linux-kernel - Re: [PATCH v5 5/9] phy: phy-can-transceiver: Propagate return value of gpiod_set_value

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Message-ID: <aLmgH1O+xOrg/Zdy@lizhi-Precision-Tower-5810>
Date: Thu, 4 Sep 2025 10:20:15 -0400
From: Frank Li <Frank.li@....com>
To: Peng Fan <peng.fan@....com>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Aswath Govindraju <a-govindraju@...com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Haibo Chen <haibo.chen@....com>,
	linux-can@...r.kernel.org, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 5/9] phy: phy-can-transceiver: Propagate return value
 of gpiod_set_value_cansleep

On Thu, Sep 04, 2025 at 04:36:48PM +0800, Peng Fan wrote:
> gpiod_set_value_cansleep might return failure, propagate the return value
> of gpiod_set_value_cansleep to parent.

Nit: require "()" for function. gpiod_set_value_cansleep().

Reviewed-by: Frank Li <Frank.Li@....com>
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/phy/phy-can-transceiver.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c
> index b7d75a78d9242e2003660a87d2d4c9f784aea523..ccb29e1dfe0d07005b4bcd8fefa2787292d921a0 100644
> --- a/drivers/phy/phy-can-transceiver.c
> +++ b/drivers/phy/phy-can-transceiver.c
> @@ -46,23 +46,32 @@ static int can_transceiver_phy_power_on(struct phy *phy)
>  			return ret;
>  		}
>  	}
> -	gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0);
> -	gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1);
>
> -	return 0;
> +	ret = gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0);
> +	if (ret)
> +		return ret;
> +
> +	return gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1);
>  }
>
>  /* Power off function */
>  static int can_transceiver_phy_power_off(struct phy *phy)
>  {
>  	struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
> +	if (ret)
> +		return ret;
> +
> +	ret = gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
> +	if (ret)
> +		return ret;
>
> -	gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
> -	gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
>  	if (can_transceiver_phy->priv->mux_state)
> -		mux_state_deselect(can_transceiver_phy->priv->mux_state);
> +		ret = mux_state_deselect(can_transceiver_phy->priv->mux_state);
>
> -	return 0;
> +	return ret;
>  }
>
>  static const struct phy_ops can_transceiver_phy_ops = {
>
> --
> 2.37.1
>