[PATCH 5/7] dt-bindings: input: touchscreen: edt-ft5x06: Add FocalTech FT8722

[Luka Panio]

The FT8722 is a touch and display driver (TDDI) whose touch controller
is connected over SPI and runs its firmware from RAM. Document its
compatible, allow the SPI peripheral properties and add a
firmware-name property for the firmware to download at power up.

The "-ts" suffix keeps the compatible distinct from the one of the
display side of the same chip, which is a separate DSI device. The
reset GPIO is required, as the firmware can only be downloaded while
the boot ROM is running right after a reset.

Signed-off-by: Luka Panio <lukapanio@xxxxxxxxx>
---
 .../input/touchscreen/edt-ft5x06.yaml         | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
index 68b2f1601654..51d22ff42675 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
@@ -19,6 +19,7 @@ maintainers:
 
 allOf:
   - $ref: touchscreen.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
   - if:
       properties:
         compatible:
@@ -30,6 +31,17 @@ allOf:
       properties:
         offset-x: true
         offset-y: true
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: focaltech,ft8722-ts
+    then:
+      required:
+        - reset-gpios
+    else:
+      properties:
+        firmware-name: false
 
 properties:
   compatible:
@@ -47,6 +59,7 @@ properties:
           - focaltech,ft8201
           - focaltech,ft8716
           - focaltech,ft8719
+          - focaltech,ft8722-ts
       - items:
           - const: focaltech,ft3519
           - const: focaltech,ft3518
@@ -60,6 +73,12 @@ properties:
   reset-gpios:
     maxItems: 1
 
+  firmware-name:
+    maxItems: 1
+    description:
+      Firmware to download at power up, for controllers that run their
+      firmware from RAM, such as the FT8722.
+
   wake-gpios:
     maxItems: 1
 
@@ -134,5 +153,23 @@ examples:
         wake-gpios = <&gpio4 9 GPIO_ACTIVE_HIGH>;
       };
     };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      touchscreen@0 {
+        compatible = "focaltech,ft8722-ts";
+        reg = <0>;
+        spi-max-frequency = <6000000>;
+        interrupt-parent = <&tlmm>;
+        interrupts = <81 IRQ_TYPE_EDGE_FALLING>;
+        reset-gpios = <&tlmm 105 GPIO_ACTIVE_LOW>;
+        firmware-name = "qcom/qcm6490/nexphone/ft8722.bin";
+        touchscreen-size-x = <1080>;
+        touchscreen-size-y = <2408>;
+      };
+    };
 
 ...
-- 
2.55.0