1* Freescale i.MX/MXC GPIO controller 2 3Required properties: 4- compatible : Should be "fsl,<soc>-gpio" 5- reg : Address and length of the register set for the device 6- interrupts : Should be the port interrupt shared by all 32 pins, if 7 one number. If two numbers, the first one is the interrupt shared 8 by low 16 pins and the second one is for high 16 pins. 9- gpio-controller : Marks the device node as a gpio controller. 10- #gpio-cells : Should be two. The first cell is the pin number and 11 the second cell is used to specify the gpio polarity: 12 0 = active high 13 1 = active low 14- interrupt-controller: Marks the device node as an interrupt controller. 15- #interrupt-cells : Should be 2. The first cell is the GPIO number. 16 The second cell bits[3:0] is used to specify trigger type and level flags: 17 1 = low-to-high edge triggered. 18 2 = high-to-low edge triggered. 19 4 = active high level-sensitive. 20 8 = active low level-sensitive. 21 22Example: 23 24gpio0: gpio@73f84000 { 25 compatible = "fsl,imx51-gpio", "fsl,imx35-gpio"; 26 reg = <0x73f84000 0x4000>; 27 interrupts = <50 51>; 28 gpio-controller; 29 #gpio-cells = <2>; 30 interrupt-controller; 31 #interrupt-cells = <2>; 32}; 33