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Tue, 06 Oct 2026 06:03:36 -0700 (PDT) Received: from arrakeen.starnux.net ([2a01:e0a:106d:1080:52eb:f6ff:feb3:451a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a178caf832sm81042065e9.4.2026.10.06.06.03.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2026 06:03:35 -0700 (PDT) MIME-Version: 1.0 Subject: Re: [PATCH] arm64: dts: amlogic: meson-sm1-odroid-hc4: add the fan tachometer From: Neil Armstrong To: Igor Velkov In-Reply-To: <179126094299.1095177.4869656735733059341@iav.lv> References: <20261006-hc4-fan-tach-v1-1-4e7cecf0b45b@iav.lv> <20261006041733.8C4081F000FF@smtp.kernel.org> <179126094299.1095177.4869656735733059341@iav.lv> Date: Tue, 06 Oct 2026 15:03:29 +0200 Message-Id: <179129180999.592940.1230542534490853306.b4-reply@b4> X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1010; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=an8RRqaHB41r0ebVeLgeXHHwXpS6JRCN4uHoaw5ZiSU=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBqxPGmrDte5eWAM2zYZCOxW+dCQx8lZh15pobaMzdK 8mhJRwOJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCasTxpgAKCRB33NvayMhJ0XryD/ 48bpmUXwaPrcjsq5bMH5cKzGfT54W2AWi9J6zlK/7uVia8sMg1eGMfQciIz96Z9EguvHk1CpDiEL1g UkGmSjQE6v7C8p31NwNiO4Wmv04iLWsQc3HCW9nFuJLTkD05DVmXQW76hrxq8Fks+4Twyj+lQr1UPx LLqWXxFvdwh4wOTenYpKuUGlAXYizzthnQkilSyO6nqdz+WpIj9sQCr5gYi60L+LhJfNeZ1VsCGaAZ SQ4oFW4pi0ZBiplW0d739hCWQ+IaX/BIzQ0BrTxiHM3eMwJAI5h49uDpyp1fOzJfExphssTAwc4YQD /C2A8wTq3eVk5DIsQRBLb3iSe0+O+dOOMDIXy47U5isY0WWgNwubBC7fkmA3b8dawfZwOdbT/rSQ4l uJTdQxz4VpKNvk+fdGmiBUjSJxiwwbgowIOPu4mwOo8qztFd6S7HpUH6cKZzEL0Sny/8kgmodOXyTG dpbxnoekOMkmqmghcLsQWAoWKPC9gcSbWw5WL7d7KvnmTdeS2jRFef84NmI1ys10EtS8IfsAHc9Oav 3uOP4tnpM+b+4Ew67j4fQm1wb/dFuG2o/fJfwssqHNrg+6KMCnXDrD906eLuPlzRlqeb8sXBuUnOqC l/XQMQw5ZPbpbyyF5p8bBfHZqmv5wAg56d9JBitTQ12lYBC5g1xU2vid+g/Q== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261006_060338_412670_05773813 X-CRM114-Status: GOOD ( 12.69 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Neil Armstrong , Conor Dooley , Rob Herring , Martin Blumenstingl , Kevin Hilman , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, Jerome Brunet Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 2026-10-06 07:29:02+03:00, Igor Velkov wrote: > On Tue, 06 Oct 2026 04:17:33 +0000, sashiko-bot@kernel.org wrote: > > > Without an explicit pinctrl-0 property in the fan0 node, will the fan > > tachometer silently fail to read the fan speed (always reporting 0) on systems > > where the bootloader leaves GPIOX_7 configured as an alternate function (such > > as uart_b_rx or pwm_f_x) instead of a GPIO input? > > Checked on the board: with GPIOX_7 muxed to uart_b_rx, the interrupt > counts edges as it does with the pin as GPIO (452 vs 445 in 5 s). > U-Boot leaves the pin as GPIO. The PHY interrupt on this board is > described the same way, without pinctrl. Actually on Amlogic platforms the GPIO Interrup HW block directly gets the pin input directly from the pin, so the pin doesn't need to be set as input. Nevertheless, so be sure there's no remaining pull-up or pull-down remaining on the pin, it's safer to add a pinctrl mux node for the pin. Thamks, Neil > > Igor _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic