Documentation/devicetree/bindings/pinctrl/brcm,nsp-pinmux.txt

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/pinctrl/brcm,nsp-pinmux.txt

File Facts

System
Linux kernel
Corpus path
Documentation/devicetree/bindings/pinctrl/brcm,nsp-pinmux.txt
Extension
.txt
Size
1628 bytes
Lines
80
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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"

Annotation

Implementation Notes