linux/Documentation/devicetree/bindings/gpio/gpio-grgpio.txt
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   1Aeroflex Gaisler GRGPIO General Purpose I/O cores.
   2
   3The GRGPIO GPIO core is available in the GRLIB VHDL IP core library.
   4
   5Note: In the ordinary environment for the GRGPIO core, a Leon SPARC system,
   6these properties are built from information in the AMBA plug&play.
   7
   8Required properties:
   9
  10- name : Should be "GAISLER_GPIO" or "01_01a"
  11
  12- reg : Address and length of the register set for the device
  13
  14- interrupts : Interrupt numbers for this device
  15
  16Optional properties:
  17
  18- nbits : The number of gpio lines. If not present driver assumes 32 lines.
  19
  20- irqmap : An array with an index for each gpio line. An index is either a valid
  21        index into the interrupts property array, or 0xffffffff that indicates
  22        no irq for that line. Driver provides no interrupt support if not
  23        present.
  24
  25For further information look in the documentation for the GLIB IP core library:
  26http://www.gaisler.com/products/grlib/grip.pdf
  27