linux-kernel - Re: [PATCH 1/3] dt-bindings: firmware: google,gs101-acpm-ipc: add clocks node

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Message-ID: <ebea336e-c43f-4519-b2c6-4f8812e29448@linaro.org>
Date: Fri, 22 Aug 2025 16:03:38 +0100
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Rob Herring <robh@...nel.org>
Cc: 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>, Krzysztof Kozlowski <krzk@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>, 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 1/3] dt-bindings: firmware: google,gs101-acpm-ipc: add
 clocks node

Hi, Rob,

On 8/22/25 2:55 PM, Rob Herring wrote:
> On Tue, Aug 19, 2025 at 11:45:36AM +0000, Tudor Ambarus wrote:
>> The firmware exposes clocks that can be controlled via the ACPM
>> interface. Describe the clocks exposed by the APM firmware.
> 
> ACPM? APM is Advanced Power Management aka the predecessor to ACPI?

ACPM (Alive Clock and Power Manager) is a firmware that operates on the                                 
APM (Active Power Management) module that handles overall power management                              
activities. APM is built around a GREBE processor.

In linux we have an ACPM protocol driver that communicates with the firmware
via mailbox channels. It's similar to arm,scmi if you want.

Cheers,
ta