[PATCH V4 1/4] dt-bindings: fsl: scu: add rtc binding

[Anson Huang]

NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
system controller, the system controller is in charge of system
power, clock and secure RTC etc. management, Linux kernel
has to communicate with system controller via MU (message unit)
IPC to do RTC operation, this patch adds binding doc for i.MX
system controller RTC driver.

Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
---
ChangeLog:
V3->V4:
  *move rtc binding doc to scu binding doc since it is belonging to SCU.
  *change compatible name to start with "fsl" instead of "nxp" to align with other nodes in dtsi.
 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 c20f38e..3f3d697 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -106,6 +106,12 @@ Required properties for Pinctrl sub nodes:
 [2] Documentation/devicetree/bindings/power/power_domain.txt
 [3] Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
 
+RTC bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible: should be "fsl,imx8qxp-sc-rtc";
+
 Example (imx8qxp):
 -------------
 lsio_mu1: mailbox@5d1c0000 {
@@ -148,6 +154,10 @@ firmware {
 			compatible = "fsl,imx8qxp-scu-pd";
 			#power-domain-cells = <1>;
 		};
+
+		rtc: rtc {
+			compatible = "fsl,imx8qxp-sc-rtc";
+		};
 	};
 };
 
-- 
2.7.4