linux-kernel - Re: [PATCH 1/6] arm64: dts: qcom: sm8550-mtp: use correct UFS supply

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Message-ID: <8197d5c6-bd05-ff16-59d5-ba3eb06a5921@linaro.org>
Date:   Wed, 6 Sep 2023 14:05:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...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 1/6] arm64: dts: qcom: sm8550-mtp: use correct UFS supply

On 06/09/2023 13:50, Konrad Dybcio wrote:
> On 6.09.2023 13:39, Krzysztof Kozlowski wrote:
>> On 06/09/2023 13:28, Konrad Dybcio wrote:
>>> On 6.09.2023 12:47, Krzysztof Kozlowski wrote:
>>>> According to schematics the VCCQ2 supply is not connected and the L3G
>>>> regulator instead powers up the controller pads (VDD_PX10).  Use correct
>>>> supply vdd-hba and drop unsupported current limit for the vdd-hba.
>>> Why is it unsupported?
>>
>> Maybe I was here not precise. I move the regulator from vccq2 to
>> vdd-hba. vccq2 has control of current in UFS core driver. Bindings also
>> allow it.
> Looks like the bindings are out of sync with the driver.
> 
> ufshcd_populate_vreg() which parses current is used for both vccq2
> and vdd-hba.

Just for convenience. The current is not used for vdd-hba. Also:

https://lore.kernel.org/all/20230906113302.201888-1-krzysztof.kozlowski@linaro.org/

Best regards,
Krzysztof