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

   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 } ;