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Documentation / devicetree / bindings / gpio / gpio-mxs.txt




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Based on kernel version 3.9. Page generated on 2013-05-02 22:58 EST.

1	* Freescale MXS GPIO controller
2	
3	The Freescale MXS GPIO controller is part of MXS PIN controller.  The
4	GPIOs are organized in port/bank.  Each port consists of 32 GPIOs.
5	
6	As the GPIO controller is embedded in the PIN controller and all the
7	GPIO ports share the same IO space with PIN controller, the GPIO node
8	will be represented as sub-nodes of MXS pinctrl node.
9	
10	Required properties for GPIO node:
11	- compatible : Should be "fsl,<soc>-gpio".  The supported SoCs include
12	  imx23 and imx28.
13	- interrupts : Should be the port interrupt shared by all 32 pins.
14	- gpio-controller : Marks the device node as a gpio controller.
15	- #gpio-cells : Should be two.  The first cell is the pin number and
16	  the second cell is used to specify the gpio polarity:
17	      0 = active high
18	      1 = active low
19	- interrupt-controller: Marks the device node as an interrupt controller.
20	- #interrupt-cells : Should be 2.  The first cell is the GPIO number.
21	  The second cell bits[3:0] is used to specify trigger type and level flags:
22	      1 = low-to-high edge triggered.
23	      2 = high-to-low edge triggered.
24	      4 = active high level-sensitive.
25	      8 = active low level-sensitive.
26	
27	Note: Each GPIO port should have an alias correctly numbered in "aliases"
28	node.
29	
30	Examples:
31	
32	aliases {
33		gpio0 = &gpio0;
34		gpio1 = &gpio1;
35		gpio2 = &gpio2;
36		gpio3 = &gpio3;
37		gpio4 = &gpio4;
38	};
39	
40	pinctrl@80018000 {
41		compatible = "fsl,imx28-pinctrl", "simple-bus";
42		reg = <0x80018000 2000>;
43	
44		gpio0: gpio@0 {
45			compatible = "fsl,imx28-gpio";
46			interrupts = <127>;
47			gpio-controller;
48			#gpio-cells = <2>;
49			interrupt-controller;
50			#interrupt-cells = <2>;
51		};
52	
53		gpio1: gpio@1 {
54			compatible = "fsl,imx28-gpio";
55			interrupts = <126>;
56			gpio-controller;
57			#gpio-cells = <2>;
58			interrupt-controller;
59			#interrupt-cells = <2>;
60		};
61	
62		gpio2: gpio@2 {
63			compatible = "fsl,imx28-gpio";
64			interrupts = <125>;
65			gpio-controller;
66			#gpio-cells = <2>;
67			interrupt-controller;
68			#interrupt-cells = <2>;
69		};
70	
71		gpio3: gpio@3 {
72			compatible = "fsl,imx28-gpio";
73			interrupts = <124>;
74			gpio-controller;
75			#gpio-cells = <2>;
76			interrupt-controller;
77			#interrupt-cells = <2>;
78		};
79	
80		gpio4: gpio@4 {
81			compatible = "fsl,imx28-gpio";
82			interrupts = <123>;
83			gpio-controller;
84			#gpio-cells = <2>;
85			interrupt-controller;
86			#interrupt-cells = <2>;
87		};
88	};
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