linux-kernel - Re: [PATCH 15/16] soc: imx: gpcv2: support reset defer probe

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Date:   Thu, 29 Apr 2021 10:39:14 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     marex@...x.de, devicetree@...r.kernel.org,
        Peng Fan <peng.fan@....com>, kernel@...gutronix.de,
        abel.vesa@....com, andrew.smirnov@...il.com, aford173@...il.com,
        agx@...xcpu.org, linux-kernel@...r.kernel.org, krzk@...nel.org,
        frieder.schrempf@...tron.de, ping.bai@....com, linux-imx@....com,
        p.zabel@...gutronix.de, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org, l.stach@...gutronix.de
Subject: Re: [PATCH 15/16] soc: imx: gpcv2: support reset defer probe

Hi,

On 29.04.21 09:30, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> When gpcv2 probe, the reset controller might not be ready, so we need
> defer probe
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/soc/imx/gpcv2.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 072f519462a5..49dd137f6b94 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -784,9 +784,12 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>  				     "Failed to get domain's clocks\n");
>  
>  	domain->reset = devm_reset_control_array_get_optional_exclusive(domain->dev);
> -	if (IS_ERR(domain->reset))
> +	if (IS_ERR(domain->reset)) {
> +		if (PTR_ERR(domain->reset) == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;
>  		return dev_err_probe(domain->dev, PTR_ERR(domain->reset),
>  				     "Failed to get domain's resets\n");

dev_err_probe already propagates the error code in its second argument.
Seems to me this patch's only effect is to disable deferred probe reason tracking?

> +	}
>  
>  	pm_runtime_enable(domain->dev);
>  
> 

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