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

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Date:   Thu, 7 Oct 2021 00:26:02 +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 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.

> No power-domain-cells? Why? What exactly this device is going to do?
> Maybe I'll check the driver first.... :)

It's a syscon, it does nothing on its own. All the work is done by the 
child nodes and the driver that binds to those.

>> +additionalProperties: true
> 
> additionalProperties: false

Fixed for v2.

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