tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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- xlnx,all-inputs : if n-th bit is setup, GPIO-n is input
18- xlnx,dout-default : if n-th bit is 1, GPIO-n default value is 1
19- xlnx,gpio-width : gpio width
20- xlnx,tri-default : if n-th bit is 1, GPIO-n is in tristate mode
21- xlnx,is-dual : if 1, controller also uses the second channel
22- xlnx,all-inputs-2 : as above but for the second channel
23- xlnx,dout-default-2 : as above but the second channel
24- xlnx,gpio2-width : as above but for the second channel
25- xlnx,tri-default-2 : as above but for the second channel
26
27
28Example:
29gpio: gpio@40000000 {
30 #gpio-cells = <2>;
31 compatible = "xlnx,xps-gpio-1.00.a";
32 gpio-controller ;
33 interrupt-parent = <µblaze_0_intc>;
34 interrupts = < 6 2 >;
35 reg = < 0x40000000 0x10000 >;
36 xlnx,all-inputs = <0x0>;
37 xlnx,all-inputs-2 = <0x0>;
38 xlnx,dout-default = <0x0>;
39 xlnx,dout-default-2 = <0x0>;
40 xlnx,gpio-width = <0x2>;
41 xlnx,gpio2-width = <0x2>;
42 xlnx,interrupt-present = <0x1>;
43 xlnx,is-dual = <0x1>;
44 xlnx,tri-default = <0xffffffff>;
45 xlnx,tri-default-2 = <0xffffffff>;
46} ;