[V8,1/4] dt-bindings: watchdog: add i.MX system controller watchdog

Commit Message

Anson Huang March 15, 2019, 6:17 a.m. UTC

Add i.MX system controller watchdog binding doc.

Signed-off-by: Anson Huang <[e-mail]>
---
New patch, as watchdog node is moved out of SCU, so we need to add binding doc for it.
---
 .../devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt  | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt

Patch

diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt b/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt
new file mode 100644
index 0000000..e461c85
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-sc-wdt.txt
@@ -0,0 +1,20 @@ 
+* Freescale i.MX System Controller Watchdog
+
+i.MX system controller watchdog is for i.MX SoCs with system controller inside,
+the watchdog is managed by system controller, users can ONLY communicate with
+system controller from secure mode for watchdog operations, so Linux i.MX system
+controller watchdog driver will call ARM SMC API and trap into ARM-Trusted-Firmware
+for watchdog operations, ARM-Trusted-Firmware is running at secure EL3 mode and
+it will request system controller to execute the watchdog operation passed from
+Linux kernel.
+
+Required properties:
+- compatible:	Should be :
+		"fsl,imx8qxp-sc-wdt"
+		followed by "fsl,imx-sc-wdt";
+
+Examples:
+
+watchdog {
+	compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
+};