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generic: add STMicroelectronics LED1202 driver

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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>
This commit is contained in:
Manuel Fombuena
2025-01-01 20:42:37 +00:00
committed by Robert Marko
parent 70610a5240
commit 8925c469f4
6 changed files with 716 additions and 5 deletions
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4
target/linux/mediatek/patches-6.6/950-smartrg-i2c-led-driver.patch
View File

@@ -5,7 +5,7 @@
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -901,6 +901,16 @@ source "drivers/leds/flash/Kconfig"
@@ -911,6 +911,16 @@ source "drivers/leds/flash/Kconfig"
comment "RGB LED drivers"
source "drivers/leds/rgb/Kconfig"
@@ -29,6 +29,6 @@
obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
+obj-$(CONFIG_LEDS_SMARTRG_LED) += leds-smartrg-system.o
obj-$(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