linux-kernel - [PATCH 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan eKTH8D18

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Message-ID: <20250312104344.3084425-2-wenst@chromium.org>
Date: Wed, 12 Mar 2025 18:43:35 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Benson Leung <bleung@...omium.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	chrome-platform@...ts.linux.dev,
	linux-input@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>
Subject: [PATCH 1/8] dt-bindings: HID: i2c-hid: elan: Introduce Elan eKTH8D18

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@...omium.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@...omium.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:
-- 
2.49.0.rc0.332.g42c0ae87b1-goog