1Intel IXP4xx XScale Networking Processors GPIO 2 3This GPIO controller is found in the Intel IXP4xx processors. 4It supports 16 GPIO lines. 5 6The interrupt portions of the GPIO controller is hierarchical: 7the synchronous edge detector is part of the GPIO block, but the 8actual enabling/disabling of the interrupt line is done in the 9main IXP4xx interrupt controller which has a 1:1 mapping for 10the first 12 GPIO lines to 12 system interrupts. 11 12The remaining 4 GPIO lines can not be used for receiving 13interrupts. 14 15The interrupt parent of this GPIO controller must be the 16IXP4xx interrupt controller. 17 18Required properties: 19 20- compatible : Should be 21 "intel,ixp4xx-gpio" 22- reg : Should contain registers location and length 23- gpio-controller : marks this as a GPIO controller 24- #gpio-cells : Should be 2, see gpio/gpio.txt 25- interrupt-controller : marks this as an interrupt controller 26- #interrupt-cells : a standard two-cell interrupt, see 27 interrupt-controller/interrupts.txt 28 29Example: 30 31gpio0: gpio@c8004000 { 32 compatible = "intel,ixp4xx-gpio"; 33 reg = <0xc8004000 0x1000>; 34 gpio-controller; 35 #gpio-cells = <2>; 36 interrupt-controller; 37 #interrupt-cells = <2>; 38}; 39