[PATCH v2 06/19] dt-bindings: interrupt-controller: Add Loongson-3 IOINTC

[Jiaxun Yang]

Document Loongson-3 I/O Interrupt controller.

Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
 .../loongson,ls3-iointc.yaml                  | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml

diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml
new file mode 100644
index 000000000000..c6e58c83181e
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,ls3-iointc.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/interrupt-controller/loongson,ls3-iointc.yaml#";
+$schema: "http://devicetree.org/meta-schemas/core.yaml#";
+
+title: Loongson-3 I/O Interrupt Controller
+
+maintainers:
+  - Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
+
+description: |
+  This interrupt controller is found in the Loongson-3 family of chips as the primary
+  package interrupt source which can route interrupt to interrupt line of cores.
+
+properties:
+  compatible:
+    const: loongson,ls3-iointc
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    description: |
+      Specifies the number of cells needed to encode an interrupt source.
+      Must be 2 or 4.
+      If the system requires describing interrupt line & core mapping, than
+      it must be 4.
+
+      The 1st cell is the hardware interrupt number.
+
+      The 2nd cell is the flags, encoded as follows:
+        bits[3:0] trigger type and level flags.
+          1 = low-to-high edge triggered
+          2 = high-to-low edge triggered
+          4 = active high level-sensitive
+          8 = active low level-sensitive.
+
+      The 3rd is the parent interrupt line that interrupt would map to.
+      As the CPU preserved 4 interrupt lines for I/O, in theory any of the iointc
+      interrupt can be chained to any interrupt lines on a core. But currently
+      we can only map all the interrupt to a single parent, so this cell must be
+      set uniformly for all the child interrupts corresponding to the parent
+      interrupt.
+
+      The 4th is the parent core that interrupt would map to. The interrupt
+      contoller can map any of the interrupt to the specified core on a package.
+      This cell determined the core. It must be the bootcore.
+
+      If the 3rd, 4th cell is not set, it will default to the 0# interrupt line
+      and bootcore.
+
+    enum: [ 2, 4 ]
+
+  interrupts:
+    description:
+      Interrupt source of the CPU interrupt.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+
+
+examples:
+  - |
+    iointc: interrupt-controller@3ff01400 {
+        compatible = "loongson,ls3-io-intc";
+        reg = <0x3ff01400 0x60>;
+        interrupts = <2>;
+        interrupt-controller;
+        #interrupt-cells = <4>;
+    };
+...
-- 
2.22.0