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

   1 # SPDX-License-Identifier: GPL-2.0
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/mux/reg-mux.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Generic register bitfield-based multiplexer controller bindings
   8
   9 maintainers:
  10   - Peter Rosin <peda@axentia.se>
  11
  12 description: |+
  13   Define register bitfields to be used to control multiplexers. The parent
  14   device tree node must be a device node to provide register r/w access.
  15
  16 properties:
  17   compatible:
  18     enum:
  19       - reg-mux   # parent device of mux controller is not syscon device
  20       - mmio-mux  # parent device of mux controller is syscon device
  21
  22   reg: true
  23
  24   '#mux-control-cells':
  25     const: 1
  26
  27   mux-reg-masks:
  28     $ref: /schemas/types.yaml#/definitions/uint32-matrix
  29     items:
  30       items:
  31         - description: register offset
  32         - description: pre-shifted bitfield mask
  33     description: Each entry pair describes a single mux control.
  34
  35   idle-states: true
  36
  37 required:
  38   - compatible
  39   - mux-reg-masks
  40   - '#mux-control-cells'
  41
  42 additionalProperties: false
  43
  44 examples:
  45   - |
  46     /* The parent device of mux controller is not a syscon device. */
  47
  48     #include <dt-bindings/mux/mux.h>
  49
  50     mux-controller {
  51         compatible = "reg-mux";
  52         #mux-control-cells = <1>;
  53         mux-reg-masks =
  54             <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */
  55             <0x54 0x07>; /* 1: reg 0x54, bits 2:0 */
  56     };
  57
  58     mdio-mux-1 {
  59         compatible = "mdio-mux-multiplexer";
  60         mux-controls = <&mux1 0>;
  61         mdio-parent-bus = <&emdio1>;
  62         #address-cells = <1>;
  63         #size-cells = <0>;
  64
  65         mdio@0 {
  66             reg = <0x0>;
  67             #address-cells = <1>;
  68             #size-cells = <0>;
  69         };
  70
  71         mdio@8 {
  72             reg = <0x8>;
  73             #address-cells = <1>;
  74             #size-cells = <0>;
  75         };
  76     };
  77
  78     mdio-mux-2 {
  79         compatible = "mdio-mux-multiplexer";
  80         mux-controls = <&mux1 1>;
  81         mdio-parent-bus = <&emdio2>;
  82         #address-cells = <1>;
  83         #size-cells = <0>;
  84
  85         mdio@0 {
  86             reg = <0x0>;
  87             #address-cells = <1>;
  88             #size-cells = <0>;
  89         };
  90
  91         mdio@1 {
  92             reg = <0x1>;
  93             #address-cells = <1>;
  94             #size-cells = <0>;
  95         };
  96     };
  97
  98   - |
  99     /* The parent device of mux controller is syscon device. */
 100
 101     #include <dt-bindings/mux/mux.h>
 102     syscon@1000 {
 103         reg = <0x1000 0x100>;
 104
 105         mux2: mux-controller {
 106             compatible = "mmio-mux";
 107             #mux-control-cells = <1>;
 108
 109             mux-reg-masks =
 110                 <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */
 111                 <0x3 0x40>; /* 1: reg 0x3, bit 6 */
 112             idle-states = <MUX_IDLE_AS_IS>, <0>;
 113         };
 114     };
 115
 116     video-mux {
 117         compatible = "video-mux";
 118         mux-controls = <&mux2 0>;
 119         #address-cells = <1>;
 120         #size-cells = <0>;
 121
 122         ports {
 123             #address-cells = <1>;
 124             #size-cells = <0>;
 125
 126             /* inputs 0..3 */
 127             port@0 {
 128                 reg = <0>;
 129             };
 130             port@1 {
 131                 reg = <1>;
 132             };
 133             port@2 {
 134                 reg = <2>;
 135             };
 136             port@3 {
 137                 reg = <3>;
 138             };
 139
 140             /* output */
 141             port@4 {
 142                 reg = <4>;
 143             };
 144         };
 145     };
 146 ...