tjh.dev
Linux kernel mirror (for testing)
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linux
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};