Documentation: leds-lp5523: describe master fader attributes
Add the usage of the new attributes for master faders.
Signed-off-by: Toshi Kikuchi <toshik@chromium.org>
Acked-by: Milo Kim <milo.kim@ti.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
diff --git a/Documentation/leds/leds-lp5523.txt b/Documentation/leds/leds-lp5523.txt
index 5b3e91d4..0dbbd27 100644
--- a/Documentation/leds/leds-lp5523.txt
+++ b/Documentation/leds/leds-lp5523.txt
@@ -49,6 +49,36 @@
2) Firmware interface - LP55xx common interface
For the details, please refer to 'firmware' section in leds-lp55xx.txt
+LP5523 has three master faders. If a channel is mapped to one of
+the master faders, its output is dimmed based on the value of the master
+fader.
+
+For example,
+
+ echo "123000123" > master_fader_leds
+
+creates the following channel-fader mappings:
+
+ channel 0,6 to master_fader1
+ channel 1,7 to master_fader2
+ channel 2,8 to master_fader3
+
+Then, to have 25% of the original output on channel 0,6:
+
+ echo 64 > master_fader1
+
+To have 0% of the original output (i.e. no output) channel 1,7:
+
+ echo 0 > master_fader2
+
+To have 100% of the original output (i.e. no dimming) on channel 2,8:
+
+ echo 255 > master_fader3
+
+To clear all master fader controls:
+
+ echo "000000000" > master_fader_leds
+
Selftest uses always the current from the platform data.
Each channel contains led current settings.