linux-kernel - Re: [PATCH 05/12] arm64: dts: qcom: apq8096-db820c: correct UFS pad supply

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Message-ID: <36f475ff-a6be-40ea-8a27-042d36b53daa@linaro.org>
Date:   Wed, 6 Sep 2023 11:43:29 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/12] arm64: dts: qcom: apq8096-db820c: correct UFS pad
 supply

On 5.09.2023 18:19, Krzysztof Kozlowski wrote:
> The Qualcomm UFS phy switched from dedicated driver to QMP phy driver.
> Eventually the old driver was removed in commit 02dca8c981b5 ("phy:
> qcom: remove ufs qmp phy driver").  The original driver and its binding
> used vddp-ref-clk regulator supply, but the new one did not and left the
> supply unused.
> 
> The Qualcomm UFS phy bindings were also migrated to newer ones and
> dropped support for vddp-ref-clk regulator in commit dc5cb63592bd
> ("dt-bindings: phy: migrate QMP UFS PHY bindings to
> qcom,sc8280xp-qmp-ufs-phy.yaml").
> 
> It turns out that this regulator, although with inaccurate name
> vddp-ref-clk, is actually needed to provide supply for VDD_PX10 (or
> similar, depending on the SoC) used by UFS controller.
> 
> Bring back handling of this supply by using more appropriate regulator -
> UFS controller host supply.  This also fixes dtbs_check warning:
> 
>   apq8096-db820c.dtb: phy@...000: 'vddp-ref-clk-supply' does not match any of the regexes: 'pinctrl-[0-9]+'
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad