Add Device Tree bindings for RAVE SP backlihgt drvier - an MFD cell of
parent RAVE SP driver (documented in
Documentation/devicetree/bindings/mfd/zii,rave-sp.txt).

Cc: Lee Jones <lee.jo...@linaro.org>
Cc: Daniel Thompson <daniel.thomp...@linaro.org>
Cc: Jingoo Han <jingooh...@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: Chris Healy <cphe...@gmail.com>
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Aleksander Morgado <aleksan...@aleksander.es>
Cc: Rob Herring <robh...@kernel.org>
Cc: Mark Rutland <mark.rutl...@arm.com>
Cc: devicet...@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
---
 .../leds/backlight/zii,rave-sp-backlight.txt       | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/leds/backlight/zii,rave-sp-backlight.txt

diff --git 
a/Documentation/devicetree/bindings/leds/backlight/zii,rave-sp-backlight.txt 
b/Documentation/devicetree/bindings/leds/backlight/zii,rave-sp-backlight.txt
new file mode 100644
index 000000000000..2eba8322fc28
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/zii,rave-sp-backlight.txt
@@ -0,0 +1,23 @@
+Zodiac Inflight Innovations RAVE Supervisory Processor Backlight Bindings
+
+RAVE SP backlight device is a "MFD cell" device corresponding to
+backlight functionality of RAVE Supervisory Processor. It is expected
+that its Device Tree node is specified as a child of the node
+corresponding to the parent RAVE SP device (as documented in
+Documentation/devicetree/bindings/mfd/zii,rave-sp.txt)
+
+Required properties:
+
+- compatible: Should be "zii,rave-sp-backlight"
+
+Example:
+
+       rave-sp {
+               compatible = "zii,rave-sp-rdu1";
+               current-speed = <38400>;
+
+               pwrbutton {
+                       compatible = "zii,rave-sp-backlight";
+               };
+       }
+
-- 
2.14.3

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