1Xilinx Zynq GPIO controller Device Tree Bindings 2------------------------------------------- 3 4Required properties: 5- #gpio-cells : Should be two 6 - First cell is the GPIO line number 7 - Second cell is used to specify optional 8 parameters (unused) 9- compatible : Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0" 10- clocks : Clock specifier (see clock bindings for details) 11- gpio-controller : Marks the device node as a GPIO controller. 12- interrupts : Interrupt specifier (see interrupt bindings for 13 details) 14- interrupt-parent : Must be core interrupt controller 15- interrupt-controller : Marks the device node as an interrupt controller. 16- #interrupt-cells : Should be 2. The first cell is the GPIO number. 17 The second cell bits[3:0] is used to specify trigger type and level flags: 18 1 = low-to-high edge triggered. 19 2 = high-to-low edge triggered. 20 4 = active high level-sensitive. 21 8 = active low level-sensitive. 22- reg : Address and length of the register set for the device 23 24Example: 25 gpio@e000a000 { 26 #gpio-cells = <2>; 27 compatible = "xlnx,zynq-gpio-1.0"; 28 clocks = <&clkc 42>; 29 gpio-controller; 30 interrupt-parent = <&intc>; 31 interrupts = <0 20 4>; 32 interrupt-controller; 33 #interrupt-cells = <2>; 34 reg = <0xe000a000 0x1000>; 35 }; 36