dt-bindings: interrupt-controller: C-SKY APB intc

 - Dt-bindings doc about C-SKY apb bus interrupt controller.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
new file mode 100644
index 000000000000..44286dcbac62
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/csky,apb-intc.txt
@@ -0,0 +1,62 @@
+==============================
+C-SKY APB Interrupt Controller
+==============================
+
+C-SKY APB Interrupt Controller is a simple soc interrupt controller
+on the apb bus and we only use it as root irq controller.
+
+ - csky,apb-intc is used in a lot of csky fpgas and socs, it support 64 irq nums.
+ - csky,dual-apb-intc consists of 2 apb-intc and 128 irq nums supported.
+ - csky,gx6605s-intc is gx6605s soc internal irq interrupt controller, 64 irq nums.
+
+=============================
+intc node bindings definition
+=============================
+
+        Description: Describes APB interrupt controller
+
+        PROPERTIES
+
+        - compatible
+                Usage: required
+                Value type: <string>
+                Definition: must be "csky,apb-intc"
+                                    "csky,dual-apb-intc"
+                                    "csky,gx6605s-intc"
+        - #interrupt-cells
+                Usage: required
+                Value type: <u32>
+                Definition: must be <1>
+        - reg
+                Usage: required
+                Value type: <u32 u32>
+                Definition: <phyaddr size> in soc from cpu view
+        - interrupt-controller:
+                Usage: required
+        - csky,support-pulse-signal:
+                Usage: select
+                Description: to support pulse signal flag
+
+Examples:
+---------
+
+        intc: interrupt-controller@500000 {
+                compatible = "csky,apb-intc";
+                #interrupt-cells = <1>;
+                reg = <0x00500000 0x400>;
+                interrupt-controller;
+        };
+
+        intc: interrupt-controller@500000 {
+                compatible = "csky,dual-apb-intc";
+                #interrupt-cells = <1>;
+                reg = <0x00500000 0x400>;
+                interrupt-controller;
+        };
+
+        intc: interrupt-controller@500000 {
+                compatible = "csky,gx6605s-intc";
+                #interrupt-cells = <1>;
+                reg = <0x00500000 0x400>;
+                interrupt-controller;
+        };