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Message-ID: <a7cdfabf-2312-eaf3-f462-5bda7f0a120d@starfivetech.com>
Date:   Tue, 25 Apr 2023 15:57:25 +0800
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Subject: Re: [RESEND v2 1/6] dt-bindings: power: Add JH7110 AON PMU support
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To:     Conor Dooley <conor.dooley@microchip.com>
CC:     Conor Dooley <conor@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Emil Renner Berthing <kernel@esmil.dk>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Walker Chen <walker.chen@starfivetech.com>,
        Hal Feng <hal.feng@starfivetech.com>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-riscv@lists.infradead.org>, <vkoul@kernel.org>,
        <linux-phy@lists.infradead.org>
References: <20230419035646.43702-1-changhuang.liang@starfivetech.com>
 <20230419035646.43702-2-changhuang.liang@starfivetech.com>
 <20230419-labored-camper-644d51a7ca96@spud>
 <1a5b15fa-4f20-51c2-2ba1-a04a2911a694@starfivetech.com>
 <20230424-baffle-punch-ec73098f2b6a@spud>
 <d685a1d4-c07d-7dfa-f1fb-b35ceb2aa0eb@starfivetech.com>
 <20230425-unquote-eligible-09f743d81981@wendy>
From:   Changhuang Liang <changhuang.liang@starfivetech.com>
In-Reply-To: <20230425-unquote-eligible-09f743d81981@wendy>
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>>>>>>  
>>>>>>  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.