linux-kernel - Re: [PATCH v3 4/9] dt-bindings: leds: Add bindings for lm3697 driver

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Date:   Fri, 12 Oct 2018 11:27:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     jacek.anaszewski@...il.com, pavel@....cz, lee.jones@...aro.org,
        tony@...mide.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 4/9] dt-bindings: leds: Add bindings for lm3697 driver

On Thu, Oct 11, 2018 at 11:51:18AM -0500, Dan Murphy wrote:
> Add the device tree bindings for the lm3697
> LED driver for backlighting and display.

Bindings are for h/w, not drivers...

> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>  .../devicetree/bindings/leds/leds-lm3697.txt  | 98 +++++++++++++++++++
>  1 file changed, 98 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-lm3697.txt b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
> new file mode 100644
> index 000000000000..4bb2ed51025b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
> @@ -0,0 +1,98 @@
> +* Texas Instruments - LM3697 Highly Efficient White LED Driver
> +
> +The LM3697 11-bit LED driver provides high-
> +performance backlight dimming for 1, 2, or 3 series
> +LED strings while delivering up to 90% efficiency.
> +
> +This device is suitable for display and keypad Lighting
> +
> +Required properties:
> +	- compatible:
> +		"ti,lm3697"
> +	- reg :  I2C slave address
> +	- #address-cells : 1
> +	- #size-cells : 0
> +
> +Optional properties:
> +	- enable-gpios : GPIO pin to enable/disable the device
> +	- vled-supply : LED supply
> +
> +Required child properties:
> +	- reg : 0 - LED is Controlled by bank A
> +		1 - LED is Controlled by bank B
> +	- led-sources : Indicates which HVLED string is associated to which
> +			control bank.  Each element in the array is associated
> +			with a specific HVLED string.  Element 0 is HVLED1,
> +			element 1 is HVLED2 and element 2 HVLED3.
> +			Additional information is contained
> +			in Documentation/devicetree/bindings/leds/common.txt
> +			0 - HVLED is not active in this control bank
> +			1 - HVLED string is controlled by this control bank
> +
> +Optional child properties:
> +	- runtime-ramp-up-msec: Current ramping from one brightness level to
> +				the a higher brightness level.
> +				Range from 2048 us - 117.44 s
> +	- runtime-ramp-down-msec: Current ramping from one brightness level to
> +				  the a lower brightness level.
> +				  Range from 2048 us - 117.44 s
> +	- label : see Documentation/devicetree/bindings/leds/common.txt
> +	- linux,default-trigger :
> +	   see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +HVLED string 1 and 3 are controlled by control bank A and HVLED 2 string is
> +controlled by control bank B.
> +
> +led-controller@36 {
> +	compatible = "ti,lm3697";
> +	reg = <0x36>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
> +	vled-supply = <&vbatt>;
> +
> +	led@0 {
> +		reg = <0>;
> +		led-sources = <1 0 1>;
> +		runtime-ramp-up-msec = <5000>;
> +		runtime-ramp-down-msec = <1000>;
> +		label = "white:first_backlight_cluster";
> +		linux,default-trigger = "backlight";
> +	};
> +
> +	led@1 {
> +		reg = <1>;
> +		led-sources = <0 1 0>;
> +		runtime-ramp-up-msec = <500>;
> +		runtime-ramp-down-msec = <1000>;
> +		label = "white:second_backlight_cluster";
> +		linux,default-trigger = "backlight";
> +	};
> +}
> +
> +All HVLED strings controlled by control bank A
> +
> +led-controller@36 {
> +	compatible = "ti,lm3697";
> +	reg = <0x36>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
> +	vled-supply = <&vbatt>;
> +
> +	led@0 {
> +		reg = <0>;
> +		led-sources = <1 1 1>;
> +		runtime-ramp-up-msec = <500>;
> +		runtime-ramp-down-msec = <1000>;
> +		label = "white:backlight_cluster";
> +		linux,default-trigger = "backlight";
> +	};
> +}
> +
> +For more product information please see the link below:
> +http://www.ti.com/lit/ds/symlink/lm3697.pdf
> -- 
> 2.19.0
>