Kernel-4.18.0-80.el8_brcm,nsp-pinmux

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”