linux-kernel - Re: [PATCH 3/3] arm64: dts: amlogic: a4: add power domain controller node

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Date: Tue, 28 May 2024 17:00:11 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: neil.armstrong@...aro.org, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Kevin Hilman <khilman@...libre.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Jianxin Pan <jianxin.pan@...ogic.com>, Ulf Hansson <ulf.hansson@...aro.org>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: dts: amlogic: a4: add power domain controller
 node

Hi Neil,
    Thanks for your quickly reply.

On 2024/5/28 16:46, Neil Armstrong wrote:
> [ EXTERNAL EMAIL ]
> 
> On 28/05/2024 10:39, Xianwei Zhao via B4 Relay wrote:
>> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>
>> Add power domain controller node for Amlogic A4 SoC
>>
>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>> ---
>>   arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi | 4 ++++
>>   arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi        | 5 +++++
>>   2 files changed, 9 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi 
>> b/arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi
>> index b6106ad4a072..eebde77ae5b4 100644
>> --- a/arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/amlogic-a4-common.dtsi
>> @@ -27,6 +27,10 @@ xtal: xtal-clk {
>>               #clock-cells = <0>;
>>       };
>>
>> +     sm: secure-monitor {
>> +             compatible = "amlogic,meson-gxbb-sm";
>> +     };
>> +
>>       soc {
>>               compatible = "simple-bus";
>>               #address-cells = <2>;
>> diff --git a/arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi 
>> b/arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi
>> index 73ca1d7eed81..917c05219b9c 100644
>> --- a/arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/amlogic-a4.dtsi
>> @@ -37,4 +37,9 @@ cpu3: cpu@3 {
>>                       enable-method = "psci";
>>               };
>>       };
>> +
>> +     pwrc: power-controller {
>> +             compatible = "amlogic,a4-pwrc";
>> +             #power-domain-cells = <1>;
>> +     };
> 
> pwrc is supposed to be a child of secure-monitor.
> 
Considered writing it like this when I wrote this.

Here are two approaches: one is to include secure-monitor in the comm 
dtsi and fill power-controller by aliases in dtsi of each chip, while 
the other is to directly include secure-monitor in the dtsi of each 
chip. Which one do you suggest?

> Neil
> 
>>   };
>>
>