node(np, "enable", 0, GPIOD_OUT_HIGH |
> +	enable_gpio = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,

Since this driver is never calling gpiod_put(), you can even fix that in one shot.

Just use devm_fwnode_gpiod_get() here, as it's guaranteed that priv->dev is
initialized at this time.

Cheers,
Angelo