linux-kernel - [PATCH v2] dt-bindings: input: Goodix SPI HID Touchscreen

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Message-ID: <20241107032313.64390-1-charles.goodix@gmail.com>
Date: Thu,  7 Nov 2024 11:23:13 +0800
From: Charles Wang <charles.goodix@...il.com>
To: krzk@...nel.org,
	hbarnor@...omium.org,
	dianders@...omium.org,
	conor.dooley@...rochip.com
Cc: dmitry.torokhov@...il.com,
	jikos@...nel.org,
	bentiss@...nel.org,
	linux-input@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Charles Wang <charles.goodix@...il.com>
Subject: [PATCH v2] dt-bindings: input: Goodix SPI HID Touchscreen

The Goodix GT7986U touch controller report touch data according to the
HID protocol through the SPI bus. However, it is incompatible with
Microsoft's HID-over-SPI protocol.

Signed-off-by: Charles Wang <charles.goodix@...il.com>
---
Changes in v2:
- Change compatible to 'goodix,gt7986u-spifw'.
- Remove 'goodix,hid-report-addr' property.
- Change additionalProperties to unevaluatedProperties.
- v1: https://lore.kernel.org/all/20241025114642.40793-2-charles.goodix@gmail.com/
---
 .../bindings/input/goodix,gt7986u.yaml        | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/goodix,gt7986u.yaml

diff --git a/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
new file mode 100644
index 000000000..b7afa21fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/goodix,gt7986u.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Goodix GT7986U SPI HID Touchscreen
+
+maintainers:
+  - Charles Wang <charles.goodix@...il.com>
+
+description: Supports the Goodix GT7986U touchscreen.
+  This touch controller reports data packaged according to the HID protocol
+  over the SPI bus, but it is incompatible with Microsoft's HID-over-SPI protocol.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    description:
+      Add the 'spifw' suffix to distinguish it from the general GT7986U I2C-HID
+      touchscreen, as it runs a substantially different firmware than GT7986U
+      I2C-HID touchscreens.
+    enum:
+      - goodix,gt7986u-spifw
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  spi-max-frequency: true
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - reset-gpios
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      touchscreen@0 {
+        compatible = "goodix,gt7986u-spifw";
+        reg = <0>;
+        interrupt-parent = <&gpio>;
+        interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
+        reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
+        spi-max-frequency = <10000000>;
+      };
+    };
+
+...
-- 
2.43.0