drivers: led: Add TM1637 7-segment display driver

Add support for TM1637 4-digit 7-segment LED displays with clock and
data pin interface. The driver supports:

- Display decimal numbers with leading zero control
- Dot/colon control for time displays
- Adjustable brightness
- Partial display updates

The driver implements the standard LED API and provides
TM1637-specific extensions.

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

Author: heronet

drivers/led/CMakeLists.txt

@@ -15,6 +15,7 @@ zephyr_library_sources_ifdef(CONFIG_LED_DAC led_dac.c)
 zephyr_library_sources_ifdef(CONFIG_LED_GPIO led_gpio.c)
 zephyr_library_sources_ifdef(CONFIG_LED_NPM13XX led_npm13xx.c)
 zephyr_library_sources_ifdef(CONFIG_LED_PWM led_pwm.c)
+zephyr_library_sources_ifdef(CONFIG_LED_TM1637 tm1637.c)
 zephyr_library_sources_ifdef(CONFIG_LED_XEC led_mchp_xec.c)
 zephyr_library_sources_ifdef(CONFIG_LP3943 lp3943.c)
 zephyr_library_sources_ifdef(CONFIG_LP50XX lp50xx.c)

drivers/led/Kconfig

@@ -46,6 +46,7 @@ source "drivers/led/Kconfig.pca9533"
 source "drivers/led/Kconfig.pca9633"
 source "drivers/led/Kconfig.pwm"
 source "drivers/led/Kconfig.tlc59108"
+source "drivers/led/Kconfig.tm1637"
 source "drivers/led/Kconfig.xec"
 # zephyr-keep-sorted-stop
 

drivers/led/Kconfig.tm1637

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2025 Siratul Islam
+
+config LED_TM1637
+	bool "Titan Micro TM1637 LED driver"
+	depends on GPIO
+	help
+		Enable driver for TM(Shenzhen Titan Micro Elec) TM1637 7-segment LED display.
+		This driver supports 4-digit 7-segment displays commonly
+		found in clock modules and simple numeric displays.
+
+		The TM1637 uses a two-wire serial interface (CLK and DIO)
+		and can control up to 4 digits with brightness control.