linux-kernel - Re: [PATCH 2/7] dt-bindings: power: Add apple,pmgr-pwrstate binding

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Date:   Thu, 7 Oct 2021 00:59:37 +0900
From:   Hector Martin <marcan@...can.st>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Marc Zyngier <maz@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/7] dt-bindings: power: Add apple,pmgr-pwrstate binding

On 06/10/2021 16.05, Krzysztof Kozlowski wrote:
>> +  IP cores belonging to a power domain should contain a
>> +  "power-domains" property that is a phandle for the
>> +  power domain node representing the domain.
> 
> Skip this last paragraph - it is obvious in usage of power domains.
> Specific bindings should not duplicate generic knowledge.

Ack, I'll drop it.

>> +properties:
>> +  $nodename:
>> +    pattern: "^power-controller@[0-9a-f]+$"
> 
> Usually we call nodes as power-domain.

I had it as that originally, but these aren't power domains. These are 
power management domains (they can clock *and* power gate separately, 
where supported) plus also do reset management. So I wasn't sure if it 
was really fair calling them "power-domain" at that point.

>> +  power-domains:
>> +    description:
>> +      Reference to parent power domains. A domain may have multiple parents,
>> +      and all will be powered up when it is powered.
> 
> How many items?

One or more (if there are none the property should not exist). I guess 
that should be encoded.

>> +
>> +  apple,domain-name:
> 
> Use existing binding "label".

Ah, I'd missed that one! I'm glad there's an existing binding for this 
already.

> Your parent schema should include this one for evaluating children.

Yup, I'll do it like that for v2.

Thanks!


-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub