[PATCH v6 1/8] Documentation: add sbsa-gwdt.txt documentation

[fu . wei]

From: Fu Wei <fu.wei@xxxxxxxxxx>

The sbsa-gwdt.txt documentation in devicetree/bindings/watchdog is for
introducing SBSA(Server Base System Architecture) Generic Watchdog
device node info into FDT.

Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx>
---
 .../devicetree/bindings/watchdog/sbsa-gwdt.txt     | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt

diff --git a/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
new file mode 100644
index 0000000..010e5c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
@@ -0,0 +1,36 @@
+* SBSA(Server Base System Architecture) Generic Watchdog
+
+The SBSA Generic Watchdog Timer is used for resetting the system after
+two stages of timeout.
+More details: ARM-DEN-0029 - Server Base System Architecture (SBSA)
+
+Required properties:
+- compatible : Should at least contain "arm,sbsa-gwdt".
+
+- reg : base physical address of the frames and length of memory mapped region.
+
+- reg-names : Should contain the resource reg names to show the order of
+  the values in "reg".
+  Must include the following entries : "refresh", "control".
+
+- interrupts : Should at least contain WS0 interrupt,
+  the WS1 Signal is optional.
+
+- interrupt-names : Should contain the resource interrupt names.
+  Must include the following entries : "ws0". "ws1" is optional.
+
+Optional properties
+- timeout-sec : Watchdog pre-timeout and timeout values (in seconds).
+	The first is timeout values, then pre-timeout.
+
+Example for FVP Foundation Model v8:
+
+watchdog@2a440000 {
+	compatible = "arm,sbsa-gwdt";
+	reg = <0x0 0x2a440000 0 0x1000>,
+	      <0x0 0x2a450000 0 0x1000>;
+	reg-names = "control", "refresh";
+	interrupts = <0 27 4>;
+	interrupt-names = "ws0";
+	timeout-sec = <10 5>;
+};
-- 
1.9.1

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