1Intel Interrupt Router Device Binding
2=====================================
3
4The device tree node which describes the operation of the Intel Interrupt Router
5device is as follows:
6
7Required properties :
8- reg : Specifies the interrupt router's PCI configuration space address as
9    defined by the Open Firmware spec.
10- compatible = "intel,irq-router"
11- intel,pirq-config : Specifies the IRQ routing register programming mechanism.
12    Valid values are:
13      "pci": IRQ routing is controlled by PCI configuration registers
14      "ibase": IRQ routing is in the memory-mapped IBASE register block
15- intel,ibase-offset : IBASE register offset in the interrupt router's PCI
16    configuration space, required only if intel,pirq-config = "ibase".
17- intel,actl-8bit : If ACTL (ACPI control) register width is 8-bit, this must
18    be specified. The 8-bit ACTL register is seen on ICH series chipset, like
19    ICH9/Panther Point/etc. On Atom chipset it is a 32-bit register.
20- intel,actl-addr : ACTL (ACPI control) register offset. ACTL can be either
21    in the interrupt router's PCI configuration space, or IBASE.
22- intel,pirq-link : Specifies the PIRQ link information with two cells. The
23    first cell is the register offset that controls the first PIRQ link routing.
24    The second cell is the total number of PIRQ links the router supports.
25- intel,pirq-mask : Specifies the IRQ mask representing the 16 IRQs in the
26    8259 PIC. Bit N is 1 means IRQ N is available to be routed.
27- intel,pirq-routing : Specifies all PCI devices' IRQ routing information,
28   encoded as 3 cells a group for a device. The first cell is the device's PCI
29   bus number, device number and function number encoding with PCI_BDF() macro.
30   The second cell is the PCI interrupt pin used by this device. The last cell
31   is which PIRQ line the PCI interrupt pin is routed to.
32
33
34Example
35-------
36
37#include <dt-bindings/interrupt-router/intel-irq.h>
38
39	irq-router@1f,0 {
40		reg = <0x0000f800 0 0 0 0>;
41		compatible = "intel,irq-router";
42		intel,pirq-config = "pci";
43		intel,pirq-link = <0x60 8>;
44		intel,pirq-mask = <0xdef8>;
45		intel,pirq-routing = <
46			PCI_BDF(0, 2, 0) INTA PIRQA
47			PCI_BDF(0, 3, 0) INTA PIRQB
48			PCI_BDF(0, 8, 0) INTA PIRQC
49			PCI_BDF(0, 8, 1) INTB PIRQD
50			PCI_BDF(1, 6, 0) INTA PIRQE
51			PCI_BDF(1, 6, 1) INTB PIRQF
52			PCI_BDF(1, 6, 2) INTC PIRQG
53			PCI_BDF(1, 6, 3) INTD PIRQH
54		>;
55	};
56