The ili9882t touch screen chip same as Elan eKTH6915 controller
has a reset gpio. The difference is that ili9882t needs to use
vccio-supply instead of vcc33-supply. Doug's series[1] allows panels
and touchscreens to power on/off together, let's add a phandle for this.

[1]: https: //lore.kernel.org/all/20230523193017.4109557-1-dianders@chromium.org/

Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
---
 .../bindings/input/ilitek,ili9882t.yaml       | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml

diff --git a/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
new file mode 100644
index 000000000000..f69fa3aaf4c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/ilitek,ili9882t.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ilitek ili9882t touchscreen controller
+
+maintainers:
+  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+
+description:
+  Supports the Ilitek ili9882t touchscreen controller.
+  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
+
+properties:
+  compatible:
+    items:
+      - const: ilitek,ili9882t
+
+  reg:
+    const: 0x41
+
+  interrupts:
+    maxItems: 1
+
+  panel:
+    description: If this is a touchscreen, the panel it's connected to. This
+      indicates that the panel and touchscreen are expected to be power
+      sequenced together.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  reset-gpios:
+    description: Reset GPIO.
+
+
+  vccio-supply:
+    description: The 1.8V supply to the touchscreen.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - vccio-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      touchscreen: touchscreen@41 {
+        compatible = "ilitek,ili9882t";
+        reg = <0x41>;
+
+        interrupt-parent = <&pio>;
+        interrupts = <12 IRQ_TYPE_LEVEL_LOW>;
+
+        reset-gpios = <&pio 60 GPIO_ACTIVE_LOW>;
+        vccio-supply = <&mt6366_vio18_reg>;
+      };
+    };
-- 
2.25.1

On 07/06/2023 15:34, Cong Yang wrote:
> The ili9882t touch screen chip same as Elan eKTH6915 controller
> has a reset gpio. The difference is that ili9882t needs to use
> vccio-supply instead of vcc33-supply. Doug's series[1] allows panels
> and touchscreens to power on/off together, let's add a phandle for this.
> 
> [1]: https: //lore.kernel.org/all/20230523193017.4109557-1-dianders@chromium.org/
> 
> Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
> ---
>  .../bindings/input/ilitek,ili9882t.yaml       | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> new file mode 100644
> index 000000000000..f69fa3aaf4c5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/ilitek,ili9882t.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/ilitek,ili9882t.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ilitek ili9882t touchscreen controller
> +
> +maintainers:
> +  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
> +
> +description:
> +  Supports the Ilitek ili9882t touchscreen controller.
> +  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
> +
> +properties:
> +  compatible:
> +    items:

Drop items, just const.

> +      - const: ilitek,ili9882t
> +
> +  reg:
> +    const: 0x41
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  panel:
> +    description: If this is a touchscreen, the panel it's connected to. This
> +      indicates that the panel and touchscreen are expected to be power
> +      sequenced together.
> +    $ref: /schemas/types.yaml#/definitions/phandle

"If this is a touchscreen"? Doesn't you description say this is
touchscreen controller? Then how this could be also not a touchscreen?

> +
> +  reset-gpios:
> +    description: Reset GPIO.

missing maxItems


Best regards,
Krzysztof