1* ImgTec Powerdown Controller (PDC) Interrupt Controller Binding
2
3This binding specifies what properties must be available in the device tree
4representation of a PDC IRQ controller. This has a number of input interrupt
5lines which can wake the system, and are passed on through output interrupt
6lines.
7
8Required properties:
9
10    - compatible: Specifies the compatibility list for the interrupt controller.
11      The type shall be <string> and the value shall include "img,pdc-intc".
12
13    - reg: Specifies the base PDC physical address(s) and size(s) of the
14      addressable register space. The type shall be <prop-encoded-array>.
15
16    - interrupt-controller: The presence of this property identifies the node
17      as an interrupt controller. No property value shall be defined.
18
19    - #interrupt-cells: Specifies the number of cells needed to encode an
20      interrupt source. The type shall be a <u32> and the value shall be 2.
21
22    - num-perips: Number of waking peripherals.
23
24    - num-syswakes: Number of SysWake inputs.
25
26    - interrupts: List of interrupt specifiers. The first specifier shall be the
27      shared SysWake interrupt, and remaining specifies shall be PDC peripheral
28      interrupts in order.
29
30* Interrupt Specifier Definition
31
32  Interrupt specifiers consists of 2 cells encoded as follows:
33
34    - <1st-cell>: The interrupt-number that identifies the interrupt source.
35                    0-7:  Peripheral interrupts
36                    8-15: SysWake interrupts
37
38    - <2nd-cell>: The level-sense information, encoded using the Linux interrupt
39                  flags as follows (only 4 valid for peripheral interrupts):
40                    0 = none (decided by software)
41                    1 = low-to-high edge triggered
42                    2 = high-to-low edge triggered
43                    3 = both edge triggered
44                    4 = active-high level-sensitive (required for perip irqs)
45                    8 = active-low level-sensitive
46
47* Examples
48
49Example 1:
50
51	/*
52	 * TZ1090 PDC block
53	 */
54	pdc: pdc@0x02006000 {
55		// This is an interrupt controller node.
56		interrupt-controller;
57
58		// Three cells to encode interrupt sources.
59		#interrupt-cells = <2>;
60
61		// Offset address of 0x02006000 and size of 0x1000.
62		reg = <0x02006000 0x1000>;
63
64		// Compatible with Meta hardware trigger block.
65		compatible = "img,pdc-intc";
66
67		// Three peripherals are connected.
68		num-perips = <3>;
69
70		// Four SysWakes are connected.
71		num-syswakes = <4>;
72
73		interrupts = <18 4 /* level */>, /* Syswakes */
74			     <30 4 /* level */>, /* Peripheral 0 (RTC) */
75			     <29 4 /* level */>, /* Peripheral 1 (IR) */
76			     <31 4 /* level */>; /* Peripheral 2 (WDT) */
77	};
78
79Example 2:
80
81	/*
82	 * An SoC peripheral that is wired through the PDC.
83	 */
84	rtc0 {
85		// The interrupt controller that this device is wired to.
86		interrupt-parent = <&pdc>;
87
88		// Interrupt source Peripheral 0
89		interrupts = <0   /* Peripheral 0 (RTC) */
90		              4>  /* IRQ_TYPE_LEVEL_HIGH */
91	};
92
93Example 3:
94
95	/*
96	 * An interrupt generating device that is wired to a SysWake pin.
97	 */
98	touchscreen0 {
99		// The interrupt controller that this device is wired to.
100		interrupt-parent = <&pdc>;
101
102		// Interrupt source SysWake 0 that is active-low level-sensitive
103		interrupts = <8 /* SysWake0 */
104			      8 /* IRQ_TYPE_LEVEL_LOW */>;
105	};
106