leds: Add LED1202 I2C driver

The output current can be adjusted separately for each channel by 8-bit
analog (current sink input) and 12-bit digital (PWM) dimming control. The
LED1202 implements 12 low-side current generators with independent dimming
control.
Internal volatile memory allows the user to store up to 8 different patterns,
each pattern is a particular output configuration in terms of PWM
duty-cycle (on 4096 steps). Analog dimming (on 256 steps) is per channel but
common to all patterns. Each device tree LED node will have a corresponding
entry in /sys/class/leds with the label name. The brightness property
corresponds to the per channel analog dimming, while the patterns[1-8] to the
PWM dimming control.

Signed-off-by: Vicentiu Galanopulo <vicentiu.galanopulo@remote-tech.co.uk>
Link: https://lore.kernel.org/r/20241218182001.41476-4-vicentiu.galanopulo@remote-tech.co.uk
Signed-off-by: Lee Jones <lee@kernel.org>

Author: vicgal-remtech

drivers/leds/Kconfig

@@ -942,6 +942,16 @@ config LEDS_LM36274
 	  Say Y to enable the LM36274 LED driver for TI LMU devices.
 	  This supports the LED device LM36274.
 
+config LEDS_ST1202
+	tristate "LED Support for STMicroelectronics LED1202 I2C chips"
+	depends on LEDS_CLASS
+	depends on I2C
+	depends on OF
+	select LEDS_TRIGGERS
+	help
+	  Say Y to enable support for LEDs connected to LED1202
+	  LED driver chips accessed via the I2C bus.
+
 config LEDS_TPS6105X
 	tristate "LED support for TI TPS6105X"
 	depends on LEDS_CLASS