leds: sun50i-a100: New driver for the A100 LED controller

Some Allwinner sunxi SoCs, starting with the A100, contain an LED
controller designed to drive RGB LED pixels. Add a driver for it using
the multicolor LED framework, and with LEDs defined in the device tree.
Acked-by: Guo Ren <guoren@kernel.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20231029212738.7871-3-samuel@sholland.orgSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/Kconfig

@@ -298,6 +298,15 @@ config LEDS_COBALT_RAQ
 	help
 	  This option enables support for the Cobalt Raq series LEDs.
 
+config LEDS_SUN50I_A100
+	tristate "LED support for Allwinner A100 RGB LED controller"
+	depends on LEDS_CLASS_MULTICOLOR && OF
+	depends on ARCH_SUNXI || COMPILE_TEST
+	help
+	  This option enables support for the RGB LED controller found
+	  in some Allwinner sunxi SoCs, including A100, R329, and D1.
+	  It uses a one-wire interface to control up to 1024 LEDs.
+
 config LEDS_SUNFIRE
 	tristate "LED support for SunFire servers."
 	depends on LEDS_CLASS

drivers/leds/Makefile

@@ -78,6 +78,7 @@ obj-$(CONFIG_LEDS_POWERNV)		+= leds-powernv.o
 obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
 obj-$(CONFIG_LEDS_REGULATOR)		+= leds-regulator.o
 obj-$(CONFIG_LEDS_SC27XX_BLTC)		+= leds-sc27xx-bltc.o
+obj-$(CONFIG_LEDS_SUN50I_A100)		+= leds-sun50i-a100.o
 obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
 obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
 obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o