linux-kernel - Re: [PATCH v2 1/2] arm64: dts: qcom: sm8650-mtp: add PM8010 regulators

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Date: Thu, 25 Jan 2024 10:54:14 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: David Collins <quic_collinsd@...cinc.com>, quic_fenglinw@...cinc.com,
 kernel@...cinc.com, 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: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v2 1/2] arm64: dts: qcom: sm8650-mtp: add PM8010
 regulators



On 1/25/24 03:52, David Collins wrote:
> On 1/24/24 15:36, Konrad Dybcio wrote:
>> On 1/24/24 20:15, David Collins wrote:
>>> On 1/23/24 00:49, Fenglin Wu via B4 Relay wrote:
>>>> From: Fenglin Wu <quic_fenglinw@...cinc.com>
>>>>
>>>> Add PM8010 regulator device nodes for sm8650-mtp board.
>>>>
>>>> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
>>>> Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
> ...
>>>> +
>>>> +        vreg_l1m_1p1: ldo1 {
>>>> +            regulator-name = "vreg_l1m_1p1";
>>>> +            regulator-min-microvolt = <1104000>;
>>>> +            regulator-max-microvolt = <1104000>;
>>>> +            regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>>>
>>> Optional:
>>> PM8010 L1 and L2 physically support LPM vs HPM configuration.
>>> Therefore, these lines could be added here to allow such configuration
>>> by software at runtime:
>>>
>>> regulator-allow-set-load;
>>> regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM
>>>                 RPMH_REGULATOR_MODE_HPM>;
>>
>> David,
>>
>> I was under the impression that *all* RPMh regulators support
>> modesetting. Would that be an incorrect assumption to make?
>>
>> Konrad
> 
> Hello Konrad,
> 
> That is generally true.  However, PM8010 LDOs 3-7 are a special case.
> These do not support LPM configuration.  The limitation is enforced in
> the driver by this change:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2544631faa7f3244c9bcb9b511ca4f1a4f5a3ba0

Oh, I never noticed that. Thanks a lot for confirming!

Konrad