Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt - maze/linux - Git at Google

 NVIDIA Tegra PCIe controller

 Required properties:
 - compatible: "nvidia,tegra20-pcie" or "nvidia,tegra30-pcie"
 - device_type: Must be "pci"
 - reg: A list of physical base address and length for each set of controller
   registers. Must contain an entry for each entry in the reg-names property.
 - reg-names: Must include the following entries:
   "pads": PADS registers
   "afi": AFI registers
   "cs": configuration space region
 - interrupts: A list of interrupt outputs of the controller. Must contain an
   entry for each entry in the interrupt-names property.
 - interrupt-names: Must include the following entries:
   "intr": The Tegra interrupt that is asserted for controller interrupts
   "msi": The Tegra interrupt that is asserted when an MSI is received
 - pex-clk-supply: Supply voltage for internal reference clock
 - vdd-supply: Power supply for controller (1.05V)
 - avdd-supply: Power supply for controller (1.05V) (not required for Tegra20)
 - bus-range: Range of bus numbers associated with this controller
 - #address-cells: Address representation for root ports (must be 3)
   - cell 0 specifies the bus and device numbers of the root port:
     [23:16]: bus number
     [15:11]: device number
   - cell 1 denotes the upper 32 address bits and should be 0
   - cell 2 contains the lower 32 address bits and is used to translate to the
     CPU address space
 - #size-cells: Size representation for root ports (must be 2)
 - ranges: Describes the translation of addresses for root ports and standard
   PCI regions. The entries must be 6 cells each, where the first three cells
   correspond to the address as described for the #address-cells property
   above, the fourth cell is the physical CPU address to translate to and the
   fifth and six cells are as described for the #size-cells property above.
   - The first two entries are expected to translate the addresses for the root
     port registers, which are referenced by the assigned-addresses property of
     the root port nodes (see below).
   - The remaining entries setup the mapping for the standard I/O, memory and
     prefetchable PCI regions. The first cell determines the type of region
     that is setup:
     - 0x81000000: I/O memory region
     - 0x82000000: non-prefetchable memory region
     - 0xc2000000: prefetchable memory region
   Please refer to the standard PCI bus binding document for a more detailed
   explanation.
 - #interrupt-cells: Size representation for interrupts (must be 1)
 - interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
   Please refer to the standard PCI bus binding document for a more detailed
   explanation.
 - clocks: Must contain an entry for each entry in clock-names.
   See ../clocks/clock-bindings.txt for details.
 - clock-names: Must include the following entries:
   - pex
   - afi
   - pll_e
   - cml (not required for Tegra20)
 - resets: Must contain an entry for each entry in reset-names.
   See ../reset/reset.txt for details.
 - reset-names: Must include the following entries:
   - pex
   - afi
   - pcie_x

 Root ports are defined as subnodes of the PCIe controller node.

 Required properties:
 - device_type: Must be "pci"
 - assigned-addresses: Address and size of the port configuration registers
 - reg: PCI bus address of the root port
 - #address-cells: Must be 3
 - #size-cells: Must be 2
 - ranges: Sub-ranges distributed from the PCIe controller node. An empty
   property is sufficient.
 - nvidia,num-lanes: Number of lanes to use for this port. Valid combinations
   are:
   - Root port 0 uses 4 lanes, root port 1 is unused.
   - Both root ports use 2 lanes.

 Example:

 SoC DTSI:

 	pcie-controller {
 		compatible = "nvidia,tegra20-pcie";
 		device_type = "pci";
 		reg = <0x80003000 0x00000800   /* PADS registers */
 		       0x80003800 0x00000200   /* AFI registers */
 		       0x90000000 0x10000000>; /* configuration space */
 		reg-names = "pads", "afi", "cs";
 		interrupts = <0 98 0x04   /* controller interrupt */
 		              0 99 0x04>; /* MSI interrupt */
 		interrupt-names = "intr", "msi";

 		#interrupt-cells = <1>;
 		interrupt-map-mask = <0 0 0 0>;
 		interrupt-map = <0 0 0 0 &intc GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;

 		bus-range = <0x00 0xff>;
 		#address-cells = <3>;
 		#size-cells = <2>;

 		ranges = <0x82000000 0 0x80000000 0x80000000 0 0x00001000   /* port 0 registers */
 			  0x82000000 0 0x80001000 0x80001000 0 0x00001000   /* port 1 registers */
 			  0x81000000 0 0          0x82000000 0 0x00010000   /* downstream I/O */
 			  0x82000000 0 0xa0000000 0xa0000000 0 0x10000000   /* non-prefetchable memory */
 			  0xc2000000 0 0xb0000000 0xb0000000 0 0x10000000>; /* prefetchable memory */

 		clocks = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 118>;
 		clock-names = "pex", "afi", "pll_e";
 		resets = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 74>;
 		reset-names = "pex", "afi", "pcie_x";
 		status = "disabled";

 		pci@1,0 {
 			device_type = "pci";
 			assigned-addresses = <0x82000800 0 0x80000000 0 0x1000>;
 			reg = <0x000800 0 0 0 0>;
 			status = "disabled";

 			#address-cells = <3>;
 			#size-cells = <2>;

 			ranges;

 			nvidia,num-lanes = <2>;
 		};

 		pci@2,0 {
 			device_type = "pci";
 			assigned-addresses = <0x82001000 0 0x80001000 0 0x1000>;
 			reg = <0x001000 0 0 0 0>;
 			status = "disabled";

 			#address-cells = <3>;
 			#size-cells = <2>;

 			ranges;

 			nvidia,num-lanes = <2>;
 		};
 	};


 Board DTS:

 	pcie-controller {
 		status = "okay";

 		vdd-supply = <&pci_vdd_reg>;
 		pex-clk-supply = <&pci_clk_reg>;

 		/* root port 00:01.0 */
 		pci@1,0 {
 			status = "okay";

 			/* bridge 01:00.0 (optional) */
 			pci@0,0 {
 				reg = <0x010000 0 0 0 0>;

 				#address-cells = <3>;
 				#size-cells = <2>;

 				device_type = "pci";

 				/* endpoint 02:00.0 */
 				pci@0,0 {
 					reg = <0x020000 0 0 0 0>;
 				};
 			};
 		};
 	};

 Note that devices on the PCI bus are dynamically discovered using PCI's bus
 enumeration and therefore don't need corresponding device nodes in DT. However
 if a device on the PCI bus provides a non-probeable bus such as I2C or SPI,
 device nodes need to be added in order to allow the bus' children to be
 instantiated at the proper location in the operating system's device tree (as
 illustrated by the optional nodes in the example above).
	NVIDIA Tegra PCIe controller

	Required properties:
	- compatible: "nvidia,tegra20-pcie" or "nvidia,tegra30-pcie"
	- device_type: Must be "pci"
	- reg: A list of physical base address and length for each set of controller
	registers. Must contain an entry for each entry in the reg-names property.
	- reg-names: Must include the following entries:
	"pads": PADS registers
	"afi": AFI registers
	"cs": configuration space region
	- interrupts: A list of interrupt outputs of the controller. Must contain an
	entry for each entry in the interrupt-names property.
	- interrupt-names: Must include the following entries:
	"intr": The Tegra interrupt that is asserted for controller interrupts
	"msi": The Tegra interrupt that is asserted when an MSI is received
	- pex-clk-supply: Supply voltage for internal reference clock
	- vdd-supply: Power supply for controller (1.05V)
	- avdd-supply: Power supply for controller (1.05V) (not required for Tegra20)
	- bus-range: Range of bus numbers associated with this controller
	- #address-cells: Address representation for root ports (must be 3)
	- cell 0 specifies the bus and device numbers of the root port:
	[23:16]: bus number
	[15:11]: device number
	- cell 1 denotes the upper 32 address bits and should be 0
	- cell 2 contains the lower 32 address bits and is used to translate to the
	CPU address space
	- #size-cells: Size representation for root ports (must be 2)
	- ranges: Describes the translation of addresses for root ports and standard
	PCI regions. The entries must be 6 cells each, where the first three cells
	correspond to the address as described for the #address-cells property
	above, the fourth cell is the physical CPU address to translate to and the
	fifth and six cells are as described for the #size-cells property above.
	- The first two entries are expected to translate the addresses for the root
	port registers, which are referenced by the assigned-addresses property of
	the root port nodes (see below).
	- The remaining entries setup the mapping for the standard I/O, memory and
	prefetchable PCI regions. The first cell determines the type of region
	that is setup:
	- 0x81000000: I/O memory region
	- 0x82000000: non-prefetchable memory region
	- 0xc2000000: prefetchable memory region
	Please refer to the standard PCI bus binding document for a more detailed
	explanation.
	- #interrupt-cells: Size representation for interrupts (must be 1)
	- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties
	Please refer to the standard PCI bus binding document for a more detailed
	explanation.
	- clocks: Must contain an entry for each entry in clock-names.
	See ../clocks/clock-bindings.txt for details.
	- clock-names: Must include the following entries:
	- pex
	- afi
	- pll_e
	- cml (not required for Tegra20)
	- resets: Must contain an entry for each entry in reset-names.
	See ../reset/reset.txt for details.
	- reset-names: Must include the following entries:
	- pex
	- afi
	- pcie_x

	Root ports are defined as subnodes of the PCIe controller node.

	Required properties:
	- device_type: Must be "pci"
	- assigned-addresses: Address and size of the port configuration registers
	- reg: PCI bus address of the root port
	- #address-cells: Must be 3
	- #size-cells: Must be 2
	- ranges: Sub-ranges distributed from the PCIe controller node. An empty
	property is sufficient.
	- nvidia,num-lanes: Number of lanes to use for this port. Valid combinations
	are:
	- Root port 0 uses 4 lanes, root port 1 is unused.
	- Both root ports use 2 lanes.

	Example:

	SoC DTSI:

	pcie-controller {
	compatible = "nvidia,tegra20-pcie";
	device_type = "pci";
	reg = <0x80003000 0x00000800 /* PADS registers */
	0x80003800 0x00000200 /* AFI registers */
	0x90000000 0x10000000>; /* configuration space */
	reg-names = "pads", "afi", "cs";
	interrupts = <0 98 0x04 /* controller interrupt */
	0 99 0x04>; /* MSI interrupt */
	interrupt-names = "intr", "msi";

	#interrupt-cells = <1>;
	interrupt-map-mask = <0 0 0 0>;
	interrupt-map = <0 0 0 0 &intc GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;

	bus-range = <0x00 0xff>;
	#address-cells = <3>;
	#size-cells = <2>;

	ranges = <0x82000000 0 0x80000000 0x80000000 0 0x00001000 /* port 0 registers */
	0x82000000 0 0x80001000 0x80001000 0 0x00001000 /* port 1 registers */
	0x81000000 0 0 0x82000000 0 0x00010000 /* downstream I/O */
	0x82000000 0 0xa0000000 0xa0000000 0 0x10000000 /* non-prefetchable memory */
	0xc2000000 0 0xb0000000 0xb0000000 0 0x10000000>; /* prefetchable memory */

	clocks = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 118>;
	clock-names = "pex", "afi", "pll_e";
	resets = <&tegra_car 70>, <&tegra_car 72>, <&tegra_car 74>;
	reset-names = "pex", "afi", "pcie_x";
	status = "disabled";

	pci@1,0 {
	device_type = "pci";
	assigned-addresses = <0x82000800 0 0x80000000 0 0x1000>;
	reg = <0x000800 0 0 0 0>;
	status = "disabled";

	#address-cells = <3>;
	#size-cells = <2>;

	ranges;

	nvidia,num-lanes = <2>;
	};

	pci@2,0 {
	device_type = "pci";
	assigned-addresses = <0x82001000 0 0x80001000 0 0x1000>;
	reg = <0x001000 0 0 0 0>;
	status = "disabled";

	#address-cells = <3>;
	#size-cells = <2>;

	ranges;

	nvidia,num-lanes = <2>;
	};
	};


	Board DTS:

	pcie-controller {
	status = "okay";

	vdd-supply = <&pci_vdd_reg>;
	pex-clk-supply = <&pci_clk_reg>;

	/* root port 00:01.0 */
	pci@1,0 {
	status = "okay";

	/* bridge 01:00.0 (optional) */
	pci@0,0 {
	reg = <0x010000 0 0 0 0>;

	#address-cells = <3>;
	#size-cells = <2>;

	device_type = "pci";

	/* endpoint 02:00.0 */
	pci@0,0 {
	reg = <0x020000 0 0 0 0>;
	};
	};
	};
	};

	Note that devices on the PCI bus are dynamically discovered using PCI's bus
	enumeration and therefore don't need corresponding device nodes in DT. However
	if a device on the PCI bus provides a non-probeable bus such as I2C or SPI,
	device nodes need to be added in order to allow the bus' children to be
	instantiated at the proper location in the operating system's device tree (as
	illustrated by the optional nodes in the example above).