On Tue, Jun 21, 2016 at 09:29:13AM +0200, Florian Vaussard wrote:
> 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 <[email protected]>
> ---
> .../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 {
Don't use underscores in node names.
> + 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
>
