linux-kernel - Re: [PATCH v4 1/2] dt-bindings: media: qcom,qcs8300-camss: Add missing power supplies

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Message-ID: <bfa0d4f2-45c6-463e-8afc-d90edcf8cf2f@linaro.org>
Date: Wed, 15 Oct 2025 21:41:32 +0300
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Vikram Sharma <quic_vikramsa@...cinc.com>, mchehab@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 andersson@...nel.org, konradybcio@...nel.org, hverkuil-cisco@...all.nl,
 cros-qcom-dts-watchers@...omium.org, catalin.marinas@....com, will@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, quic_svankada@...cinc.com,
 linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Nihal Kumar Gupta <quic_nihalkum@...cinc.com>, bryan.odonoghue@...aro.org
Subject: Re: [PATCH v4 1/2] dt-bindings: media: qcom,qcs8300-camss: Add
 missing power supplies

On 10/15/25 16:01, Vikram Sharma wrote:
> Add support for vdda-phy-supply and vdda-pll-supply in the QCS8300
> CAMSS binding to reflect camera sensor hardware requirements.

What are "camera sensor hardware requirements"? You do add properties
to the ISP.

> 
> Co-developed-by: Nihal Kumar Gupta <quic_nihalkum@...cinc.com>
> Signed-off-by: Nihal Kumar Gupta <quic_nihalkum@...cinc.com>
> Signed-off-by: Vikram Sharma <quic_vikramsa@...cinc.com>
> ---
>   .../bindings/media/qcom,qcs8300-camss.yaml          | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/qcom,qcs8300-camss.yaml b/Documentation/devicetree/bindings/media/qcom,qcs8300-camss.yaml
> index 80a4540a22dc..dce0a1fcb10c 100644
> --- a/Documentation/devicetree/bindings/media/qcom,qcs8300-camss.yaml
> +++ b/Documentation/devicetree/bindings/media/qcom,qcs8300-camss.yaml
> @@ -120,6 +120,14 @@ properties:
>       items:
>         - const: top
>   
> +  vdda-phy-supply:
> +    description:
> +      Phandle to a regulator supply to PHY core block.

What is "PHY core block" here?

> +
> +  vdda-pll-supply:
> +    description:
> +      Phandle to 1.8V regulator supply to PHY refclk pll block.

This is a copy-paste example of a known to be wrong pattern.

If you open a QCS8300 documentation or a schematics of some QCS8300 powered
board, can you get a link between the actual pin names and the introduced
property? Likely there should be nothing, which resembles "PHY refclk pll
block" over there, and thus the description of the property is misleading.

Please check other similar and recently added properties, like it's been
done if you add a voltage level reference (and that's the only known for
sure information), there will be no need to guess the right voltage level.
And it's either incorrect in the description above or in the example below.

> +
>     ports:
>       $ref: /schemas/graph.yaml#/properties/ports
>   
> @@ -160,6 +168,8 @@ required:
>     - power-domains
>     - power-domain-names
>     - ports
> +  - vdda-phy-supply
> +  - vdda-pll-supply
>   
>   additionalProperties: false
>   
> @@ -328,6 +338,9 @@ examples:
>               power-domains = <&camcc CAM_CC_TITAN_TOP_GDSC>;
>               power-domain-names = "top";
>   
> +            vdda-phy-supply = <&vreg_l4a_0p88>;
> +            vdda-pll-supply = <&vreg_l1c_1p2>;
> +
>               ports {
>                   #address-cells = <1>;
>                   #size-cells = <0>;

-- 
Best wishes,
Vladimir