Add i.MX8QXP system controller watchdog binding.

Signed-off-by: Anson Huang <anson.hu...@nxp.com>
---
Changes since V1:
        - update dts node name to "watchdog";
---
 Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt 
b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index 4b79751..f388ec6 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -136,6 +136,12 @@ Required properties:
                           resource id for thermal driver to get temperature via
                           SCU IPC.
 
+Watchdog bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible: should be "fsl,imx8qxp-sc-wdt";
+
 Example (imx8qxp):
 -------------
 lsio_mu1: mailbox@5d1c0000 {
@@ -188,6 +194,10 @@ firmware {
                        tsens-num = <1>;
                        #thermal-sensor-cells = <1>;
                };
+
+               watchdog: watchdog {
+                       compatible = "fsl,imx8qxp-sc-wdt";
+               };
        };
 };
 
-- 
2.7.4

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