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Commit 25a7a6f4 authored by Milo Kim's avatar Milo Kim Committed by Lee Jones
Browse files

Documentation: Add LP3943 DT bindings and document 



Bindings for LP3943 MFD, GPIO and PWM controller are added.

Signed-off-by: default avatarMilo Kim <milo.kim@ti.com>
Acked-by: default avatarThierry Reding <thierry.reding@gmail.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent aab5dc68

Documentation/devicetree/bindings/gpio/gpio-lp3943.txt

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TI/National Semiconductor LP3943 GPIO controller



Required properties:

  - compatible: "ti,lp3943-gpio"

  - gpio-controller: Marks the device node as a GPIO controller.

  - #gpio-cells: Should be 2. See gpio.txt in this directory for a

                 description of the cells format.



Example:

Simple LED controls with LP3943 GPIO controller



&i2c4 {

	lp3943@60 {

		compatible = "ti,lp3943";

		reg = <0x60>;



		gpioex: gpio {

			compatible = "ti,lp3943-gpio";

			gpio-controller;

			#gpio-cells = <2>;

		};

	};

};



leds {

	compatible = "gpio-leds";

	indicator1 {

		label = "indi1";

		gpios = <&gpioex 9 GPIO_ACTIVE_LOW>;

	};



	indicator2 {

		label = "indi2";

		gpios = <&gpioex 10 GPIO_ACTIVE_LOW>;

		default-state = "off";

	};

};

Documentation/devicetree/bindings/mfd/lp3943.txt

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TI/National Semiconductor LP3943 MFD driver



Required properties:

  - compatible: "ti,lp3943"

  - reg: I2C slave address. From 0x60 to 0x67.



LP3943 consists of two sub-devices, lp3943-gpio and lp3943-pwm.



For the LP3943 GPIO properties please refer to:

Documentation/devicetree/bindings/gpio/gpio-lp3943.txt



For the LP3943 PWM properties please refer to:

Documentation/devicetree/bindings/pwm/pwm-lp3943.txt



Example:



lp3943@60 {

	compatible = "ti,lp3943";

	reg = <0x60>;



	gpioex: gpio {

		compatible = "ti,lp3943-gpio";

		gpio-controller;

		#gpio-cells = <2>;

	};



	pwm3943: pwm {

		compatible = "ti,lp3943-pwm";

		#pwm-cells = <2>;

		ti,pwm0 = <8 9 10>;

		ti,pwm1 = <15>;

	};

};

Documentation/devicetree/bindings/pwm/pwm-lp3943.txt

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TI/National Semiconductor LP3943 PWM controller



Required properties:

  - compatible: "ti,lp3943-pwm"

  - #pwm-cells: Should be 2. See pwm.txt in this directory for a

                description of the cells format.

                Note that this hardware limits the period length to the

                range 6250~1600000.

  - ti,pwm0 or ti,pwm1: Output pin number(s) for PWM channel 0 or 1.

    0 = output 0

    1 = output 1

    .

    .

    15 = output 15



Example:

PWM 0 is for RGB LED brightness control

PWM 1 is for brightness control of LP8557 backlight device



&i2c3 {

	lp3943@60 {

		compatible = "ti,lp3943";

		reg = <0x60>;



		/*

		 * PWM 0 : output 8, 9 and 10

		 * PWM 1 : output 15

		 */

		pwm3943: pwm {

			compatible = "ti,lp3943-pwm";

			#pwm-cells = <2>;

			ti,pwm0 = <8 9 10>;

			ti,pwm1 = <15>;

		};

	};



};



/* LEDs control with PWM 0 of LP3943 */

pwmleds {

	compatible = "pwm-leds";

	rgb {

		label = "indi::rgb";

		pwms = <&pwm3943 0 10000>;

		max-brightness = <255>;

	};

};



&i2c4 {

	/* Backlight control with PWM 1 of LP3943 */

	backlight@2c {

		compatible = "ti,lp8557";

		reg = <0x2c>;



		pwms = <&pwm3943 1 10000>;

		pwm-names = "lp8557";

	};

};