dts: bindings: auxdisplay: Add TM1637 binding

Add device tree binding for TitanMicro TM1637 7-segment LED
display controller. The TM1637 uses a GPIO bit-banging protocol
with clock and data pins.

Properties:
- clk-gpios: Clock GPIO pin
- dio-gpios: Data I/O GPIO pin
- bit-delay-us: Bit delay for GPIO protocol timing

Signed-off-by: Siratul Islam <[email protected]>

Author: heronet

dts/bindings/auxdisplay/titanmicro,tm1637.yaml

@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Siratul Islam
+
+description: TM1637 7-segment LED display controller
+
+compatible: "titanmicro,tm1637"
+
+include: base.yaml
+
+properties:
+  clk-gpios:
+    type: phandle-array
+    required: true
+    description: Clock GPIO pin
+
+  dio-gpios:
+    type: phandle-array
+    required: true
+    description: Data I/O GPIO pin
+
+  bit-delay-us:
+    type: int
+    default: 100
+    description: |
+      Bit delay in microseconds for GPIO bit-banging protocol.
+      TM1637 datasheet specifies minimum timings of 100ns (setup/hold)
+      and 400ns (clock pulse width). Default of 100µs provides safe
+      margin for software GPIO operations across different platforms.

dts/bindings/vendor-prefixes.txt

@@ -690,6 +690,7 @@ thine	THine Electronics, Inc.
 thingyjp	thingy.jp
 ti	Texas Instruments
 tianma	Tianma Micro-electronics Co., Ltd.
+titanmicro	Shenzhen Titan Micro Electronics Co., Ltd.
 tlm	Trusted Logic Mobility
 tmt	Tecon Microprocessor Technologies, LLC.
 topeet	Topeet