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>

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 (file)
index 0000000..44286dc
--- /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;
+       };