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drm/panel: Add support for the Raspberry Pi 7" Touchscreen.
This driver communicates with the Atmel microcontroller for sequencing the poweron of the TC358762 DSI-DPI bridge and controlling the backlight PWM. The following lines are required in config.txt, to keep the firmware from trying to bash our I2C lines and steal the DSI interrupts: disable_touchscreen=1 ignore_lcd=2 mask_gpu_interrupt1=0x1000 This means that the firmware won't power on the panel at boot time (no rainbow) and the touchscreen input won't work. The native input driver for the touchscreen still needs to be written. v2: Set the same default orientation as the closed source firmware used, which is the best for viewing angle. Signed-off-by: Eric Anholt <eric@anholt.net>
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