Re: [PATCH v3] drm/panthor: attach the driver's multiple power domains

[Liviu Dudau <liviu.dudau@arm.com>]

On Wed, Oct 22, 2025 at 05:26:04PM +0800, Rain Yang wrote:
> From: Rain Yang <jiyu.yang@nxp.com>
> 
> Some platforms, such as i.MX95, utilize multiple power domains that need
> to be attached explicitly. This patch ensures that the driver properly
> attaches all available power domains using devm_pm_domain_attach_list().
> 
> Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
> Suggested-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Prabhu Sundararaj <prabhu.sundararaj@nxp.com>
> Signed-off-by: Rain Yang <jiyu.yang@nxp.com>

Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>

Best regards,
Liviu

> ---
>  drivers/gpu/drm/panthor/panthor_device.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c
> index f0b2da5b2b96..c39b9812eaa7 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.c
> +++ b/drivers/gpu/drm/panthor/panthor_device.c
> @@ -64,6 +64,16 @@ static int panthor_clk_init(struct panthor_device *ptdev)
>  	return 0;
>  }
>  
> +static int panthor_init_power(struct device *dev)
> +{
> +	struct dev_pm_domain_list  *pd_list = NULL;
> +
> +	if (dev->pm_domain)
> +		return 0;
> +
> +	return devm_pm_domain_attach_list(dev, NULL, &pd_list);
> +}
> +
>  void panthor_device_unplug(struct panthor_device *ptdev)
>  {
>  	/* This function can be called from two different path: the reset work
> @@ -218,6 +228,12 @@ int panthor_device_init(struct panthor_device *ptdev)
>  	if (ret)
>  		return ret;
>  
> +	ret = panthor_init_power(ptdev->base.dev);
> +	if (ret < 0) {
> +		drm_err(&ptdev->base, "init power domains failed, ret=%d", ret);
> +		return ret;
> +	}
> +
>  	ret = panthor_devfreq_init(ptdev);
>  	if (ret)
>  		return ret;
> -- 
> 2.39.5
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯