linux-kernel - Re: [PATCH 1/5] dt-bindings: power: apple,pmgr-pwrstate: Add force-{disable,reset} properties

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Message-ID: <CAMT+MTSb2gdkfCZE3i+0ah8AgE_G8mH2MFTms=QgFwd-nbA8Ag@mail.gmail.com>
Date: Wed, 19 Feb 2025 10:43:17 +0100
From: Sasha Finkelstein <fnkl.kernel@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Sven Peter <sven@...npeter.dev>, Alyssa Rosenzweig <alyssa@...enzweig.io>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Hector Martin <marcan@...can.st>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, asahi@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	linux-media@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH 1/5] dt-bindings: power: apple,pmgr-pwrstate: Add
 force-{disable,reset} properties

On Wed, 19 Feb 2025 at 10:34, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On 19/02/2025 10:26, Sasha Finkelstein via B4 Relay wrote:
> > From: Sasha Finkelstein <fnkl.kernel@...il.com>
> >
> > Add properties to set disable/reset bits when powering down
> > certain domains
>
>
> Please explain why and what problem are you solving. This looks too
> close to SW policy or really arbitrary choice. Background would be useful.

The ISP block has some weird requirements where some of it's power domains
will not power down correctly without using the "force disable" or "force reset"
pmgr feature. Basically a hardware quirk.