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Tue, 01 Sep 2026 00:50:15 -0700 (PDT) Received: from wenst-7875.tpe.corp.google.com ([2a00:79e0:201d:8:8cf:6df0:9c4e:f5e1]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d75988b699sm48142515ad.59.2026.09.01.00.50.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2026 00:50:15 -0700 (PDT) From: Chen-Yu Tsai To: Mark Brown , Matthias Brugger , AngeloGioacchino Del Regno , Dmitry Torokhov , Jiri Kosina , Andi Shyti Cc: Chen-Yu Tsai , Benson Leung , Tzung-Bi Shih , linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, chrome-platform@lists.linux.dev, linux-input@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, stable+noautosel@kernel.org Subject: [PATCH v6 7/8] arm64: dts: mediatek: mt8173-elm-hana: Unmark trackpad supply as always-on Date: Tue, 1 Sep 2026 15:49:25 +0800 Message-ID: <20260901074930.764550-8-wenst@chromium.org> X-Mailer: git-send-email 2.55.0.897.gb25b4bd76c-goog In-Reply-To: <20260901074930.764550-1-wenst@chromium.org> References: <20260901074930.764550-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Up until now, the MT8173 elm/hana device tree has set the dedicated regulator supplying the trackpad as always-on, simply because the Elan driver was missing proper delays. As a result the delay for the Synaptics trackpad was also omitted, as it was not strictly required under such a model and delayed the availability of the trackpad to the user. The Elan driver recently gained proper delays after power up, with opportunistic skipping of the delay when the regulator was originally on. The I2C HID driver gained similar opportunistic delay skipping. So has the I2C OF component prober library. Now fix the device tree to have the regulator not be always on, and let the I2C HID device have the correct post-power-on delay time. Cc: # needs matching driver changes Signed-off-by: Chen-Yu Tsai --- Changes since v5: - Added noautosel tag --- arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 8 +------- arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 1 - 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi index 1004eb8ea52c..b9e311fcd9a0 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi @@ -62,13 +62,7 @@ trackpad2: trackpad@2c { pinctrl-0 = <&trackpad_irq>; reg = <0x2c>; hid-descr-addr = <0x0020>; - /* - * The trackpad needs a post-power-on delay of 100ms, - * but at time of writing, the power supply for it on - * this board is always on. The delay is therefore not - * added to avoid impacting the readiness of the - * trackpad. - */ + post-power-on-delay-ms = <100>; vdd-supply = <&mt6397_vgp6_reg>; wakeup-source; status = "fail-needs-probe"; diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi index a0573bc359fb..6b9f47f515c7 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi @@ -1093,7 +1093,6 @@ mt6397_vgp6_reg: ldo_vgp6 { regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; regulator-enable-ramp-delay = <218>; - regulator-always-on; }; mt6397_vibr_reg: ldo_vibr { -- 2.55.0.897.gb25b4bd76c-goog