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

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Message-ID: <a5d52d94-4d42-6842-a40f-db25d2581929@canonical.com>
Date:   Thu, 7 Oct 2021 15:10:37 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Hector Martin <marcan@...can.st>,
        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 17:26, Hector Martin wrote:
> On 06/10/2021 15.56, Krzysztof Kozlowski wrote:
>>> diff --git a/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml b/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml
>>> new file mode 100644
>>> index 000000000000..0304164e4140
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml
>>> @@ -0,0 +1,74 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/arm/apple/apple,pmgr.yaml#
>>
>> Please don't store all Apple-related bindings in bindings/arm/apple, but
>> instead group per device type like in most of other bindings. In this
>> case - this looks like something close to power domain controller, so it
>> should be in bindings/power/
> 
> This is a controller that, right now, is only used to instantiate device 
> power management controls, but the controller itself is just a generic 
> syscon device. Depending on the register range, it could conceivably 
> encompass other register types (e.g. clock selects) within it, though 
> I'm not sure I want to do that right now. Apple calls several of these 
> different register sets as a whole a "PMGR". So I'm not sure if it 
> really qualifies as "just" a power domain controller. If we want to 
> restrict this to the power state portion of PMGR, then it might make 
> sense to call it something more specific...
> 
> See arm/rockchip/pmu.yaml for the setup this is modeled after.
> 

Makes sense now and actually few other designs including Samsung Exynos
have it as well.


Best regards,
Krzysztof