[PATCH v6 2/4] dt-bindings: input: Add Cypress TT2100 touchscreen controller

[Alistair Francis]

Add the Cypress TrueTouch Generation 5 touchscreen device tree bindings
documentation. It can use I2C or SPI bus.
This touchscreen can handle some defined zone that are designed and
sent as button. To be able to customize the keycode sent, the
"linux,code" property in a "button" sub-node can be used.

Signed-off-by: Alistair Francis <alistair at alistair23.me>
Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
---
 .../input/touchscreen/cypress,tt21000.yaml    | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml

diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
new file mode 100644
index 000000000000..12a9c13f7706
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
@@ -0,0 +1,98 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/cypress,tt21000.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cypress TT2100 touchscreen controller
+
+description: The Cypress TT2100 series (also known as "CYTTSP5" after
+  the marketing name Cypress TrueTouch Standard Product series 5).
+
+maintainers:
+  - Alistair Francis <alistair at alistair23.me>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    const: cypress,tt21000
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Regulator for voltage.
+
+  reset-gpios:
+    maxItems: 1
+
+  linux,keycodes:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: EV_ABS specific event code generated by the axis.
+
+patternProperties:
+  "^button@[0-9]+$":
+    type: object
+    properties:
+      reg:
+        maxItems: 1
+      linux,keycodes:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Keycode to emit
+
+    required:
+      - reg
+      - linux,keycodes
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - vdd-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/input/linux-event-codes.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen at 24 {
+            compatible = "cypress,tt21000";
+            reg = <0x24>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&tp_reset_ds203>;
+            interrupt-parent = <&pio>;
+            interrupts = <1 5 IRQ_TYPE_LEVEL_LOW>;
+            reset-gpios = <&pio 7 1 GPIO_ACTIVE_LOW>;
+            vdd-supply = <&reg_touch>;
+
+            button at 0 {
+                reg = <0>;
+                linux,keycodes = <KEY_HOMEPAGE>;
+            };
+
+            button at 1 {
+                reg = <1>;
+                linux,keycodes = <KEY_MENU>;
+            };
+
+            button at 2 {
+                reg = <2>;
+                linux,keycodes = <KEY_BACK>;
+            };
+        };
+    };
+...
-- 
2.34.1