[PATCH 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan eKTH8D18
From: Chen-Yu Tsai <wenst@chromium.org>
Date: 2025-03-12 10:43:55
Also in:
chrome-platform, linux-arm-kernel, linux-devicetree, linux-mediatek, lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Dmitry Torokhov, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <wenst@chromium.org> --- .../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 <dianders@chromium.org> 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:
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2.49.0.rc0.332.g42c0ae87b1-goog