linux-kernel - [PATCH v5 1/2] dt-bindings: input: i2c-hid: Introduce FocalTech FT8112

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Message-Id: <20251117110148.v5.1.I894dde5015f4acad94cb5bada61e5811c5142395@changeid>
Date: Mon, 17 Nov 2025 11:02:10 +0800
From: daniel_peng@...atron.corp-partner.google.com
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
	Daniel Peng <Daniel_Peng@...atron.corp-partner.google.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Rob Herring <robh@...nel.org>,
	devicetree@...r.kernel.org
Subject: [PATCH v5 1/2] dt-bindings: input: i2c-hid: Introduce FocalTech FT8112

From: Daniel Peng <Daniel_Peng@...atron.corp-partner.google.com>

Create new binding file for the FocalTech FT8112 due to new touchscreen chip.
Confirm its compatible, reg for the device via vendor, and set the interrupt
and reset gpio to map for Skywalker platform.
FocalTech FT8112 also uses vcc33/vccio power supply.

Signed-off-by: Daniel Peng <Daniel_Peng@...atron.corp-partner.google.com>
> > From: Daniel Peng <Daniel_Peng@...atron.corp-partner.google.com>
> >
> > The FocalTech FT8112 touch screen chip same as Ilitek ili2901 controller
>
> So keep the device in that binding under enum. No need to create
> document for every device, even if they were different but here it is
> pretty obvious - same chip.
>
> Best regards,
> Krzysztof

Re-describe the commit message to make more clear why to create new document
for FocalTech FT8112 device.
Sorry for the confusion.

---

Changes in v5:
- Modified the commit description clearly.

 .../bindings/input/focaltech,ft8112.yaml      | 66 +++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/focaltech,ft8112.yaml

diff --git a/Documentation/devicetree/bindings/input/focaltech,ft8112.yaml b/Documentation/devicetree/bindings/input/focaltech,ft8112.yaml
new file mode 100644
index 000000000000..197f30b14d45
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/focaltech,ft8112.yaml
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/focaltech,ft8112.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: FocalTech FT8112 touchscreen controller
+
+maintainers:
+  - Daniel Peng <Daniel_Peng@...atron.corp-partner.google.com>
+
+description:
+  Supports the FocalTech FT8112 touchscreen controller.
+  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
+
+allOf:
+  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
+
+properties:
+  compatible:
+    enum:
+      - focaltech,ft8112
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  panel: true
+
+  reset-gpios:
+    maxItems: 1
+
+  vcc33-supply: true
+
+  vccio-supply: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - vcc33-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@38 {
+        compatible = "focaltech,ft8112";
+        reg = <0x38>;
+
+        interrupt-parent = <&pio>;
+        interrupts = <15 IRQ_TYPE_LEVEL_LOW>;
+
+        reset-gpios = <&pio 126 GPIO_ACTIVE_LOW>;
+        vcc33-supply = <&pp3300_tchscr_x>;
+      };
+    };
-- 
2.34.1