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In order to support the "enable GPIO" available in many panel devices, this commit adds a proper devicetree binding. By providing an enable GPIO in the devicetree, the driver can now turn off and on the panel device, and/or the backlight device. Both the backlight and the GPIO are optional properties. Tested-by: Darren Etheridge <[email protected]> Tested-by: Johannes Pointner <[email protected]> Signed-off-by: Ezequiel Garcia <[email protected]> Signed-off-by: Dave Airlie <[email protected]>