[PATCH v4 1/2] dt-bindings: input: add OnePlus pogo-pin keyboard

[wyibo6109@gmail.com]

From: Yibo Wang <wyibo6109@gmail.com>

Binding for the OnePlus Pad 3 Pro / Pad 4 and OPPO Pad 5 Pro pogo-pin
smart keyboards, built around a Tinno keyboard MCU and attached to a
tablet UART.  Describes the supply, TX-gate and wake GPIOs, with a
MAINTAINERS entry.

The compatible names the tablet project the pogo port belongs to
(caihong, erhai or iceland), which pins the keyboard generation and
with it the protocol extensions the host may use: the 0x3A general
sub-commands grew over time, from the caihong (sm8650 era) keyboards
with neither wake notification nor backlight, through erhai (sm8750
era, wake notification) to iceland (sm8850 era, keyboard backlight).

The keyboard is a fixed physical device, so the touchpad geometry and
the product names are per-project constants and live in the driver;
the common touchscreen properties (touchscreen-size-x/y,
touchscreen-x-mm/y-mm) remain as an optional override if a variant
ever needs one.

Signed-off-by: Yibo Wang <wyibo6109@gmail.com>
---
 .../bindings/input/oneplus,pogo-keyboard.yaml | 73 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml

diff --git a/Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml b/Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml
new file mode 100644
index 000000000..bab9ff3d3
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2026 Yibo Wang <wyibo6109@gmail.com>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/oneplus,pogo-keyboard.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: OnePlus / OPPO Pad pogo-pin smart keyboard
+
+maintainers:
+  - Yibo Wang <wyibo6109@gmail.com>
+
+description: |
+  The OnePlus Pad 3 Pro / Pad 4 and OPPO Pad 5 Pro pogo-pin smart
+  keyboards, built around a Tinno keyboard MCU.  The keyboard is
+  attached to a tablet UART and speaks a framed half-duplex protocol
+  over a shared single wire; host transmission is gated onto the wire
+  by a PMIC GPIO for the duration of a frame.  It provides a keyboard
+  matrix, a touchpad and a keyboard backlight.
+
+allOf:
+  - $ref: /schemas/serial/serial-peripheral-props.yaml#
+  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
+
+properties:
+  compatible:
+    description: |
+      Names the tablet project the pogo port belongs to, which pins the
+      keyboard generation and the protocol extensions the host may
+      use: caihong (sm8650 era) supports neither the wake notification
+      nor a backlight, erhai (sm8750 era) adds the wake notification,
+      iceland (sm8850 era) adds the keyboard backlight.
+    enum:
+      - oneplus,caihong-pogo-keyboard
+      - oneplus,erhai-pogo-keyboard
+      - oneplus,iceland-pogo-keyboard
+
+  power-gpios:
+    description: GPIO enabling the keyboard supply, held high while attached.
+    maxItems: 1
+
+  tx-enable-gpios:
+    description: GPIO gating host TX onto the shared one-wire bus.
+    maxItems: 1
+
+  wake-gpios:
+    description: GPIO signalling attach/detach, also used as the wake line.
+    maxItems: 1
+
+  touchscreen-size-x: true
+  touchscreen-size-y: true
+  touchscreen-x-mm: true
+  touchscreen-y-mm: true
+
+required:
+  - compatible
+  - power-gpios
+  - tx-enable-gpios
+  - wake-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    keyboard {
+        compatible = "oneplus,iceland-pogo-keyboard";
+        power-gpios = <&pmic_gpios 12 GPIO_ACTIVE_HIGH>;
+        tx-enable-gpios = <&pmic2_gpios 6 GPIO_ACTIVE_HIGH>;
+        wake-gpios = <&tlmm 151 GPIO_ACTIVE_LOW>;
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 8014b9f82..9c29eb961 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20156,6 +20156,12 @@ S:	Maintained
 F:	Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-dev
 F:	drivers/usb/misc/onboard_usb_dev.c
 
+ONEPLUS POGO-PIN KEYBOARD DRIVER
+M:	Yibo Wang <wyibo6109@gmail.com>
+L:	linux-input@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/input/oneplus,pogo-keyboard.yaml
+
 ONENAND FLASH DRIVER
 M:	Kyungmin Park <kyungmin.park@samsung.com>
 L:	linux-mtd@lists.infradead.org
-- 
2.53.0