pinctrl: Broadcom NSP pinctrl device tree bindings

Broadcom NSP (Northstar plus) IOMUX Controller

The NSP IOMUX controller supports group based mux configuration. In

addition, certain pins can be muxed to GPIO function individually.

Required properties:

- compatible:

    Must be "brcm,nsp-pinmux"

- reg:

    Should contain the register physical address and length for each of

    GPIO_CONTROL0, GP_AUX_SEL and IPROC_CONFIG IOMUX registers

Properties in subnodes:

- function:

    The mux function to select

- groups:

    The list of groups to select with a given function

For more details, refer to

Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt

For example:

	pinmux: pinmux@1803f1c0 {

		compatible = "brcm,nsp-pinmux";

		reg = <0x1803f1c0 0x04>,

		      <0x18030028 0x04>,

		      <0x1803f408 0x04>;

		pinctrl-names = "default";

		pinctrl-0 = <&pwm &gpio_b &nand_sel>;

		pwm: pwm {

			function = "pwm";

			groups = "pwm0_grp", "pwm1_grp";

		};

		gpio_b: gpio_b {

			function = "gpio_b";

			groups = "gpio_b_0_grp", "gpio_b_1_grp";

		};

		nand_sel: nand_sel {

			function = "nand";

			groups = "nand_grp";

		};

	};

List of supported functions and groups in Northstar Plus:

"spi": "spi_grp"

"i2c": "i2c_grp"

"mdio": "mdio_grp"

"pwm": "pwm0_grp", "pwm1_grp", "pwm2_grp", "pwm3_grp"

"gpio_b": "gpio_b_0_grp", "gpio_b_1_grp", "gpio_b_2_grp", "gpio_b_3_grp"

"uart1": "uart1_grp"

"uart2": "uart2_grp"

"synce": "synce_grp"

"sata_led_grps": "sata0_led_grp", "sata1_led_grp"

"xtal_out": "xtal_out_grp"

"sdio": "sdio_pwr_grp", "sdio_1p8v_grp"

"switch_led": "switch_p05_led0_grp", "switch_p05_led1_grp"

"nand": "nand_grp"

"emmc": "emmc_grp"