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Thu, 30 Apr 2026 16:17:43 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:da43:aeff:fecc:bfd5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b9cae58906sm6249995ad.74.2026.04.30.16.17.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 16:17:43 -0700 (PDT) Date: Thu, 30 Apr 2026 16:17:42 -0700 From: Guenter Roeck To: florin.leotescu@oss.nxp.com Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Michael Shych , linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, daniel.baluta@nxp.com, viorel.suman@nxp.com, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, festevam@gmail.com, Florin Leotescu Subject: Re: [PATCH v7 3/3] hwmon: emc2305: Support configurable fan PWM at shutdown Message-ID: <931b8c3c-8555-4333-a660-e1d78fd67a00@roeck-us.net> References: <20260429065955.2113012-1-florin.leotescu@oss.nxp.com> <20260429065955.2113012-4-florin.leotescu@oss.nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260429065955.2113012-4-florin.leotescu@oss.nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260430_161746_588220_207966BD X-CRM114-Status: GOOD ( 12.50 ) 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 Wed, Apr 29, 2026 at 09:59:55AM +0300, florin.leotescu@oss.nxp.com wrote: > From: Florin Leotescu > > Some systems require fans to enter in a defined safe state during system > shutdown or reboot handoff. > > Add support for the optional Device Tree property "fan-shutdown-percent" > to configure the shutdown PWM duty cycle per fan output. > > If the property is present for a fan channel, the driver converts the > configured percentage value to the corresponding PWM duty cycle and > applies it during driver shutdown. > > If the property is not present, the fan state remains unchanged. > > Signed-off-by: Florin Leotescu I don't know if Sashiko's concerns are real; if sysfs accesses are still possible during shutdown, lots of drivers have problems. With that in mind, applied. Thanks, Guenter