1Xilinx plb/axi GPIO controller
2
3Dual channel GPIO controller with configurable number of pins
4(from 1 to 32 per channel). Every pin can be configured as
5input/output/tristate. Both channels share the same global IRQ but
6local interrupts can be enabled on channel basis.
7
8Required 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
15Optional 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
30Example:
31gpio: 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} ;
49