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Author SHA1 Message Date
Oleksandr Tymoshenko
26c36284a9 Use GPIO pin management API in gpiobacklight 
- Get rid of hack with re-parenting gpio-leds node to gpiobus
- Use gpio_pin_set_active to enable/disable backlight, it automatically
    takes care of active-low pins
 2016-05-11 00:26:52 +00:00
Oleksandr Tymoshenko
40ebf1626f Add GPIO backlight driver compatible with Linux FDT bindings. 
Brightness is controlled through sysctl dev.gpiobacklight.X.brightness:
  - any value greater than 0: backlight is on
  - any value less than or equal to  0: backlight is off

FDT bindings docs in Linux tree:
    Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
 2015-07-30 19:04:14 +00:00