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This chip controls the keyboard backlight. The backlight level is set through PWM, but the chip needs to be enabled and configured before PWM settings are recognized. This will be initially used for grunt and zoombini. BUG=b:69379749 BRANCH=none TEST=In EC console for grunt: kblight 100; kblight 0 Change-Id: I5576d709687d8f61b5757485baa239ffd6b41a74 Signed-off-by: Benjamin Gordon <bmgordon@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/879082 Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Edward Hill <ecgh@chromium.org>