linux-kernel - Re: [PATCH v2 0/5] exynos-acpm: add DVFS protocol and clock driver

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Message-ID: <28b5b033-76de-4fed-af6b-6d8342362c47@kernel.org>
Date: Sun, 31 Aug 2025 12:42:46 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Peter Griffin <peter.griffin@...aro.org>,
 André Draszik <andre.draszik@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-clk@...r.kernel.org, willmcvicker@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH v2 0/5] exynos-acpm: add DVFS protocol and clock driver

On 27/08/2025 14:42, Tudor Ambarus wrote:
> The Alive CLock and Power Manager (ACPM) firmware exposes clocks that
> are variable and index based. These clocks don't provide an entire range
> of values between the limits but only discrete points within the range.
> The firmware also manages the voltage scaling appropriately with the
> clock scaling. Make the ACPM node a clock provider.
> 
> Add support for the ACPM DVFS protocol. It translates clock frequency
> requests to messages that can be interpreted by the ACPM firmware.
> Add an ACPM clock driver to model the clocks exposed by the ACPM firmware.
> 
> All patches can go through the samsung tree.

You really should have explained the dependencies instead of me trying
to decipher how to handle this patch. It's really not trivial.

You do understand that clock is completely different subsystem (Stephen
Boyd)?


Best regards,
Krzysztof