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

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Message-ID: <1552630331-32068-2-git-send-email-Anson.Huang@nxp.com>
Date:   Fri, 15 Mar 2019 06:17:16 +0000
From:   Anson Huang <anson.huang@....com>
To:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
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        Aisheng Dong <aisheng.dong@....com>,
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CC:     dl-linux-imx <linux-imx@....com>
Subject: [PATCH V8 1/4] dt-bindings: watchdog: add i.MX system controller
 watchdog

Add i.MX system controller watchdog binding doc.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
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

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";
+};
-- 
2.7.4