[PATCH 1/2] leds: ncp5623: Add device tree binding documentation
From: Florian Vaussard <hidden>
Date: 2016-06-21 07:29:49
Also in:
linux-leds, lkml
Subsystem:
led subsystem, open firmware and flattened device tree bindings, the rest · Maintainers:
Lee Jones, Pavel Machek, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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-EWQkb/GNqlFyDzI6CaY1VQ@public.gmane.org> --- .../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
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