xref: /linux/Documentation/devicetree/bindings/mux/reg-mux.yaml (revision 662fa3d6099374c4615bf64d06895e3573b935b2) 
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
7title: Generic register bitfield-based multiplexer controller bindings
8
9maintainers:
10  - Peter Rosin <peda@axentia.se>
11
12description: |+
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
16properties:
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    description: an array of register offset and pre-shifted bitfield mask
29      pairs, each describing a single mux control.
30
31  idle-states: true
32
33required:
34  - compatible
35  - mux-reg-masks
36  - '#mux-control-cells'
37
38additionalProperties: false
39
40examples:
41  - |
42    /* The parent device of mux controller is not a syscon device. */
43
44    #include <dt-bindings/mux/mux.h>
45
46    mux-controller {
47        compatible = "reg-mux";
48        #mux-control-cells = <1>;
49        mux-reg-masks =
50            <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */
51            <0x54 0x07>; /* 1: reg 0x54, bits 2:0 */
52    };
53
54    mdio-mux-1 {
55        compatible = "mdio-mux-multiplexer";
56        mux-controls = <&mux1 0>;
57        mdio-parent-bus = <&emdio1>;
58        #address-cells = <1>;
59        #size-cells = <0>;
60
61        mdio@0 {
62            reg = <0x0>;
63            #address-cells = <1>;
64            #size-cells = <0>;
65        };
66
67        mdio@8 {
68            reg = <0x8>;
69            #address-cells = <1>;
70            #size-cells = <0>;
71        };
72    };
73
74    mdio-mux-2 {
75        compatible = "mdio-mux-multiplexer";
76        mux-controls = <&mux1 1>;
77        mdio-parent-bus = <&emdio2>;
78        #address-cells = <1>;
79        #size-cells = <0>;
80
81        mdio@0 {
82            reg = <0x0>;
83            #address-cells = <1>;
84            #size-cells = <0>;
85        };
86
87        mdio@1 {
88            reg = <0x1>;
89            #address-cells = <1>;
90            #size-cells = <0>;
91        };
92    };
93
94  - |
95    /* The parent device of mux controller is syscon device. */
96
97    #include <dt-bindings/mux/mux.h>
98    syscon@1000 {
99        compatible = "fsl,imx7d-iomuxc-gpr", "fsl,imx6q-iomuxc-gpr", "syscon", "simple-mfd";
100        reg = <0x1000 0x100>;
101
102        mux2: mux-controller {
103            compatible = "mmio-mux";
104            #mux-control-cells = <1>;
105
106            mux-reg-masks =
107                <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */
108                <0x3 0x40>; /* 1: reg 0x3, bit 6 */
109            idle-states = <MUX_IDLE_AS_IS>, <0>;
110        };
111    };
112
113    video-mux {
114        compatible = "video-mux";
115        mux-controls = <&mux2 0>;
116        #address-cells = <1>;
117        #size-cells = <0>;
118
119        ports {
120            #address-cells = <1>;
121            #size-cells = <0>;
122
123            /* inputs 0..3 */
124            port@0 {
125                reg = <0>;
126            };
127            port@1 {
128                reg = <1>;
129            };
130            port@2 {
131                reg = <2>;
132            };
133            port@3 {
134                reg = <3>;
135            };
136
137            /* output */
138            port@4 {
139                reg = <4>;
140            };
141        };
142    };
143...
144