pinctrl: Cygnus: define Broadcom Cygnus GPIO/PINCONF binding

Broadcom Cygnus GPIO/PINCONF Controller

Required properties:

- compatible:

    Must be "brcm,cygnus-ccm-gpio", "brcm,cygnus-asiu-gpio", or

    "brcm,cygnus-crmu-gpio"

- reg:

    Define the base and range of the I/O address space that contains the Cygnus

GPIO/PINCONF controller registers

- #gpio-cells:

    Must be two. The first cell is the GPIO pin number (within the

controller's pin space) and the second cell is used for the following:

    bit[0]: polarity (0 for active high and 1 for active low)

- gpio-controller:

    Specifies that the node is a GPIO controller

Optional properties:

- interrupts:

    Interrupt ID

- interrupt-controller:

    Specifies that the node is an interrupt controller

- pinmux:

    Specifies the phandle to the IOMUX device, where pins can be individually

muxed to GPIO

Supported generic PINCONF properties in child nodes:

- pins:

    The list of pins (within the controller's own pin space) that properties

in the node apply to. Pin names are "gpio-<pin>"

- bias-disable:

    Disable pin bias

- bias-pull-up:

    Enable internal pull up resistor

- bias-pull-down:

    Enable internal pull down resistor

- drive-strength:

    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)

Example:

	gpio_ccm: gpio@1800a000 {

		compatible = "brcm,cygnus-ccm-gpio";

		reg = <0x1800a000 0x50>,

		      <0x0301d164 0x20>;

		#gpio-cells = <2>;

		gpio-controller;

		interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;

		interrupt-controller;

		touch_pins: touch_pins {

			pwr: pwr {

				pins = "gpio-0";

				drive-strength = <16>;

			};

			event: event {

				pins = "gpio-1";

				bias-pull-up;

			};

		};

	};

	gpio_asiu: gpio@180a5000 {

		compatible = "brcm,cygnus-asiu-gpio";

		reg = <0x180a5000 0x668>;

		#gpio-cells = <2>;

		gpio-controller;

		interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;

		interrupt-controller;

	};

	/*

	 * Touchscreen that uses the CCM GPIO 0 and 1

	 */

	tsc {

		...

		...

		gpio-pwr = <&gpio_ccm 0 0>;

		gpio-event = <&gpio_ccm 1 0>;

	};

	/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */

	bluetooth {

		...

		...

		bcm,rfkill-bank-sel = <&gpio_asiu 5 1>

	}