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

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Date: Tue, 28 May 2024 11:08:02 +0200
From: neil.armstrong@...aro.org
To: Xianwei Zhao <xianwei.zhao@...ogic.com>, 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

On 28/05/2024 11:00, Xianwei Zhao wrote:
> 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?

The bindings mandates it to be a child of the secure monitor.

Neil

> 
>> Neil
>>
>>>   };
>>>
>>