1 Intel IXP4xx XScale Networking Processors GPIO
3 This GPIO controller is found in the Intel IXP4xx processors.
4 It supports 16 GPIO lines.
6 The interrupt portions of the GPIO controller is hierarchical:
7 the synchronous edge detector is part of the GPIO block, but the
8 actual enabling/disabling of the interrupt line is done in the
9 main IXP4xx interrupt controller which has a 1:1 mapping for
10 the first 12 GPIO lines to 12 system interrupts.
12 The remaining 4 GPIO lines can not be used for receiving
15 The interrupt parent of this GPIO controller must be the
16 IXP4xx interrupt controller.
20 - compatible : Should be
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
31 gpio0: gpio@c8004000 {
32 compatible = "intel,ixp4xx-gpio";
33 reg = <0xc8004000 0x1000>;
37 #interrupt-cells = <2>;