linux-kernel - Re: [RESEND v2 1/6] dt-bindings: power: Add JH7110 AON PMU support

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Message-ID: <a7cdfabf-2312-eaf3-f462-5bda7f0a120d@starfivetech.com>
Date:   Tue, 25 Apr 2023 15:57:25 +0800
From:   Changhuang Liang <changhuang.liang@...rfivetech.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
CC:     Conor Dooley <conor@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Walker Chen <walker.chen@...rfivetech.com>,
        Hal Feng <hal.feng@...rfivetech.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <vkoul@...nel.org>,
        <linux-phy@...ts.infradead.org>
Subject: Re: [RESEND v2 1/6] dt-bindings: power: Add JH7110 AON PMU support

>>>>>>  
>>>>>>  description: |
>>>>>>    StarFive JH7110 SoC includes support for multiple power domains which can be
>>>>>> @@ -17,6 +18,7 @@ properties:
>>>>>>    compatible:
>>>>>>      enum:
>>>>>>        - starfive,jh7110-pmu
>>>>>> +      - starfive,jh7110-aon-pmu
>>>
>>> I was speaking to Rob about this over the weekend, he asked:
>>> 'Why isn't "starfive,jh7110-aon-syscon" just the power-domain provider
>>> itself?'
>>
>> Maybe not, this syscon only offset "0x00" configure power switch.
>> other offset configure other functions, maybe not power, so this
>> "starfive,jh7110-aon-syscon" not the power-domain itself.
>>
>>> Do we actually need to add a new binding for this at all?
>>>
>>> Cheers,
>>> Conor.
>>>
>>
>> Maybe this patch do that.
>> https://lore.kernel.org/all/20230414024157.53203-6-xingyu.wu@starfivetech.com/
> 
> This makes it a child-node right? I think Rob already said no to that in
> and earlier revision of this series. What he meant the other day was
> making the syscon itself a power domain controller, since the child node
> has no meaningful properties (reg, interrupts etc).
> 
> Cheers,
> Conor.

Yes, "starfive,jh7110-aon-pmu" is a child-node of "starfive,jh7110-aon-syscon".
In my opinion, "0x17010000" is "aon-syscon" on JH7110 SoC, and this "aon-pmu" is just 
a part of "aon-syscon" function, so I think it is inappropriate to make "aon-syscon"
to a power domain controller. I think using the child-node description is closer to
JH7110 SoC.