linux-kernel - Re: [PATCH v2 5/5] media: qcom: camss: Add support for named power-domains

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Message-ID: <d411e561-b0d0-48db-959e-3347006bce77@linaro.org>
Date:   Tue, 31 Oct 2023 11:53:05 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
        rfoss@...nel.org, todor.too@...il.com, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] media: qcom: camss: Add support for named
 power-domains

On 26.10.2023 17:50, Bryan O'Donoghue wrote:
> Right now we use fixed indexes to assign power-domains, with a
> requirement for the TOP GDSC to come last in the list.
> 
> Adding support for named power-domains means the declaration in the dtsi
> can come in any order.
> 
> After this change we continue to support the old indexing - if a SoC
> resource declration or the in-use dtb doesn't declare power-domain names
> we fall back to the default legacy indexing.
> 
> From this point on though new SoC additions should contain named
> power-domains, eventually we will drop support for legacy indexing.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  drivers/media/platform/qcom/camss/camss-vfe.c | 24 ++++++++++++++++-
>  drivers/media/platform/qcom/camss/camss.c     | 26 +++++++++++++++----
>  drivers/media/platform/qcom/camss/camss.h     |  2 ++
>  3 files changed, 46 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index ebd5da6ad3f2f..cb48723efd8a0 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -1381,7 +1381,29 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
>  	if (!res->line_num)
>  		return -EINVAL;
>  
> -	if (res->has_pd) {
> +	/* Power domain */
Unnecessary, I think

> +
> +	if (res->pd_name) {
No need to nullcheck, dev_pm_domain_attach_by_name seems to return
NULL when the name is NULL

[...]
> -	if (IS_ERR(camss->genpd)) {
> +	if (camss->res->pd_name) {
ditto
> +		camss->genpd = dev_pm_domain_attach_by_name(camss->dev,
> +							    camss->res->pd_name);
> +		if (IS_ERR(camss->genpd)) {
> +			ret = PTR_ERR(camss->genpd);
> +			goto fail_pm;
> +		}
> +	}
> +
Looks good otherwise, I think

Konrad