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

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Message-ID: <20250221214117.GA119777-robh@kernel.org>
Date: Fri, 21 Feb 2025 15:41:17 -0600
From: Rob Herring <robh@...nel.org>
To: Sasha Finkelstein <fnkl.kernel@...il.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	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, Feb 19, 2025 at 10:43:17AM +0100, Sasha Finkelstein wrote:
> 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.

Add that to the commit message.

Rob