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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>
hifive-unleashed-5.1
Toshi Kikuchi 2015-05-12 18:15:14 -07:00 committed by Bryan Wu
parent 52da81eafa
commit 7ff6b23251
1 changed files with 30 additions and 0 deletions
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Documentation/leds/leds-lp5523.txt
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@ -49,6 +49,36 @@ There are two ways to run LED patterns.
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.