leds: add DT binding for BCM6358 LED controller

LEDs connected to Broadcom BCM6358 controller

This controller is present on BCM6358 and BCM6368.

In these SoCs there are Serial LEDs (LEDs connected to a 74x164 controller),

which can either be controlled by software (exporting the 74x164 as spi-gpio.

See Documentation/devicetree/bindings/gpio/gpio-74x164.txt), or

by hardware using this driver.

Required properties:

  - compatible : should be "brcm,bcm6358-leds".

  - #address-cells : must be 1.

  - #size-cells : must be 0.

  - reg : BCM6358 LED controller address and size.

Optional properties:

  - brcm,clk-div : SCK signal divider. Possible values are 1, 2, 4 and 8.

    Default : 1

  - brcm,clk-dat-low : Boolean, makes clock and data signals active low.

    Default : false

Each LED is represented as a sub-node of the brcm,bcm6358-leds device.

LED sub-node required properties:

  - reg : LED pin number (only LEDs 0 to 31 are valid).

LED sub-node optional properties:

  - label : see Documentation/devicetree/bindings/leds/common.txt

  - active-low : Boolean, makes LED active low.

    Default : false

  - default-state : see

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

  - linux,default-trigger : see

    Documentation/devicetree/bindings/leds/common.txt

Examples:

Scenario 1 : BCM6358

	leds0: led-controller@fffe00d0 {

		compatible = "brcm,bcm6358-leds";

		#address-cells = <1>;

		#size-cells = <0>;

		reg = <0xfffe00d0 0x8>;

		alarm_white {

			reg = <0>;

			active-low;

			label = "white:alarm";

		};

		tv_white {

			reg = <2>;

			active-low;

			label = "white:tv";

		};

		tel_white {

			reg = <3>;

			active-low;

			label = "white:tel";

		};

		adsl_white {

			reg = <4>;

			active-low;

			label = "white:adsl";

		};

	};

Scenario 2 : BCM6368

	leds0: led-controller@100000d0 {

		compatible = "brcm,bcm6358-leds";

		#address-cells = <1>;

		#size-cells = <0>;

		reg = <0x100000d0 0x8>;

		brcm,pol-low;

		brcm,clk-div = <4>;

		power_red {

			reg = <0>;

			active-low;

			label = "red:power";

		};

		power_green {

			reg = <1>;

			active-low;

			label = "green:power";

			default-state = "on";

		};

		power_blue {

			reg = <2>;

			label = "blue:power";

		};

		broadband_red {

			reg = <3>;

			active-low;

			label = "red:broadband";

		};

		broadband_green {

			reg = <4>;

			label = "green:broadband";

		};

		broadband_blue {

			reg = <5>;

			active-low;

			label = "blue:broadband";

		};

		wireless_red {

			reg = <6>;

			active-low;

			label = "red:wireless";

		};

		wireless_green {

			reg = <7>;

			active-low;

			label = "green:wireless";

		};

		wireless_blue {

			reg = <8>;

			label = "blue:wireless";

		};

		phone_red {

			reg = <9>;

			active-low;

			label = "red:phone";

		};

		phone_green {

			reg = <10>;

			active-low;

			label = "green:phone";

		};

		phone_blue {

			reg = <11>;

			label = "blue:phone";

		};

		upgrading_red {

			reg = <12>;

			active-low;

			label = "red:upgrading";

		};

		upgrading_green {

			reg = <13>;

			active-low;

			label = "green:upgrading";

		};

		upgrading_blue {

			reg = <14>;

			label = "blue:upgrading";

		};

	};