Cirrus Logic Lochnagar Audio Development Board

Lochnagar is an evaluation and development board for Cirrus Logic
Smart CODEC and Amp devices. It allows the connection of most Cirrus
Logic devices on mini-cards, as well as allowing connection of
various application processor systems to provide a full evaluation
platform.  Audio system topology, clocking and power can all be
controlled through the Lochnagar, allowing the device under test
to be used in a variety of possible use cases.

This binding document describes the binding for the pinctrl portion
of the driver.

Also see these documents for generic binding information:
  [1] GPIO : ../gpio/gpio.txt
  [2] Pinctrl: ../pinctrl/pinctrl-bindings.txt

And these for relevant defines:
  [3] include/dt-bindings/pinctrl/lochnagar.h

This binding must be part of the Lochnagar MFD binding:
  [4] ../mfd/cirrus,lochnagar.txt

Required properties:

  - compatible : One of the following strings:
                 "cirrus,lochnagar-pinctrl"

  - gpio-controller : Indicates this device is a GPIO controller.
  - #gpio-cells : Must be 2. The first cell is the pin number, see
    [3] for available pins and the second cell is used to specify
    optional parameters, see [1].
  - gpio-ranges : Range of pins managed by the GPIO controller, see
    [1]. Both the GPIO and Pinctrl base should be set to zero and the
    count to the appropriate of the LOCHNAGARx_PIN_NUM_GPIOS define,
    see [3].

  - pinctrl-names : A pinctrl state named "default" must be defined.
  - pinctrl-0 : A phandle to the default pinctrl state.

Required sub-nodes:

The pin configurations are defined as a child of the pinctrl states
node, see [2]. Each sub-node can have the following properties:
  - groups : A list of groups to select (either this or "pins" must be
    specified), available groups:
      codec-aif1, codec-aif2, codec-aif3, dsp-aif1, dsp-aif2, psia1,
      psia2, gf-aif1, gf-aif2, gf-aif3, gf-aif4, spdif-aif, usb-aif1,
      usb-aif2, adat-aif, soundcard-aif
  - pins : A list of pin names to select (either this or "groups" must
    be specified), available pins:
      fpga-gpio1, fpga-gpio2, fpga-gpio3, fpga-gpio4, fpga-gpio5,
      fpga-gpio6, codec-gpio1, codec-gpio2, codec-gpio3, codec-gpio4,
      codec-gpio5, codec-gpio6, codec-gpio7, codec-gpio8, dsp-gpio1,
      dsp-gpio2, dsp-gpio3, dsp-gpio4, dsp-gpio5, dsp-gpio6, gf-gpio2,
      gf-gpio3, gf-gpio7, codec-aif1-bclk, codec-aif1-rxdat,
      codec-aif1-lrclk, codec-aif1-txdat, codec-aif2-bclk,
      codec-aif2-rxdat, codec-aif2-lrclk, codec-aif2-txdat,
      codec-aif3-bclk, codec-aif3-rxdat, codec-aif3-lrclk,
      codec-aif3-txdat, dsp-aif1-bclk, dsp-aif1-rxdat, dsp-aif1-lrclk,
      dsp-aif1-txdat, dsp-aif2-bclk, dsp-aif2-rxdat,
      dsp-aif2-lrclk, dsp-aif2-txdat, psia1-bclk, psia1-rxdat,
      psia1-lrclk, psia1-txdat, psia2-bclk, psia2-rxdat, psia2-lrclk,
      psia2-txdat, gf-aif3-bclk, gf-aif3-rxdat, gf-aif3-lrclk,
      gf-aif3-txdat, gf-aif4-bclk, gf-aif4-rxdat, gf-aif4-lrclk,
      gf-aif4-txdat, gf-aif1-bclk, gf-aif1-rxdat, gf-aif1-lrclk,
      gf-aif1-txdat, gf-aif2-bclk, gf-aif2-rxdat, gf-aif2-lrclk,
      gf-aif2-txdat, dsp-uart1-rx, dsp-uart1-tx, dsp-uart2-rx,
      dsp-uart2-tx, gf-uart2-rx, gf-uart2-tx, usb-uart-rx,
      codec-pdmclk1, codec-pdmdat1, codec-pdmclk2, codec-pdmdat2,
      codec-dmicclk1, codec-dmicdat1, codec-dmicclk2, codec-dmicdat2,
      codec-dmicclk3, codec-dmicdat3, codec-dmicclk4, codec-dmicdat4,
      dsp-dmicclk1, dsp-dmicdat1, dsp-dmicclk2, dsp-dmicdat2, i2c2-scl,
      i2c2-sda, i2c3-scl, i2c3-sda, i2c4-scl, i2c4-sda, dsp-standby,
      codec-mclk1, codec-mclk2, dsp-clkin, psia1-mclk, psia2-mclk,
      gf-gpio1, gf-gpio5, dsp-gpio20, led1, led2
  - function : The mux function to select, available functions:
      aif, fpga-gpio1, fpga-gpio2, fpga-gpio3, fpga-gpio4, fpga-gpio5,
      fpga-gpio6, codec-gpio1, codec-gpio2, codec-gpio3, codec-gpio4,
      codec-gpio5, codec-gpio6, codec-gpio7, codec-gpio8, dsp-gpio1,
      dsp-gpio2, dsp-gpio3, dsp-gpio4, dsp-gpio5, dsp-gpio6, gf-gpio2,
      gf-gpio3, gf-gpio7, gf-gpio1, gf-gpio5, dsp-gpio20, codec-clkout,
      dsp-clkout, pmic-32k, spdif-clkout, clk-12m288, clk-11m2986,
      clk-24m576, clk-22m5792, xmos-mclk, gf-clkout1, gf-mclk1,
      gf-mclk3, gf-mclk2, gf-clkout2, codec-mclk1, codec-mclk2,
      dsp-clkin, psia1-mclk, psia2-mclk, spdif-mclk, codec-irq,
      codec-reset, dsp-reset, dsp-irq, dsp-standby, codec-pdmclk1,
      codec-pdmdat1, codec-pdmclk2, codec-pdmdat2, codec-dmicclk1,
      codec-dmicdat1, codec-dmicclk2, codec-dmicdat2, codec-dmicclk3,
      codec-dmicdat3, codec-dmicclk4, codec-dmicdat4, dsp-dmicclk1,
      dsp-dmicdat1, dsp-dmicclk2, dsp-dmicdat2, dsp-uart1-rx,
      dsp-uart1-tx, dsp-uart2-rx, dsp-uart2-tx, gf-uart2-rx,
      gf-uart2-tx, usb-uart-rx, usb-uart-tx, i2c2-scl, i2c2-sda,
      i2c3-scl, i2c3-sda, i2c4-scl, i2c4-sda, spdif-aif, psia1,
      psia1-bclk, psia1-lrclk, psia1-rxdat, psia1-txdat, psia2,
      psia2-bclk, psia2-lrclk, psia2-rxdat, psia2-txdat, codec-aif1,
      codec-aif1-bclk, codec-aif1-lrclk, codec-aif1-rxdat,
      codec-aif1-txdat, codec-aif2, codec-aif2-bclk, codec-aif2-lrclk,
      codec-aif2-rxdat, codec-aif2-txdat, codec-aif3, codec-aif3-bclk,
      codec-aif3-lrclk, codec-aif3-rxdat, codec-aif3-txdat, dsp-aif1,
      dsp-aif1-bclk, dsp-aif1-lrclk, dsp-aif1-rxdat, dsp-aif1-txdat,
      dsp-aif2, dsp-aif2-bclk, dsp-aif2-lrclk, dsp-aif2-rxdat,
      dsp-aif2-txdat, gf-aif3, gf-aif3-bclk, gf-aif3-lrclk,
      gf-aif3-rxdat, gf-aif3-txdat, gf-aif4, gf-aif4-bclk,
      gf-aif4-lrclk, gf-aif4-rxdat, gf-aif4-txdat, gf-aif1,
      gf-aif1-bclk, gf-aif1-lrclk, gf-aif1-rxdat, gf-aif1-txdat,
      gf-aif2, gf-aif2-bclk, gf-aif2-lrclk, gf-aif2-rxdat,
      gf-aif2-txdat, usb-aif1, usb-aif2, adat-aif, soundcard-aif,

  - output-enable : Specifies that an AIF group will be used as a master
    interface (either this or input-enable is required if a group is
    being muxed to an AIF)
  - input-enable : Specifies that an AIF group will be used as a slave
    interface (either this or output-enable is required if a group is
    being muxed to an AIF)

Example:

lochnagar-pinctrl {
	compatible = "cirrus,lochnagar-pinctrl";

	gpio-controller;
	#gpio-cells = <2>;
	gpio-ranges = <&lochnagar 0 0 LOCHNAGAR2_PIN_NUM_GPIOS>;

	pinctrl-names = "default";
	pinctrl-0 = <&pin-settings>;

	pin-settings: pin-settings {
		ap-aif {
			input-enable;
			groups = "gf-aif1";
			function = "codec-aif3";
		};
		codec-aif {
			output-enable;
			groups = "codec-aif3";
			function = "gf-aif1";
		};
	};
};