[PATCH 1/2 v3] dt/bindings: Add bindings for Layerscape SCFG MSI

[Minghuan Lian]

Some Layerscape SoCs use a simple MSI controller implementation.
It contains only two SCFG register to trigger and describe a
group 32 MSI interrupts. The patch adds bindings to describe
the controller.

Signed-off-by: Minghuan Lian <Minghuan.Lian at nxp.com>
---
 .../interrupt-controller/fsl,ls-scfg-msi.txt       | 23 ++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,ls-scfg-msi.txt

diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-scfg-msi.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-scfg-msi.txt
new file mode 100644
index 0000000..0c41151
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-scfg-msi.txt
@@ -0,0 +1,23 @@
+* Freescale Layerscape SCFG PCIe MSI controller
+
+Required properties:
+
+- compatible: should be "fsl,<soc-name>-msi" to identify
+	      Layerscape PCIe MSI controller block such as:
+              "fsl,1s1021a-msi"
+              "fsl,1s1043a-msi"
+- msi-controller: indicates that this is a PCIe MSI controller node
+- reg: physical base address of the controller and length of memory mapped.
+- interrupts: A interrupt of the controller.
+
+Each PCIe node needs to have property msi-parent that points to
+MSI controller node
+
+Examples:
+
+	msi1: msi-controller at 1571000 {
+		compatible = "fsl,1s1043a-msi";
+		reg = <0x0 0x1571000 0x0 0x8>,
+		msi-controller;
+		interrupts = <0 116 0x4>;
+	};
-- 
1.9.1