Jani spotted this when reviewing my earlier patch to remove the driver
internal usage of this field in

commit 3cf91adaa594e8933af1727942ac560e5c7bc70e
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date:   Wed Apr 25 19:42:52 2018 +0200

    backlight: Nuke BL_CORE_DRIVER1

Cc: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Cc: Lee Jones <lee.jo...@linaro.org>
Cc: Daniel Thompson <daniel.thomp...@linaro.org>
Cc: Jingoo Han <jingooh...@gmail.com>
---
 include/linux/backlight.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 7fbf0539e14a..0b5897446dca 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -79,7 +79,6 @@ struct backlight_properties {
        /* Backlight type */
        enum backlight_type type;
        /* Flags used to signal drivers of state changes */
-       /* Upper 4 bits are reserved for driver internal use */
        unsigned int state;
 
 #define BL_CORE_SUSPENDED      (1 << 0)        /* backlight is suspended */
-- 
2.17.0

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