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




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

1	Xilinx plb/axi GPIO controller
2	
3	Dual channel GPIO controller with configurable number of pins
4	(from 1 to 32 per channel). Every pin can be configured as
5	input/output/tristate. Both channels share the same global IRQ but
6	local interrupts can be enabled on channel basis.
7	
8	Required properties:
9	- compatible : Should be "xlnx,xps-gpio-1.00.a"
10	- reg : Address and length of the register set for the device
11	- #gpio-cells : Should be two. The first cell is the pin number and the
12	  second cell is used to specify optional parameters (currently unused).
13	- gpio-controller : Marks the device node as a GPIO controller.
14	
15	Optional properties:
16	- interrupts : Interrupt mapping for GPIO IRQ.
17	- interrupt-parent : Phandle for the interrupt controller that
18	  services interrupts for this device.
19	- xlnx,all-inputs : if n-th bit is setup, GPIO-n is input
20	- xlnx,dout-default : if n-th bit is 1, GPIO-n default value is 1
21	- xlnx,gpio-width : gpio width
22	- xlnx,tri-default : if n-th bit is 1, GPIO-n is in tristate mode
23	- xlnx,is-dual : if 1, controller also uses the second channel
24	- xlnx,all-inputs-2 : as above but for the second channel
25	- xlnx,dout-default-2 : as above but the second channel
26	- xlnx,gpio2-width : as above but for the second channel
27	- xlnx,tri-default-2 : as above but for the second channel
28	
29	
30	Example:
31	gpio: gpio@40000000 {
32		#gpio-cells = <2>;
33		compatible = "xlnx,xps-gpio-1.00.a";
34		gpio-controller ;
35		interrupt-parent = <&microblaze_0_intc>;
36		interrupts = < 6 2 >;
37		reg = < 0x40000000 0x10000 >;
38		xlnx,all-inputs = <0x0>;
39		xlnx,all-inputs-2 = <0x0>;
40		xlnx,dout-default = <0x0>;
41		xlnx,dout-default-2 = <0x0>;
42		xlnx,gpio-width = <0x2>;
43		xlnx,gpio2-width = <0x2>;
44		xlnx,interrupt-present = <0x1>;
45		xlnx,is-dual = <0x1>;
46		xlnx,tri-default = <0xffffffff>;
47		xlnx,tri-default-2 = <0xffffffff>;
48	} ;
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