1 NVIDIA Tegra PCIe controller
4 - compatible: "nvidia,tegra20-pcie" or "nvidia,tegra30-pcie"
5 - device_type: Must be "pci"
6 - reg: A list of physical base address and length for each set of controller
7 registers. Must contain an entry for each entry in the reg-names property.
8 - reg-names: Must include the following entries:
11 "cs": configuration space region
12 - interrupts: A list of interrupt outputs of the controller. Must contain an
13 entry for each entry in the interrupt-names property.
14 - interrupt-names: Must include the following entries:
15 "intr": The Tegra interrupt that is asserted for controller interrupts
16 "msi": The Tegra interrupt that is asserted when an MSI is received
17 - pex-clk-supply: Supply voltage for internal reference clock
18 - vdd-supply: Power supply for controller (1.05V)
19 - avdd-supply: Power supply for controller (1.05V) (not required for Tegra20)
20 - bus-range: Range of bus numbers associated with this controller
21 - #address-cells: Address representation for root ports (must be 3)
22 - cell 0 specifies the bus and device numbers of the root port:
24 [15:11]: device number
25 - cell 1 denotes the upper 32 address bits and should be 0
26 - cell 2 contains the lower 32 address bits and is used to translate to the
28 - #size-cells: Size representation for root ports (must be 2)
29 - ranges: Describes the translation of addresses for root ports and standard
30 PCI regions. The entries must be 6 cells each, where the first three cells
31 correspond to the address as described for the #address-cells property
32 above, the fourth cell is the physical CPU address to translate to and the
33 fifth and six cells are as described for the #size-cells property above.
34 - The first two entries are expected to translate the addresses for the root
35 port registers, which are referenced by the assigned-addresses property of
36 the root port nodes (see below).
37 - The remaining entries setup the mapping for the standard I/O, memory and
38 prefetchable PCI regions. The first cell determines the type of region
40 - 0x81000000: I/O memory region
41 - 0x82000000: non-prefetchable memory region
42 - 0xc2000000: prefetchable memory region
43 Please refer to the standard PCI bus binding document for a more detailed
45 - #interrupt-cells: Size representation for interrupts (must be 1)
46 - interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
47 Please refer to the standard PCI bus binding document for a more detailed
49 - clocks: Must contain an entry for each entry in clock-names.
50 See ../clocks/clock-bindings.txt for details.
51 - clock-names: Must include the following entries:
55 - cml (not required for Tegra20)
56 - resets: Must contain an entry for each entry in reset-names.
57 See ../reset/reset.txt for details.
58 - reset-names: Must include the following entries:
63 Root ports are defined as subnodes of the PCIe controller node.
66 - device_type: Must be "pci"
67 - assigned-addresses: Address and size of the port configuration registers
68 - reg: PCI bus address of the root port
69 - #address-cells: Must be 3
70 - #size-cells: Must be 2
71 - ranges: Sub-ranges distributed from the PCIe controller node. An empty
72 property is sufficient.
73 - nvidia,num-lanes: Number of lanes to use for this port. Valid combinations
75 - Root port 0 uses 4 lanes, root port 1 is unused.
76 - Both root ports use 2 lanes.
83 compatible = "nvidia,tegra20-pcie";
85 reg = <0x80003000 0x00000800 /* PADS registers */
86 0x80003800 0x00000200 /* AFI registers */
87 0x90000000 0x10000000>; /* configuration space */
88 reg-names = "pads", "afi", "cs";
89 interrupts = <0 98 0x04 /* controller interrupt */
90 0 99 0x04>; /* MSI interrupt */
91 interrupt-names = "intr", "msi";
93 #interrupt-cells = <1>;
94 interrupt-map-mask = <0 0 0 0>;
95 interrupt-map = <0 0 0 0 &intc GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
97 bus-range = <0x00 0xff>;
101 ranges = <0x82000000 0 0x80000000 0x80000000 0 0x00001000 /* port 0 registers */
102 0x82000000 0 0x80001000 0x80001000 0 0x00001000 /* port 1 registers */
103 0x81000000 0 0 0x82000000 0 0x00010000 /* downstream I/O */
104 0x82000000 0 0xa0000000 0xa0000000 0 0x10000000 /* non-prefetchable memory */
105 0xc2000000 0 0xb0000000 0xb0000000 0 0x10000000>; /* prefetchable memory */
107 clocks = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 118>;
108 clock-names = "pex", "afi", "pll_e";
109 resets = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 74>;
110 reset-names = "pex", "afi", "pcie_x";
115 assigned-addresses = <0x82000800 0 0x80000000 0 0x1000>;
116 reg = <0x000800 0 0 0 0>;
119 #address-cells = <3>;
124 nvidia,num-lanes = <2>;
129 assigned-addresses = <0x82001000 0 0x80001000 0 0x1000>;
130 reg = <0x001000 0 0 0 0>;
133 #address-cells = <3>;
138 nvidia,num-lanes = <2>;
148 vdd-supply = <&pci_vdd_reg>;
149 pex-clk-supply = <&pci_clk_reg>;
151 /* root port 00:01.0 */
155 /* bridge 01:00.0 (optional) */
157 reg = <0x010000 0 0 0 0>;
159 #address-cells = <3>;
164 /* endpoint 02:00.0 */
166 reg = <0x020000 0 0 0 0>;
172 Note that devices on the PCI bus are dynamically discovered using PCI's bus
173 enumeration and therefore don't need corresponding device nodes in DT. However
174 if a device on the PCI bus provides a non-probeable bus such as I2C or SPI,
175 device nodes need to be added in order to allow the bus' children to be
176 instantiated at the proper location in the operating system's device tree (as
177 illustrated by the optional nodes in the example above).