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Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-xilinx.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-xilinx.txt | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt new file mode 100644 index 000000000..63bf4becd --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt @@ -0,0 +1,48 @@ +Xilinx plb/axi GPIO controller + +Dual channel GPIO controller with configurable number of pins +(from 1 to 32 per channel). Every pin can be configured as +input/output/tristate. Both channels share the same global IRQ but +local interrupts can be enabled on channel basis. + +Required properties: +- compatible : Should be "xlnx,xps-gpio-1.00.a" +- reg : Address and length of the register set for the device +- #gpio-cells : Should be two. The first cell is the pin number and the + second cell is used to specify optional parameters (currently unused). +- gpio-controller : Marks the device node as a GPIO controller. + +Optional properties: +- interrupts : Interrupt mapping for GPIO IRQ. +- interrupt-parent : Phandle for the interrupt controller that + services interrupts for this device. +- xlnx,all-inputs : if n-th bit is setup, GPIO-n is input +- xlnx,dout-default : if n-th bit is 1, GPIO-n default value is 1 +- xlnx,gpio-width : gpio width +- xlnx,tri-default : if n-th bit is 1, GPIO-n is in tristate mode +- xlnx,is-dual : if 1, controller also uses the second channel +- xlnx,all-inputs-2 : as above but for the second channel +- xlnx,dout-default-2 : as above but the second channel +- xlnx,gpio2-width : as above but for the second channel +- xlnx,tri-default-2 : as above but for the second channel + + +Example: +gpio: gpio@40000000 { + #gpio-cells = <2>; + compatible = "xlnx,xps-gpio-1.00.a"; + gpio-controller ; + interrupt-parent = <µblaze_0_intc>; + interrupts = < 6 2 >; + reg = < 0x40000000 0x10000 >; + xlnx,all-inputs = <0x0>; + xlnx,all-inputs-2 = <0x0>; + xlnx,dout-default = <0x0>; + xlnx,dout-default-2 = <0x0>; + xlnx,gpio-width = <0x2>; + xlnx,gpio2-width = <0x2>; + xlnx,interrupt-present = <0x1>; + xlnx,is-dual = <0x1>; + xlnx,tri-default = <0xffffffff>; + xlnx,tri-default-2 = <0xffffffff>; +} ; |