generic: add STMicroelectronics LED1202 driver

This LED controller has a driver under development which is currently being reviewed by the respective kernel maintainers. They are currently on v11 which is included here.

The LED1202 is a 12-channel low quiescent current LED driver with:
  * Supply range from 2.6 V to 5 V
  * 20 mA current capability per channel
  * 1.8 V compatible I2C control interface
  * 8-bit analog dimming individual control
  * 12-bit local PWM resolution
  * 8 programmable patterns

If the led node is present in the controller then the channel is
set to active.

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: Manuel Fombuena <fombuena@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/17451
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/bmips/patches-6.6/700-leds-add-support-for-Sercomm-MSP430-LED-controller.patch

@@ -40,6 +40,6 @@ Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  obj-$(CONFIG_LEDS_REGULATOR)		+= leds-regulator.o
  obj-$(CONFIG_LEDS_SC27XX_BLTC)		+= leds-sc27xx-bltc.o
 +obj-$(CONFIG_LEDS_SERCOMM_MSP430)	+= leds-sercomm-msp430.o
+ obj-$(CONFIG_LEDS_ST1202)		+= leds-st1202.o
  obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
  obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
- obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o