Linux Driver for LP8550



The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.


Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lp8550
  • lp8551
  • lp8552
  • lp8553
  • lp8555
  • lp8556
  • lp8557


Linux Source Files

The files associated with this device are:

  1. drivers/video/backlight/lp855x_bl.c
  2. Documentation/devicetree/bindings/leds/backlight/lp855x.txt
  3. include/linux/platform_data/lp855x.h

Source Files


Linux Device Tree Documenation


Other Files



Enabling Driver Support

Configure kernel with "make menuconfig" (alternatively use "make xconfig" or "make nconfig")

Menuconfig Location

Symbol: BACKLIGHT_LP855X [=y]Type  : tristatePrompt: Backlight driver for TI LP855X  Location:    -> Device Drivers      -> Graphics support        -> Backlight & LCD device support (BACKLIGHT_LCD_SUPPORT [=y])          -> Lowlevel Backlight controls (BACKLIGHT_CLASS_DEVICE [=y])  Defined at drivers/video/backlight/Kconfig:393  Depends on: HAS_IOMEM [=y] && BACKLIGHT_LCD_SUPPORT [=y] && BACKLIGHT_CLASS_DEVICE [=y] && I2C [=y] && PWM [=y]

Fixes and Code Enhancements

If there are fixes and or code enhancements that need to be added to thisdriver please either1. Send the patches to the relevant Linux Kernel community as listed in the maintainers file located: Hereor2.  Contact your TI representative.


Backlight LED drivers
LP8550 High-Efficiency LED Backlight Driver for Notebooks LP8551 Four channel high-efficiency LED backlight driver for notebooks with VDDIO PWM logic level LP8552 Six channel high-efficiency LED backlight driver for notebooks with BGA package LP8553 Four channel high-efficiency LED backlight driver for notebooks with 3.3V PWM logic level LP8555 High-efficiency LED backlight driver for Tablet PCs LP8556 6 channel high-efficiency/Efficacy LED backlight driver LP8557 High-efficiency LED backlight driver for Tablets

Support & training

TI E2E™ forums with technical support from TI engineers

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