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Fri, 22 Aug 2025 08:03:42 -0700 (PDT) Message-ID: Date: Fri, 22 Aug 2025 16:03:38 +0100 Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] dt-bindings: firmware: google,gs101-acpm-ipc: add clocks node To: Rob Herring Cc: Krzysztof Kozlowski , Conor Dooley , Peter Griffin , =?UTF-8?Q?Andr=C3=A9_Draszik?= , Michael Turquette , Stephen Boyd , Krzysztof Kozlowski , Alim Akhtar , Sylwester Nawrocki , Chanwoo Choi , linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, willmcvicker@google.com, kernel-team@android.com References: <20250819-acpm-clk-v1-0-6bbd97474671@linaro.org> <20250819-acpm-clk-v1-1-6bbd97474671@linaro.org> <20250822135521.GA3487754-robh@kernel.org> Content-Language: en-US From: Tudor Ambarus In-Reply-To: <20250822135521.GA3487754-robh@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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