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* Marvell SoC pinctrl core driver for mpp

The pinctrl driver enables Marvell SoCs to configure the multi-purpose pins
(mpp) to a specific function. For each SoC family there is a SoC specific
driver using this core driver.

Please refer to pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the meaning of the
phrase "pin configuration node".

A Marvell SoC pin configuration node is a node of a group of pins which can
be used for a specific device or function. Each node requires one or more
mpp pins or group of pins and a mpp function common to all pins.

Required properties for pinctrl driver:
- compatible: "marvell,<soc>-pinctrl"
  Please refer to each marvell,<soc>-pinctrl.txt binding doc for supported SoCs.

Required properties for pin configuration node:
- marvell,pins: string array of mpp pins or group of pins to be muxed.
- marvell,function: string representing a function to mux to for all
    marvell,pins given in this pin configuration node. The function has to be
    common for all marvell,pins. Please refer to marvell,<soc>-pinctrl.txt for
    valid pin/pin group names and available function names for each SoC.

Examples:

uart1: serial@12100 {
	compatible = "ns16550a";
	reg = <0x12100 0x100>;
	reg-shift = <2>;
	interrupts = <7>;

	pinctrl-0 = <&pmx_uart1_sw>;
	pinctrl-names = "default";
};

pinctrl: pinctrl@d0200 {
	compatible = "marvell,dove-pinctrl";
	reg = <0xd0200 0x20>;

	pmx_uart1_sw: pmx-uart1-sw {
		marvell,pins = "mpp_uart1";
		marvell,function = "uart1";
	};
};