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Documentation / devicetree / bindings / i2c / i2c-mux.txt




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Based on kernel version 3.16. Page generated on 2014-08-06 21:37 EST.

1	Common i2c bus multiplexer/switch properties.
2	
3	An i2c bus multiplexer/switch will have several child busses that are
4	numbered uniquely in a device dependent manner.  The nodes for an i2c bus
5	multiplexer/switch will have one child node for each child
6	bus.
7	
8	Required properties:
9	- #address-cells = <1>;
10	- #size-cells = <0>;
11	
12	Required properties for child nodes:
13	- #address-cells = <1>;
14	- #size-cells = <0>;
15	- reg : The sub-bus number.
16	
17	Optional properties for child nodes:
18	- Other properties specific to the multiplexer/switch hardware.
19	- Child nodes conforming to i2c bus binding
20	
21	
22	Example :
23	
24		/*
25		   An NXP pca9548 8 channel I2C multiplexer at address 0x70
26		   with two NXP pca8574 GPIO expanders attached, one each to
27		   ports 3 and 4.
28		 */
29	
30		mux@70 {
31			compatible = "nxp,pca9548";
32			reg = <0x70>;
33			#address-cells = <1>;
34			#size-cells = <0>;
35	
36			i2c@3 {
37				#address-cells = <1>;
38				#size-cells = <0>;
39				reg = <3>;
40	
41				gpio1: gpio@38 {
42					compatible = "nxp,pca8574";
43					reg = <0x38>;
44					#gpio-cells = <2>;
45					gpio-controller;
46				};
47			};
48			i2c@4 {
49				#address-cells = <1>;
50				#size-cells = <0>;
51				reg = <4>;
52	
53				gpio2: gpio@38 {
54					compatible = "nxp,pca8574";
55					reg = <0x38>;
56					#gpio-cells = <2>;
57					gpio-controller;
58				};
59			};
60		};
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