Add documentation for PCIe host driver available in MT7623
series SoCs.
Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
---
.../bindings/pci/mediatek,mt7623-pcie.txt | 153 +++++++++++++++++++++
1 file changed, 153 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/mediatek,mt7623-pcie.txt
diff --git a/Documentation/devicetree/bindings/pci/mediatek,mt7623-pcie.txt b/Documentation/devicetree/bindings/pci/mediatek,mt7623-pcie.txt
new file mode 100644
index 0000000..ee93ba2
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/mediatek,mt7623-pcie.txt
@@ -0,0 +1,153 @@
+Mediatek MT7623 PCIe controller
+
+Required properties:
+- compatible: Should contain "mediatek,mt7623-pcie".
+- device_type: Must be "pci"
+- reg: Base addresses and lengths of the pcie controller.
+- interrupts: A list of interrupt outputs of the 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)
+- 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:
+ - free_ck
+- power-domains: A phandle and power domain specifier pair to the power domain
+ which is responsible for collapsing and restoring power to the peripheral
+- bus-range: Range of bus numbers associated with this controller
+- 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 three 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 and memory
+ regions.
+ Please refer to the standard PCI bus binding document for a more detailed
+ explanation.
+
+In addition, the device tree node must have sub-nodes describing each
+PCIe interface, having the following mandatory properties:
+
+Required properties:
+- device_type: Must be "pci"
+- assigned-addresses: Address and size of the port configuration registers
+- reg: Only the first four bytes are used to refer to the correct bus number
+ and device number.
+- #address-cells: Must be 3
+- #size-cells: Must be 2
+- ranges: Sub-ranges distributed from the PCIe controller node. An empty
+ property is sufficient.
+- 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:
+ - sys_ck
+- resets: Must contain an entry for each entry in reset-names.
+ See ../reset/reset.txt for details.
+- reset-names: Must include the following entries:
+ - pcie-reset
+- num-lanes: Number of lanes to use for this port.
+- phys: Must contain an entry for each entry in phy-names.
+- phy-names: Must include an entry for each sub node. Entries are of the form
+ "pcie-phyN": where N ranges from 0 to the value specified for port number.
+ See ../phy/phy-mt7623-pcie.txt for details.
+
+Examples:
+
+SoC dtsi:
+
+ pcie: pcie@1a140000 {
+ compatible = "mediatek,mt7623-pcie";
+ device_type = "pci";
+ reg = <0 0x1a140000 0 0x1000>; /* PCIe shared registers */
+ interrupts = <GIC_SPI 193 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_SPI 194 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_SPI 195 IRQ_TYPE_LEVEL_LOW>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ clocks = <&topckgen CLK_TOP_ETHIF_SEL>;
+ clock-names = "free_ck";
+ power-domains = <&scpsys MT2701_POWER_DOMAIN_HIF>;
+
+ bus-range = <0x00 0xff>;
+ ranges = <0x82000000 0 0x1a142000 0 0x1a142000 0 0x1000 /* Por0 registers */
+ 0x82000000 0 0x1a143000 0 0x1a143000 0 0x1000 /* Por1 registers */
+ 0x82000000 0 0x1a144000 0 0x1a144000 0 0x1000 /* Por2 registers */
+ 0x81000000 0 0x1a160000 0 0x1a160000 0 0x00010000 /* I/O space */
+ 0x83000000 0 0x60000000 0 0x60000000 0 0x10000000>; /* memory space */
+ status = "disabled";
+
+ pcie@1,0 {
+ device_type = "pci";
+ assigned-addresses = <0x82000800 0 0x1a142000 0 0x1000>;
+ reg = <0x0800 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ status = "disabled";
+
+ clocks = <&hifsys CLK_HIFSYS_PCIE0>;
+ clock-names = "sys_ck";
+ resets = <&hifsys MT2701_HIFSYS_PCIE0_RST>;
+ reset-names = "pcie-reset";
+
+ num-lanes = <1>;
+ phys = <&pcie0_phy>;
+ phy-names = "pcie-phy0";
+ };
+
+ pcie@2,0 {
+ device_type = "pci";
+ assigned-addresses = <0x82001000 0 0x1a143000 0 0x1000>;
+ reg = <0x1000 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ status = "disabled";
+
+ clocks = <&hifsys CLK_HIFSYS_PCIE1>;
+ clock-names = "sys_ck";
+ resets = <&hifsys MT2701_HIFSYS_PCIE1_RST>;
+ reset-names = "pcie-reset";
+
+ num-lanes = <1>;
+ phys = <&pcie1_phy>;
+ phy-names = "pcie-phy1";
+ };
+
+ pcie@3,0 {
+ device_type = "pci";
+ assigned-addresses = <0x82001800 0 0x1a144000 0 0x1000>;
+ reg = <0x1800 0 0 0 0>;
+ #address-cells = <3>;
+ #size-cells = <2>;
+ ranges;
+ status = "disabled";
+
+ clocks = <&hifsys CLK_HIFSYS_PCIE2>;
+ clock-names = "sys_ck";
+ resets = <&hifsys MT2701_HIFSYS_PCIE2_RST>;
+ reset-names = "pcie-reset";
+
+ num-lanes = <1>;
+ phys = <&pcie2_phy>;
+ phy-names = "pcie-phy2";
+ };
+ };
+
+Board dts:
+
+ &pcie {
+ status = "okay";
+
+ pcie@1,0 {
+ status = "okay";
+ };
+ };
\ No newline at end of file
--
1.9.1
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