Linux Driver for LP8550 LP8550SW-LINUX (ACTIVE)

Description & Features

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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 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  : tristate
Prompt: Backlight driver for TI LP855X
    -> 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 this
driver please either

1. Send the patches to the relevant Linux Kernel community as listed in the maintainers file located: Here


2.  Contact your TI representative.


TI Devices (7)

Part Number Name Product Family
LP8550  High-Efficiency LED Backlight Driver for Notebooks  LED drivers 
LP8551  High-Efficiency LED Backlight Driver for Notebooks  LED drivers 
LP8552  High-Efficiency LED Backlight Driver for Notebooks  LED drivers 
LP8553  High-Efficiency LED Backlight Driver for Notebooks  LED drivers 
LP8555  High-Efficiency LED Backlight Driver for Tablet PCs  LED drivers 
LP8556  6 Channel High-Efficiency/Efficacy LED Backlight Driver  LED drivers 
LP8557  High-Efficiency LED Backlight Driver for Tablets  LED drivers 

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