linux-kernel - Re: [PATCH 1/2] dt-bindings: soc: samsung: exynos-pmu: remove syscon for google,gs101-pmu

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Message-ID: <20251105-guillemot-of-demonic-courtesy-6127ac@kuoka>
Date: Wed, 5 Nov 2025 09:55:20 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Peter Griffin <peter.griffin@...aro.org>
Cc: André Draszik <andre.draszik@...aro.org>, 
	Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alim Akhtar <alim.akhtar@...sung.com>, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	dan.carpenter@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com, arnd@...db.de
Subject: Re: [PATCH 1/2] dt-bindings: soc: samsung: exynos-pmu: remove syscon
 for google,gs101-pmu

On Mon, Nov 03, 2025 at 08:03:10AM +0000, Peter Griffin wrote:
> Since commit ba5095ebbc7a ("mfd: syscon: Allow syscon nodes without a
> "syscon" compatible") it is possible to register a regmap without the
> syscon compatible in the node.
> 
> Update the bindings for google,gs101-pmu so that the syscon compatible is

That's an ABI break...

> no longer required. As it isn't really correct to claim we are compatible with
> syscon (as a mmio regmap created by syscon will not work on gs101).

... with kind of a reason, but then the question I have: was the
standard MMIO regmap exposed via syscon ever working for any part of
this PMU?

Original posting here:
https://lore.kernel.org/all/20231209233106.147416-2-peter.griffin@linaro.org/
did not change PMU driver and did not express that the syscon is broken.

Best regards,
Krzysztof