[PATCH v2 7/7] Adding SKY81452 backlight document

[Gyungoh Yoo]

v2:
split the patches

---
 Documentation/backlight/sky81452-backlight.txt | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Documentation/backlight/sky81452-backlight.txt

diff --git a/Documentation/backlight/sky81452-backlight.txt b/Documentation/backlight/sky81452-backlight.txt
new file mode 100644
index 0000000..39f2f8c
--- /dev/null
+++ b/Documentation/backlight/sky81452-backlight.txt
@@ -0,0 +1,26 @@
+backlight driver for sky81452
+==========================
+
+* Skyworks Solutions SKY81452 :
+  High-Efficiency, Six-Channel White LED Driver with Touch Panel Bias Supply
+
+Description
+-----------
+The SKY81452 is a highly integrated, high-efficiency LED backlight solution for
+tablets, notebook computers, monitors, and other portable devices.
+
+The SKY81452 supports Direct Pulse Width Modulation(DPWM) dimming and Analog
+Pulse Width Modulation (APWM). In the DPWM dimming mode, the output waveform
+follows the Pulse Width Modulation Input(PWMI) signal and the current level is
+set by I2C control and an external RSET resistor. In the APWM mode, the PWMI
+signal duty and the I2C brightness control signal are multiplied to control
+the output current level.
+
+The driver exports some additional attributes for SKY81452 backlight.
+- enable : Current sink channels. Bit0 is for channel 1, Bit1 is for channel 2
+	and Bit2 is for channel 3. In same way, Bit5 is for channel 6.
+	For example, if 5 is written to this attribute, channel 1 and
+	channel 3 are enabled.
+- open : Shows an open LED fault.
+- short : Shows an short LED fault.
+- fault : Shows information about over-current and over-temperature.
-- 
1.9.1

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