[PATCH v1 2/2] dt-bindings: pcie: Add documentation for Mediatek PCIe

[Ryder Lee]

Add binding document for Mediatek PCIe Gen2 v1 host controller driver.

Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
---
 .../bindings/pci/mediatek,gen2v1-pcie.txt          | 174 +++++++++++++++++++++
 1 file changed, 174 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/mediatek,gen2v1-pcie.txt

diff --git a/Documentation/devicetree/bindings/pci/mediatek,gen2v1-pcie.txt b/Documentation/devicetree/bindings/pci/mediatek,gen2v1-pcie.txt
new file mode 100644
index 0000000..545d8cf
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/mediatek,gen2v1-pcie.txt
@@ -0,0 +1,174 @@
+Mediatek Gen2 V1 PCIe controller
+
+PCIe subsys supports single root complex (RC) with 3 Root Ports. Each root
+ports supports a Gen2 1-lane Link. It includes one Host/PCI bridge and 3
+PCIe MAC. Each port has PIPE interface to PHY. There are 3 bus master for
+data access and 1 bus slave for Configuration and Status Register access.
+
+This controller is available on MT7623 series SoCs.
+  
+Required properties:
+- compatible: Should contain "mediatek,gen2v1-pcie".
+- device_type: Must be "pci"
+- reg: Base addresses and lengths of the PCIe 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)
+- #interrupt-cells: Size representation for interrupts (must be 1)
+- interrupts: Three interrupt outputs of the controller. Must contain an
+  entry for each entry in the interrupt-names property.
+- 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:
+  - free_ck	:for reference clock of PCIe subsys
+  - sys_ck0	:for clock of Port0 MAC
+  - sys_ck1	:for clock of Port1 MAC
+  - sys_ck2	:for clock of Port2 MAC
+- 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-rst0	:port0 reset
+  - pcie-rst1	:port1 reset
+  - pcie-rst2	:port2 reset
+- phys: list of PHY specifiers (used by generic PHY framework)
+- phy-names : must be "pcie-phy0", "pcie-phy1", "pcie-phyN".. based on the
+  number of PHYs as specified in *phys* property.
+- 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 port 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
+- #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.
+- ranges: Sub-ranges distributed from the PCIe controller node. An empty
+  property is sufficient.
+- num-lanes: Number of lanes to use for this port.
+
+Examples:
+
+SoC dtsi:
+
+	hifsys: syscon@1a000000 {
+		compatible = "mediatek,mt7623-hifsys", "syscon";
+		reg = <0 0x1a000000 0 0x1000>;
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
+	pcie: pcie-controller@1a140000 {
+		compatible = "mediatek,gen2v1-pcie";
+		device_type = "pci";
+		reg = <0 0x1a140000 0 0x1000>; /* PCIe shared registers */
+		#address-cells = <3>;
+		#size-cells = <2>;
+		#interrupt-cells = <1>;
+		interrupts = <GIC_SPI 193 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_SPI 194 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_SPI 195 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-map-mask = <0xf800 0 0 0>;
+		interrupt-map = <0x0000 0 0 0 &gic GIC_SPI 193 IRQ_TYPE_NONE>,
+				 <0x0800 0 0 0 &gic GIC_SPI 194 IRQ_TYPE_NONE>,
+			     <0x1000 0 0 0 &gic GIC_SPI 195 IRQ_TYPE_NONE>;
+		clocks = <&topckgen CLK_TOP_ETHIF_SEL>,
+			     <&hifsys CLK_HIFSYS_PCIE0>,
+				 <&hifsys CLK_HIFSYS_PCIE1>,
+				 <&hifsys CLK_HIFSYS_PCIE2>;
+		clock-names = "free_ck", "sys_ck0", "sys_ck1", "sys_ck2";
+		resets = <&hifsys MT2701_HIFSYS_PCIE0_RST>,
+			     <&hifsys MT2701_HIFSYS_PCIE1_RST>,
+			     <&hifsys MT2701_HIFSYS_PCIE2_RST>;
+		reset-names = "pcie-rst0", "pcie-rst1", "pcie-rst2";
+		phys = <&pcie0_phy>, <&pcie1_phy>, <&pcie2_phy>;
+		phy-names = "pcie-phy0", "pcie-phy1", "pcie-phy2";
+		power-domains = <&scpsys MT2701_POWER_DOMAIN_HIF>;
+		bus-range = <0x00 0xff>;
+		ranges = <0x82000000 0 0x1a142000 0 0x1a142000 0 0x1000 /* Port0 registers */
+			  0x82000000 0 0x1a143000 0 0x1a143000 0 0x1000 /* Port1 registers */
+			  0x82000000 0 0x1a144000 0 0x1a144000 0 0x1000 /* Port2 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 = <0x82000000 0 0x1a142000 0 0x1000>;
+			reg = <0x0000 0 0 0 0>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0 0 0 0 &gic GIC_SPI 193 IRQ_TYPE_NONE>;
+			ranges;
+			num-lanes = <1>;
+			status = "disabled";
+		};
+
+		pcie@2,0 {
+			device_type = "pci";
+			assigned-addresses = <0x82000800 0 0x1a143000 0 0x1000>;
+			reg = <0x0800 0 0 0 0>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0 0 0 0 &gic GIC_SPI 194 IRQ_TYPE_NONE>;
+			ranges;
+			num-lanes = <1>;
+			status = "disabled";
+		};
+
+		pcie@3,0 {
+			device_type = "pci";
+			assigned-addresses = <0x82001000 0 0x1a144000 0 0x1000>;
+			reg = <0x1000 0 0 0 0>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			#interrupt-cells = <1>;
+			interrupt-map-mask = <0 0 0 0>;
+			interrupt-map = <0 0 0 0 &gic GIC_SPI 195 IRQ_TYPE_NONE>;
+			ranges;
+			num-lanes = <1>;
+			status = "disabled";
+		};
+	};
+
+Board dts:
+
+	&pcie {
+		status = "okay";
+
+		pcie@1,0 {
+			status = "okay";
+		};
+	};
-- 
1.9.1