linux-kernel - Re: [PATCH 1/7] dt-bindings: arm: apple: Add apple,pmgr binding

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Date:   Thu, 7 Oct 2021 00:21:25 +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 1/7] dt-bindings: arm: apple: Add apple,pmgr binding

On 06/10/2021 16.30, Krzysztof Kozlowski wrote:
> After looking at the code, there is no device for
> apple,t8103-pmgr/apple,pmgr. What is this binding about? Is there really
> a central (central as in "one device for SoC") block managing power
> which you want to model here?

The pwrstate driver binds to individual power control registers within 
the syscon node. The parent node is bound by the generic syscon driver, 
so there is no specific SoC driver for it, but I still want to include 
SoC-specific compatibles so we can have something to use for quirks if 
we run into trouble in the future.

There are two PMGRs in the Apple M1, and thus there would be two syscon 
nodes, each containing one subnode per PM domain. The devicetree in this 
series currently only instantiates one of those, though.

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