linux-kernel - Re: [PATCH 3/3] arm64: dts: qcom: sm4450: Supply clock from cpufreq node to CPUs

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Date: Thu, 25 Apr 2024 11:17:19 +0800
From: Tengfei Fan <quic_tengfan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <rafael@...nel.org>, <viresh.kumar@...aro.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <manivannan.sadhasivam@...aro.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 3/3] arm64: dts: qcom: sm4450: Supply clock from cpufreq
 node to CPUs



On 4/24/2024 7:23 PM, Dmitry Baryshkov wrote:
> On Wed, 24 Apr 2024 at 13:17, Tengfei Fan <quic_tengfan@...cinc.com> wrote:
>>
>> Qualcomm platforms making use of CPUFreq HW Engine (EPSS/OSM) supply
>> clocks to the CPU cores. But this relationship is not represented in DTS
>> so far.
>>
>> So let's make cpufreq node as the clock provider and CPU nodes as the
>> consumers. The clock index for each CPU node is based on the frequency
>> domain index.
> 
> Is there any reason why this is not a part of the previous patch?

Before, I understood that clock and cpufreq support are two functions, 
so they were divided into two patches.

I will squash this patch in cpufreq support patch in the new version 
patch series.

> 
>>
>> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sm4450.dtsi | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm4450.dtsi b/arch/arm64/boot/dts/qcom/sm4450.dtsi
>> index 92badfd5b0e1..8d75c4f9731c 100644
>> --- a/arch/arm64/boot/dts/qcom/sm4450.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm4450.dtsi
>> @@ -47,6 +47,7 @@ CPU0: cpu@0 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x0>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_0>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -72,6 +73,7 @@ CPU1: cpu@100 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x100>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_100>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -91,6 +93,7 @@ CPU2: cpu@200 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x200>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_200>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -110,6 +113,7 @@ CPU3: cpu@300 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x300>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_300>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -129,6 +133,7 @@ CPU4: cpu@400 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x400>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_400>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -148,6 +153,7 @@ CPU5: cpu@500 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a55";
>>                          reg = <0x0 0x500>;
>> +                       clocks = <&cpufreq_hw 0>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_500>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -167,6 +173,7 @@ CPU6: cpu@600 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a78";
>>                          reg = <0x0 0x600>;
>> +                       clocks = <&cpufreq_hw 1>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_600>;
>>                          power-domains = <&CPU_PD0>;
>> @@ -186,6 +193,7 @@ CPU7: cpu@700 {
>>                          device_type = "cpu";
>>                          compatible = "arm,cortex-a78";
>>                          reg = <0x0 0x700>;
>> +                       clocks = <&cpufreq_hw 1>;
>>                          enable-method = "psci";
>>                          next-level-cache = <&L2_700>;
>>                          power-domains = <&CPU_PD0>;
>> --
>> 2.25.1
>>
>>
> 
> 

-- 
Thx and BRs,
Tengfei Fan