linux-kernel - Re: [PATCH v3 2/4] dt-bindings: phy: qcom,qmp: Describe 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties

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Message-ID: <YmQhpsmiYJzR99LK@ripper>
Date:   Sat, 23 Apr 2022 08:56:22 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        bhupesh.linux@...il.com, agross@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, vkoul@...nel.org, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 2/4] dt-bindings: phy: qcom,qmp: Describe
 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties

On Mon 18 Apr 13:55 PDT 2022, Bhupesh Sharma wrote:

> Since a few boards based on QCoM qmp phy use the
> 'vdda-max-microamp' & 'vdda-pll-max-microamp' properties to
> describe the ufs phy nodes, add them to the dt-bindings doc as well.
> 
> This fixes the following '$ make dtbs_check' warning(s):
> 
> sm8350-microsoft-surface-duo2.dt.yaml: phy@...7000:
>   'vdda-max-microamp', 'vdda-pll-max-microamp' do not match any of
>    the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'
> 
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> index c39ead81ecd7..411c79dbfa15 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,qmp-phy.yaml
> @@ -90,6 +90,14 @@ properties:
>      minItems: 1
>      maxItems: 3
>  
> +  vdda-max-microamp:
> +    description:
> +      Specifies max. load that can be drawn from phy supply.
> +
> +  vdda-pll-max-microamp:
> +    description:
> +      Specifies max. load that can be drawn from pll supply.

It's not clear to me what an implementation would do with this
information. As expressed here it sounds like it's a property of the
specified regulator, so the driver should just request that information
from the regulator framework.

So let's wait with introducing such properties until we know.

Thanks,
Bjorn

> +
>    vdda-phy-supply:
>      description:
>        Phandle to a regulator supply to PHY core block.
> -- 
> 2.35.1
>