1GPIO controllers on MPC8xxx SoCs
2
3This is for the non-QE/CPM/GUTs GPIO controllers as found on
48349, 8572, 8610 and compatible.
5
6Every GPIO controller node must have #gpio-cells property defined,
7this information will be used to translate gpio-specifiers.
8See bindings/gpio/gpio.txt for details of how to specify GPIO
9information for devices.
10
11The GPIO module usually is connected to the SoC's internal interrupt
12controller, see bindings/interrupt-controller/interrupts.txt (the
13interrupt client nodes section) for details how to specify this GPIO
14module's interrupt.
15
16The GPIO module may serve as another interrupt controller (cascaded to
17the SoC's internal interrupt controller).  See the interrupt controller
18nodes section in bindings/interrupt-controller/interrupts.txt for
19details.
20
21Required properties:
22- compatible:		"fsl,<chip>-gpio" followed by "fsl,mpc8349-gpio"
23			for 83xx, "fsl,mpc8572-gpio" for 85xx, or
24			"fsl,mpc8610-gpio" for 86xx.
25- #gpio-cells:		Should be two. The first cell is the pin number
26			and the second cell is used to specify optional
27			parameters (currently unused).
28- interrupt-parent:	Phandle for the interrupt controller that
29			services interrupts for this device.
30- interrupts:		Interrupt mapping for GPIO IRQ.
31- gpio-controller:	Marks the port as GPIO controller.
32
33Optional properties:
34- interrupt-controller:	Empty boolean property which marks the GPIO
35			module as an IRQ controller.
36- #interrupt-cells:	Should be two.  Defines the number of integer
37			cells required to specify an interrupt within
38			this interrupt controller.  The first cell
39			defines the pin number, the second cell
40			defines additional flags (trigger type,
41			trigger polarity).  Note that the available
42			set of trigger conditions supported by the
43			GPIO module depends on the actual SoC.
44
45Example of gpio-controller nodes for a MPC8347 SoC:
46
47	gpio1: gpio-controller@c00 {
48		#gpio-cells = <2>;
49		compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
50		reg = <0xc00 0x100>;
51		interrupt-parent = <&ipic>;
52		interrupts = <74 0x8>;
53		gpio-controller;
54		interrupt-controller;
55		#interrupt-cells = <2>;
56	};
57
58	gpio2: gpio-controller@d00 {
59		#gpio-cells = <2>;
60		compatible = "fsl,mpc8347-gpio", "fsl,mpc8349-gpio";
61		reg = <0xd00 0x100>;
62		interrupt-parent = <&ipic>;
63		interrupts = <75 0x8>;
64		gpio-controller;
65	};
66
67Example of a peripheral using the GPIO module as an IRQ controller:
68
69	funkyfpga@0 {
70		compatible = "funky-fpga";
71		...
72		interrupt-parent = <&gpio1>;
73		interrupts = <4 3>;
74	};
75