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Documentation / devicetree / bindings / gpio / gpio-mm-lantiq.txt




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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:00 EST.

1	Lantiq SoC External Bus memory mapped GPIO controller
2	
3	By attaching hardware latches to the EBU it is possible to create output
4	only gpios. This driver configures a special memory address, which when
5	written to outputs 16 bit to the latches.
6	
7	The node describing the memory mapped GPIOs needs to be a child of the node
8	describing the "lantiq,localbus".
9	
10	Required properties:
11	- compatible : Should be "lantiq,gpio-mm-lantiq"
12	- reg : Address and length of the register set for the device
13	- #gpio-cells : Should be two.  The first cell is the pin number and
14	  the second cell is used to specify optional parameters (currently
15	  unused).
16	- gpio-controller : Marks the device node as a gpio controller.
17	
18	Optional properties:
19	- lantiq,shadow : The default value that we shall assume as already set on the
20	  shift register cascade.
21	
22	Example:
23	
24	localbus@0 {
25		#address-cells = <2>;
26		#size-cells = <1>;
27		ranges = <0 0 0x0 0x3ffffff /* addrsel0 */
28			1 0 0x4000000 0x4000010>; /* addsel1 */
29		compatible = "lantiq,localbus", "simple-bus";
30	
31		gpio_mm0: gpio@4000000 {
32			compatible = "lantiq,gpio-mm";
33			reg = <1 0x0 0x10>;
34			gpio-controller;
35			#gpio-cells = <2>;
36			lantiq,shadow = <0x77f>
37		};
38	}
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