linux-kernel - Re: [PATCH v2 2/2] drm/panthor: skip regulator setup if no such prop

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Message-ID: <67b8e65e-3caa-419b-acc0-61ad8cbc463b@arm.com>
Date: Thu, 2 Oct 2025 09:21:38 +0100
From: Steven Price <steven.price@....com>
To: Rain Yang <jiyu.yang@....nxp.com>, imx@...ts.linux.dev,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: boris.brezillon@...labora.com, liviu.dudau@....com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.co, simona@...ll.ch, marek.vasut@...lbox.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, Rain Yang <jiyu.yang@....com>
Subject: Re: [PATCH v2 2/2] drm/panthor: skip regulator setup if no such prop

On 28/09/2025 10:03, Rain Yang wrote:
> From: Rain Yang <jiyu.yang@....com>
> 
> The regulator is optional, skip the setup instead of returning an
> error if it is not present
> 
> Signed-off-by: Rain Yang <jiyu.yang@....com>

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panthor/panthor_devfreq.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c
> index 3686515d368d..2df1d76d84a0 100644
> --- a/drivers/gpu/drm/panthor/panthor_devfreq.c
> +++ b/drivers/gpu/drm/panthor/panthor_devfreq.c
> @@ -146,10 +146,9 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
>  	ptdev->devfreq = pdevfreq;
>  
>  	ret = devm_pm_opp_set_regulators(dev, reg_names);
> -	if (ret) {
> +	if (ret && ret != -ENODEV) {
>  		if (ret != -EPROBE_DEFER)
>  			DRM_DEV_ERROR(dev, "Couldn't set OPP regulators\n");
> -
>  		return ret;
>  	}
>