linux-kernel - Re: [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to model corners

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Message-ID: <bae910b7-2bc4-2984-9f5e-2b618b6b652b@codeaurora.org>
Date:   Thu, 31 May 2018 09:44:27 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     viresh.kumar@...aro.org, sboyd@...nel.org, andy.gross@...aro.org,
        ulf.hansson@...aro.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        collinsd@...eaurora.org
Subject: Re: [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to
 model corners



On 05/31/2018 08:57 AM, Rob Herring wrote:
> On Fri, May 25, 2018 at 03:31:16PM +0530, Rajendra Nayak wrote:
>> The powerdomains for corners just pass the performance state set by the
>> consumers to the RPM (Remote Power manager) which then takes care
>> of setting the appropriate voltage on the corresponding rails to
>> meet the performance needs.
>>
>> We add all powerdomain data needed on msm8996 here. This driver can easily
>> be extended by adding data for other qualcomm SoCs as well.
>>
>> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
>> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>> ---
>>  .../devicetree/bindings/power/qcom,rpmpd.txt  |  55 ++++
>>  drivers/soc/qcom/Kconfig                      |   9 +
>>  drivers/soc/qcom/Makefile                     |   1 +
>>  drivers/soc/qcom/rpmpd.c                      | 299 ++++++++++++++++++
>>  4 files changed, 364 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>>  create mode 100644 drivers/soc/qcom/rpmpd.c
>>
>> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> new file mode 100644
>> index 000000000000..68f620a2af0d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> @@ -0,0 +1,55 @@
>> +Qualcomm RPM Powerdomains
>> +
>> +* For RPM powerdomains, we communicate a performance state to RPM
>> +which then translates it into a corresponding voltage on a rail
>> +
>> +Required Properties:
>> + - compatible: Should be one of the following
>> +	* qcom,msm8996-rpmpd: RPM Powerdomain for the msm8996 family of SoC
>> + - power-domain-cells: number of cells in power domain specifier
>> +	must be 1.
>> + - operating-points-v2: Phandle to the OPP table for the power-domain.
>> +	Refer to Documentation/devicetree/bindings/power/power_domain.txt
>> +	and Documentation/devicetree/bindings/opp/qcom-opp.txt for more details
>> +
>> +Example:
>> +
>> +	rpmpd: power-controller {
>> +		compatible = "qcom,msm8996-rpmpd";
>> +		#power-domain-cells = <1>;
>> +		operating-points-v2 = <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>,
>> +				      <&rpmpd_opp_table>;
>> +	};
>> +
>> +	rpmpd_opp_table: opp-table {
>> +		compatible = "operating-points-v2-qcom-level", "operating-points-v2";
>> +
>> +		rpmpd_opp1: opp@1 {
> 
> unit-address without reg property is not valid.
> 
>> +			qcom,level = <1>;
> 
> Is this the only property? If so, I don't see the point in trying to use 
> operating-points-v2 here.

Thanks, I'll drop the unit address above and the compatible here.

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