1 # SPDX-License-Identifier: (GPL-2.0-only OR BS
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-dem
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Pinctrl-based I2C Bus Demultiplexer
8
9 maintainers:
10 - Wolfram Sang <wsa+renesas@sang-engineering.
11
12 description: |
13 This binding describes an I2C bus demultiple
14 route the I2C signals, and represents the pi
15 using the pinctrl device tree bindings. Thi
16 IP core at runtime which may have a better f
17 another I2C IP core on the SoC. The most si
18 GPIO bitbanging if your current runtime conf
19 internal IP core.
20
21 +-------------------------------+
22 | SoC |
23 | | +---
24 | +------------+ | | de
25 | |I2C IP Core1|--\ | +---
26 | +------------+ \-------+ | |
27 | |Pinctrl|--|------+
28 | +------------+ +-------+ |
29 | |I2C IP Core2|--/ |
30 | +------------+ |
31 | |
32 +-------------------------------+
33
34 allOf:
35 - $ref: /schemas/i2c/i2c-controller.yaml#
36
37 properties:
38 compatible:
39 const: i2c-demux-pinctrl
40
41 i2c-parent:
42 $ref: /schemas/types.yaml#/definitions/pha
43 items:
44 maxItems: 1
45 description:
46 List of phandles of I2C masters availabl
47 will be used as default.
48
49 i2c-bus-name:
50 $ref: /schemas/types.yaml#/definitions/str
51 description:
52 The name of this bus. Also needed as pi
53
54 required:
55 - compatible
56 - i2c-parent
57 - i2c-bus-name
58
59 unevaluatedProperties: false
60
61 examples:
62 - |
63 #include <dt-bindings/gpio/gpio.h>
64 #include <dt-bindings/interrupt-controller
65
66 gpioi2c2: i2c-9 {
67 #address-cells = <1>;
68 #size-cells = <0>;
69 compatible = "i2c-gpio";
70 scl-gpios = <&gpio5 5 (GPIO_ACTIVE_HIG
71 sda-gpios = <&gpio5 6 (GPIO_ACTIVE_HIG
72 i2c-gpio,delay-us = <5>;
73
74 // The I2C controller must have its st
75 // demultiplexer will enable it at run
76 status = "disabled";
77 };
78
79 iic2: i2c@e6520000 {
80 reg = <0xe6520000 0x425>;
81 pinctrl-0 = <&iic2_pins>;
82 // The pinctrl property for the parent
83 // state with the same name as i2c-bus
84 // node, not "default"!
85 pinctrl-names = "i2c-hdmi";
86
87 clock-frequency = <100000>;
88
89 // The I2C controller must have its st
90 // demultiplexer will enable it at run
91 status = "disabled";
92 };
93
94 i2c2: i2c@e6530000 {
95 reg = <0 0xe6530000 0 0x40>;
96 pinctrl-0 = <&i2c2_pins>;
97 // The pinctrl property for the parent
98 // state with the same name as i2c-bus
99 // node, not "default"!
100 pinctrl-names = "i2c-hdmi";
101
102 clock-frequency = <100000>;
103
104 // The I2C controller must have its st
105 // demultiplexer will enable it at run
106 status = "disabled";
107 };
108
109 // Example for a bus to be demuxed. It co
110 // HDMI, so the bus is named "i2c-hdmi":
111 i2chdmi: i2c-mux3 {
112 compatible = "i2c-demux-pinctrl";
113 i2c-parent = <&iic2>, <&i2c2>, <&gpioi
114 i2c-bus-name = "i2c-hdmi";
115 #address-cells = <1>;
116 #size-cells = <0>;
117
118 ak4643: codec@12 {
119 compatible = "asahi-kasei,ak4643";
120 #sound-dai-cells = <0>;
121 reg = <0x12>;
122 };
123
124 composite-in@20 {
125 compatible = "adi,adv7180";
126 reg = <0x20>;
127
128 port {
129 adv7180: endpoint {
130 bus-width = <8>;
131 remote-endpoint = <&vin1ep
132 };
133 };
134 };
135
136 hdmi@39 {
137 compatible = "adi,adv7511w";
138 reg = <0x39>;
139 interrupt-parent = <&gpio1>;
140 interrupts = <15 IRQ_TYPE_LEVEL_LO
141 clocks = <&cec_clock>;
142 clock-names = "cec";
143
144 avdd-supply = <&fixedregulator1v8>
145 dvdd-supply = <&fixedregulator1v8>
146 pvdd-supply = <&fixedregulator1v8>
147 dvdd-3v-supply = <&fixedregulator3
148 bgvdd-supply = <&fixedregulator1v8
149
150 adi,input-depth = <8>;
151 adi,input-colorspace = "rgb";
152 adi,input-clock = "1x";
153
154 ports {
155 #address-cells = <1>;
156 #size-cells = <0>;
157
158 port@0 {
159 reg = <0>;
160 adv7511_in: endpoint {
161 remote-endpoint = <&lv
162 };
163 };
164
165 port@1 {
166 reg = <1>;
167 adv7511_out: endpoint {
168 remote-endpoint = <&hd
169 };
170 };
171 };
172 };
173 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.