[PATCH v4 3/4] documentation: dts: Add the device tree binding for APM X-Gene v1 PCIe MSI device tree node

[Duc Dang]

The driver for this binding is under 'drivers/pci/host/pci-xgene-msi.c'

Signed-off-by: Duc Dang <dhdang@xxxxxxx>
Signed-off-by: Tanmay Inamdar <tinamdar@xxxxxxx>
---
 .../devicetree/bindings/pci/xgene-pci-msi.txt      | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/xgene-pci-msi.txt

diff --git a/Documentation/devicetree/bindings/pci/xgene-pci-msi.txt b/Documentation/devicetree/bindings/pci/xgene-pci-msi.txt
new file mode 100644
index 0000000..0ffdcb3
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/xgene-pci-msi.txt
@@ -0,0 +1,63 @@
+* AppliedMicro X-Gene PCIe MSI interface
+
+Required properties:
+
+- compatible: should contain "apm,xgene1-msi" to identify the core.
+- msi-controller: indicates that this is X-Gene1 PCIe MSI controller node
+- reg: A list of physical base address and length for each set of controller
+       registers.
+- interrupts: A list of interrupt outputs of the controller.
+
+Each PCIe node needs to have property msi-parent that points to msi controller node
+
+Examples:
+
+SoC DTSI:
+
+	+ MSI node:
+	msi@79000000 {
+		compatible = "apm,xgene1-msi";
+		msi-controller;
+		reg = <0x00 0x79000000 0x0 0x900000>;
+		interrupts = <  0x0 0x10 0x4
+				0x0 0x11 0x4
+				0x0 0x12 0x4
+				0x0 0x13 0x4
+				0x0 0x14 0x4
+				0x0 0x15 0x4
+				0x0 0x16 0x4
+				0x0 0x17 0x4
+				0x0 0x18 0x4
+				0x0 0x19 0x4
+				0x0 0x1a 0x4
+				0x0 0x1b 0x4
+				0x0 0x1c 0x4
+				0x0 0x1d 0x4
+				0x0 0x1e 0x4
+				0x0 0x1f 0x4>;
+	};
+
+	+ PCIe controller node with msi-parent property pointing to MSI node:
+	pcie0: pcie@1f2b0000 {
+		status = "disabled";
+		device_type = "pci";
+		compatible = "apm,xgene-storm-pcie", "apm,xgene-pcie";
+		#interrupt-cells = <1>;
+		#size-cells = <2>;
+		#address-cells = <3>;
+		reg = < 0x00 0x1f2b0000 0x0 0x00010000   /* Controller registers */
+			0xe0 0xd0000000 0x0 0x00040000>; /* PCI config space */
+		reg-names = "csr", "cfg";
+		ranges = <0x01000000 0x00 0x00000000 0xe0 0x10000000 0x00 0x00010000   /* io */
+			  0x02000000 0x00 0x80000000 0xe1 0x80000000 0x00 0x80000000>; /* mem */
+		dma-ranges = <0x42000000 0x80 0x00000000 0x80 0x00000000 0x00 0x80000000
+			      0x42000000 0x00 0x00000000 0x00 0x00000000 0x80 0x00000000>;
+		interrupt-map-mask = <0x0 0x0 0x0 0x7>;
+		interrupt-map = <0x0 0x0 0x0 0x1 &gic 0x0 0xc2 0x1
+				 0x0 0x0 0x0 0x2 &gic 0x0 0xc3 0x1
+				 0x0 0x0 0x0 0x3 &gic 0x0 0xc4 0x1
+				 0x0 0x0 0x0 0x4 &gic 0x0 0xc5 0x1>;
+		dma-coherent;
+		clocks = <&pcie0clk 0>;
+		msi-parent= <&msi>;
+	};
-- 
1.9.1

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