dt-bindings: mfd: LMU: Add ti,brightness-resolution

Add ti,brightness-resolution to the TI LMU binding to define
whether the device uses 8-bit brightness or 11-bit brightness.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

diff --git a/Documentation/devicetree/bindings/mfd/ti-lmu.txt b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
index 160eb0a..e3efefb 100644 (file)
--- a/Documentation/devicetree/bindings/mfd/ti-lmu.txt
+++ b/Documentation/devicetree/bindings/mfd/ti-lmu.txt
@@ -31,6 +31,16 @@ Optional properties:
   - ramp-down-us: Current ramping from one brightness level to
                  the a lower brightness level.
                  Range from 2048 us - 117.44 s
+  - ti,brightness-resolution - This determines whether to use 8 bit brightness
+                              mode or 11 bit brightness mode.  If this value is
+                              not set the device is defaulted to the preferred
+                              8bit brightness mode per 7.3.4.1 of the data
+                              sheet.  This setting can either be in the parent
+                              node or as part of the LED child nodes.  This
+                              is determined by the part itself if the strings
+                              have a common brightness register or individual
+                              brightness registers.
+                              The values are 255 (8bit) or 2047 (11bit).
 
 Required node:
   - backlight: All LMU devices have backlight child nodes.
@@ -217,6 +227,7 @@ lm3697@36 {
                compatible = "ti,lm3697-backlight";
 
                lcd {
+                       ti,brightness-resolution = <255>;
                        led-sources = <0 1 2>;
                        ramp-up-us = <200000>;
                        ramp-down-us = <200000>;