适用于 LP8550 的 Linux 驱动程序



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.


背光 LED 驱动器
LP8550 用于笔记本电脑的高效 LED 背光驱动器 LP8551 适用于笔记本电脑的四通道高效 LED 背光驱动器,具有 VDDIO PWM 逻辑电平 LP8552 适用于笔记本电脑的六通道高效 LED 背光驱动器,采用 BGA 封装 LP8553 适用于笔记本电脑的四通道高效 LED 背光驱动器,具有 3.3V PWM 逻辑电平 LP8555 适用于平板电脑的高效 LED 背光驱动器 LP8556 6 通道高效 LED 背光驱动器 LP8557 适用于平板电脑的高效 LED 背光驱动器
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