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Some touch controllers have to be powered on after the panel's backlight is enabled. To support these controllers, introduce .panel_enabled() and .panel_disabling() to panel_follower_funcs and use them to power on the device after the panel and its backlight are enabled. Signed-off-by: Pin-yen Lin <treapking@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20250818115015.2909525-1-treapking@chromium.org