Add device tree binding documentation for On Semiconductor NCP5623 I2C
LED driver. The driver can independently control the PWM of the 3
channels with 32 levels of intensity.
The current delivered by the current source can be controlled using the
led-max-microamp property. In order to control this value, it is also
necessary to know the current on the Iref pin, hence the
onnn,led-iref-microamp property. It is usually set using an external
bias resistor, following Iref = Vref/Rbias with Vref=0.6V.
Signed-off-by: Florian Vaussard <florian.vaussard@xxxxxxxxxx>
---
.../devicetree/bindings/leds/leds-ncp5623.txt | 44 ++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-ncp5623.txt
diff --git a/Documentation/devicetree/bindings/leds/leds-ncp5623.txt b/Documentation/devicetree/bindings/leds/leds-ncp5623.txt
new file mode 100644
index 0000000..0dc8345
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-ncp5623.txt
@@ -0,0 +1,44 @@
+* ON Semiconductor - NCP5623 3-Channel LED Driver
+
+The NCP5623 is a 3-channel I2C LED driver. The brightness of each
+channel can be independently set using 32 levels. Each LED is represented
+as a sub-node of the device.
+
+Required properties:
+ - compatible: Should be "onnn,ncp5623"
+ - reg: I2C slave address (fixed to 0x38)
+ - #address-cells: must be 1
+ - #size-cells: must be 0
+ - onnn,led-iref-microamp: Current on the Iref pin in microampere
+ - led-max-microamp: Desired maximum current for each LED in microampere
+ (maximum 30000uA)
+
+LED sub-node properties:
+ - reg : LED channel number (0..2)
+ - For other LED properties see:
+ Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+led1: ncp5623@38 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "onnn,ncp5623";
+ reg = <0x38>;
+
+ led1_r@0 {
+ label = "ncp:power:red";
+ reg = <0>;
+ linux,default-trigger = "default-on";
+ };
+
+ led1_b@1 {
+ label = "ncp:power:blue";
+ reg = <1>;
+ };
+
+ led1_g@2 {
+ label = "ncp:power:green";
+ reg = <2>;
+ };
+};
--
2.5.0
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
