irqchip: gic-v2m: Add DT bindings for GICv2m

Update the GIC DT bindings to support GICv2m.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
[maz: split DT patch from main driver, updated changelog]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1416941243-7181-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
index c7d2fa1..375147e 100644 (file)
--- a/Documentation/devicetree/bindings/arm/gic.txt
+++ b/Documentation/devicetree/bindings/arm/gic.txt
@@ -96,3 +96,56 @@ Example:
                      <0x2c006000 0x2000>;
                interrupts = <1 9 0xf04>;
        };
+
+
+* GICv2m extension for MSI/MSI-x support (Optional)
+
+Certain revisions of GIC-400 supports MSI/MSI-x via V2M register frame(s).
+This is enabled by specifying v2m sub-node(s).
+
+Required properties:
+
+- compatible       : The value here should contain "arm,gic-v2m-frame".
+
+- msi-controller    : Identifies the node as an MSI controller.
+
+- reg              : GICv2m MSI interface register base and size
+
+Optional properties:
+
+- arm,msi-base-spi  : When the MSI_TYPER register contains an incorrect
+                     value, this property should contain the SPI base of
+                     the MSI frame, overriding the HW value.
+
+- arm,msi-num-spis  : When the MSI_TYPER register contains an incorrect
+                     value, this property should contain the number of
+                     SPIs assigned to the frame, overriding the HW value.
+
+Example:
+
+       interrupt-controller@e1101000 {
+               compatible = "arm,gic-400";
+               #interrupt-cells = <3>;
+               #address-cells = <2>;
+               #size-cells = <2>;
+               interrupt-controller;
+               interrupts = <1 8 0xf04>;
+               ranges = <0 0 0 0xe1100000 0 0x100000>;
+               reg = <0x0 0xe1110000 0 0x01000>,
+                     <0x0 0xe112f000 0 0x02000>,
+                     <0x0 0xe1140000 0 0x10000>,
+                     <0x0 0xe1160000 0 0x10000>;
+               v2m0: v2m@0x8000 {
+                       compatible = "arm,gic-v2m-frame";
+                       msi-controller;
+                       reg = <0x0 0x80000 0 0x1000>;
+               };
+
+               ....
+
+               v2mN: v2m@0x9000 {
+                       compatible = "arm,gic-v2m-frame";
+                       msi-controller;
+                       reg = <0x0 0x90000 0 0x1000>;
+               };
+       };