[PATCH v2 1/2] dt-bindings: add description of Socionext EXIU interrupt controller

Add a description of the External Interrupt Unit (EXIU) interrupt
controller as found on the Socionext SynQuacer SoC.

Signed-off-by: Ard Biesheuvel <redacted>
---
 Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.txt | 32 ++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.txt b/Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.txt
new file mode 100644
index 000000000000..dc3778b6fbee
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.txt

@@ -0,0 +1,32 @@
+Socionext SynQuacer External Interrupt Unit (EXIU)
+
+The Socionext Synquacer SoC has an external interrupt unit (EXIU)
+that forwards a block of 32 configurable input lines to 32 adjacent
+level-high type GICv3 SPIs.
+
+Required properties:
+
+- compatible           : Should be "socionext,synquacer-exiu".
+- reg                  : Specifies base physical address and size of the
+                         control registers.
+- interrupt-controller : Identifies the node as an interrupt controller.
+- #interrupt-cells     : Specifies the number of cells needed to encode an
+                         interrupt source. The value must be 3.
+- interrupt-parent     : phandle of the GIC these interrupts are routed to.
+- socionext,spi-base   : The SPI number of the first SPI of the 32 adjacent
+                         ones the EXIU forwards its interrups to.
+
+Notes:
+
+- Only SPIs can use the EXIU as an interrupt parent.
+
+Example:
+
+	exiu: exiu at 510c0000 {