Documentation/devicetree/bindings/mux/reg-mux.yaml

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/mux/reg-mux.yaml

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/mux/reg-mux.yaml
Extension
.yaml
Size
3341 bytes
Lines
147
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: configuration, schema, or hardware description
Status
atlas-only

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

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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/mux/reg-mux.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Generic register bitfield-based multiplexer controller

maintainers:
  - Peter Rosin <peda@axentia.se>

description: |+
  Define register bitfields to be used to control multiplexers. The parent
  device tree node must be a device node to provide register r/w access.

properties:
  compatible:
    enum:
      - reg-mux   # parent device of mux controller is not syscon device
      - mmio-mux  # parent device of mux controller is syscon device

  reg: true

  '#mux-control-cells':
    const: 1

  mux-reg-masks:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    items:
      items:
        - description: register offset
        - description: pre-shifted bitfield mask
    description: Each entry pair describes a single mux control.

  idle-states: true

required:
  - compatible
  - mux-reg-masks
  - '#mux-control-cells'

additionalProperties: false

examples:
  - |
    /* The parent device of mux controller is not a syscon device. */

    #include <dt-bindings/mux/mux.h>

    mux-controller {
        compatible = "reg-mux";
        #mux-control-cells = <1>;
        mux-reg-masks =
            <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */
            <0x54 0x07>; /* 1: reg 0x54, bits 2:0 */
    };

    mdio-mux-1 {
        compatible = "mdio-mux-multiplexer";
        mux-controls = <&mux1 0>;
        mdio-parent-bus = <&emdio1>;
        #address-cells = <1>;
        #size-cells = <0>;

        mdio@0 {
            reg = <0x0>;
            #address-cells = <1>;
            #size-cells = <0>;
        };

Annotation

Implementation Notes