linux-kernel - Re: [PATCH v1 08/16] arm64: dts: mt8195: Add power domains controller

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Date:   Wed, 6 Jul 2022 15:41:36 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     iommu@...ts.linux-foundation.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v1 08/16] arm64: dts: mt8195: Add power domains controller



On 04/07/2022 14:38, Krzysztof Kozlowski wrote:
> On 04/07/2022 12:00, Tinghan Shen wrote:
>> Add power domains controller node for mt8195.
>>
>> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
>> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
>> ---
>>   arch/arm64/boot/dts/mediatek/mt8195.dtsi | 327 +++++++++++++++++++++++
>>   1 file changed, 327 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
>> index 8d59a7da3271..d52e140d9271 100644
>> --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
>> +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
>> @@ -10,6 +10,7 @@
>>   #include <dt-bindings/interrupt-controller/irq.h>
>>   #include <dt-bindings/phy/phy.h>
>>   #include <dt-bindings/pinctrl/mt8195-pinfunc.h>
>> +#include <dt-bindings/power/mt8195-power.h>
>>   
>>   / {
>>   	compatible = "mediatek,mt8195";
>> @@ -338,6 +339,332 @@
>>   			#interrupt-cells = <2>;
>>   		};
>>   
>> +		scpsys: syscon@...06000 {
>> +			compatible = "syscon", "simple-mfd";
> 
> These compatibles cannot be alone.
> 

You mean we would need something like "mediatek,scpsys" as dummy compatible 
that's not bound to any driver?

>> +			reg = <0 0x10006000 0 0x1000>;
>> +			#power-domain-cells = <1>;
> 
> If it is simple MFD, then probably it is not a power domain provider.
> Decide.

The SCPSYS IP block of MediaTek SoCs group several functionality, one is the 
power domain controller. Others are not yet implemented, but defining the scpsys 
as a MFD will give us the possibility to do so in the future.

Regards,
Matthias

> 
> Best regards,
> Krzysztof