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Wed, 12 Mar 2025 03:43:54 -0700 (PDT) From: Chen-Yu Tsai To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Benson Leung , Tzung-Bi Shih , Dmitry Torokhov Cc: Chen-Yu Tsai , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, chrome-platform@lists.linux.dev, linux-input@vger.kernel.org, Douglas Anderson Subject: [PATCH 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan eKTH8D18 Date: Wed, 12 Mar 2025 18:43:35 +0800 Message-ID: <20250312104344.3084425-2-wenst@chromium.org> X-Mailer: git-send-email 2.49.0.rc0.332.g42c0ae87b1-goog In-Reply-To: <20250312104344.3084425-1-wenst@chromium.org> References: <20250312104344.3084425-1-wenst@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250312_034356_234248_3301AFA2 X-CRM114-Status: GOOD ( 11.77 ) 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 The Elan eKTH8D18 touchscreen controller is an I2C HID device with a longer boot-up time. Power sequence timing wise it is compatible with the eKTH6A12NAY, with a power-on delay of at least 5ms, 20ms out-of-reset for I2C ack response, and 150ms out-of-reset for I2C HID enumeration. Enumeration and subsequent operation follows the I2C HID standard. The eKTH6A12NAY requires longer times for both parts. Add a compatible string for it with the ekth6a12nay one as a fallback. Signed-off-by: Chen-Yu Tsai --- .../bindings/input/elan,ekth6915.yaml | 29 ++++++++++++++++--- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml index cb3e1801b0d3..81c391952ccc 100644 --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml @@ -4,14 +4,14 @@ $id: http://devicetree.org/schemas/input/elan,ekth6915.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# -title: Elan eKTH6915 touchscreen controller +title: Elan I2C-HID touchscreen controllers maintainers: - Douglas Anderson description: - Supports the Elan eKTH6915 touchscreen controller. - This touchscreen controller uses the i2c-hid protocol with a reset GPIO. + Supports the Elan eKTH6915 and other I2C-HID touchscreen controllers. + These touchscreen controller use the i2c-hid protocol with a reset GPIO. allOf: - $ref: /schemas/input/touchscreen/touchscreen.yaml# @@ -23,12 +23,18 @@ properties: - enum: - elan,ekth5015m - const: elan,ekth6915 + - items: + - enum: + - elan,ekth8d18 + - const: elan,ekth6a12nay - enum: - elan,ekth6915 - elan,ekth6a12nay reg: - const: 0x10 + enum: + - 0x10 + - 0x16 interrupts: maxItems: 1 @@ -58,6 +64,21 @@ required: - interrupts - vcc33-supply +if: + properties: + compatible: + contains: + enum: + - elan,ekth8d18 +then: + properties: + reg: + const: 0x16 +else: + properties: + reg: + const: 0x10 + additionalProperties: false examples: