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Wysocki" , Daniel Lezcano , Zhang Rui , Lukasz Luba , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Krzysztof Kozlowski , Alim Akhtar , Bartlomiej Zolnierkiewicz , Kees Cook , "Gustavo A. R. Silva" , Peter Griffin , =?UTF-8?Q?Andr=C3=A9_Draszik?= Cc: willmcvicker@google.com, jyescas@google.com, shin.son@samsung.com, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org References: <20260119-acpm-tmu-v2-0-e02a834f04c6@linaro.org> <20260119-acpm-tmu-v2-1-e02a834f04c6@linaro.org> Content-Language: en-US From: Tudor Ambarus In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260417_062853_383332_F616659D X-CRM114-Status: GOOD ( 17.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/5/26 5:48 AM, Alexey Klimov wrote: > Hi Tudor, > > On Mon Jan 19, 2026 at 12:08 PM GMT, Tudor Ambarus wrote: >> Document the Thermal Management Unit (TMU) found on the Google GS101 SoC. >> >> The GS101 TMU utilizes a hybrid control model shared between the >> Application Processor (AP) and the ACPM (Alive Clock and Power Manager) >> firmware. >> >> While the TMU is a standard memory-mapped IP block, on this platform > > this ^^ > okay cut > Is it Google TMU hardware block or Exynos/Samsung TMU block? > > My understanding at this point is that ACPM interface, ACPM protocols, etc > appeared on Samsung SoCs before gs101 (maybe even before initial SCMI > prototyping). It looks like ACPM firmware, communication via mailboxes, > TMU channel, dealing with TMU behing ACPM, etc are actually a standard > Samsung Exynos architectural feature, rather than a Google-specific > implementation. I can't say though what was the first chipset where it > was implemented. autov920, exynos850 too can use the hybrid ACPM TMU approach. I'll generalize the description. > > Given that this is a Samsung design that predates the gs101, would it > make sense to use more generic name for this binding to reflect that > it is Exynos-derived? That would save us from generalizing things later The name has to match the compatible. We can rename it when other Samsung compatibles are added. Cheers, ta