linux-kernel - Re: [PATCH] soc: imx: gpcv2: print errno for regulator errors

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Date:   Thu, 9 Jun 2022 11:47:23 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com
Cc:     kernel@...i.sm, linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] soc: imx: gpcv2: print errno for regulator errors

Hello Martin,

On 09.06.22 11:44, Martin Kepplinger wrote:
> Make debugging of power management issues easier by printing the reason
> why a regulator fails to be enabled or disabled.
> 
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
> ---
>  drivers/soc/imx/gpcv2.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 3cb123016b3e..311507a815c5 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -233,7 +233,8 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
>  	if (!IS_ERR(domain->regulator)) {
>  		ret = regulator_enable(domain->regulator);
>  		if (ret) {
> -			dev_err(domain->dev, "failed to enable regulator\n");
> +			dev_err(domain->dev, "failed to enable regulator: %d\n",
> +				ret);

You could make it even more approachable by using %pe.

>  			goto out_put_pm;
>  		}
>  	}
> @@ -372,7 +373,8 @@ static int imx_pgc_power_down(struct generic_pm_domain *genpd)
>  	if (!IS_ERR(domain->regulator)) {
>  		ret = regulator_disable(domain->regulator);
>  		if (ret) {
> -			dev_err(domain->dev, "failed to disable regulator\n");
> +			dev_err(domain->dev,
> +				"failed to disable regulator: %d\n", ret);
>  			return ret;
>  		}
>  	}


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