linux-kernel - Re: [PATCH 4/4] arm64: dts: qcom: sm6375-pdx225: Add USBPHY regulators

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Date:   Wed, 27 Sep 2023 13:05:56 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...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>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: qcom: sm6375-pdx225: Add USBPHY
 regulators

On 27.09.2023 13:01, Bryan O'Donoghue wrote:
> On 27/09/2023 10:21, Konrad Dybcio wrote:
>> To make dtbs_check happy and the software more aware of what's going
>> on, describe the HSUSB PHY's regulators and tighten up VDDA_PLL to match.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>   arch/arm64/boot/dts/qcom/sm6375-sony-xperia-murray-pdx225.dts | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm6375-sony-xperia-murray-pdx225.dts b/arch/arm64/boot/dts/qcom/sm6375-sony-xperia-murray-pdx225.dts
>> index bbec7aee60be..0ce4fa8de8b0 100644
>> --- a/arch/arm64/boot/dts/qcom/sm6375-sony-xperia-murray-pdx225.dts
>> +++ b/arch/arm64/boot/dts/qcom/sm6375-sony-xperia-murray-pdx225.dts
>> @@ -243,8 +243,8 @@ pm6125_l6: l6 {
>>           };
>>             pm6125_l7: l7 {
>> -            regulator-min-microvolt = <720000>;
>> -            regulator-max-microvolt = <1050000>;
>> +            regulator-min-microvolt = <880000>;
>> +            regulator-max-microvolt = <880000>;
> 
> Where did the old values come from and why are the new values better ?
> 
> Consider enumerating that in the commit log.
That's the pretty standard situation where:

- downstream defines very loose ranges
- developer uses these very loose ranges as a guideline
- some hardware (often the exclusive user of that regulator)
  has a hidden-ish request of a tighter range
- the developer realizes that and has to fix up the ranges

Konrad