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authorFu Wei <fu.wei@linaro.org>2016-02-29 16:46:47 +0800
committerWim Van Sebroeck <wim@iguana.be>2016-03-04 20:23:14 +0100
commit2fc94b5f229a5d9d1db7fd91d0a4808cfeb915f5 (patch)
treee905e09129f78db5811090a8cd8b273667272e67
parentc36a483d80072f7efdd09e94dd733120dc8ecfb2 (diff)
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Documentation: add sbsa-gwdt driver documentation
The sbsa-gwdt.txt documentation in devicetree/bindings/watchdog is for introducing SBSA(Server Base System Architecture) Generic Watchdog device node info into FDT. Also add sbsa-gwdt introduction in watchdog-parameters.txt Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Fu Wei <fu.wei@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
-rw-r--r--Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt31
-rw-r--r--Documentation/watchdog/watchdog-parameters.txt7
2 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
new file mode 100644
index 000000000000..6f2d5f91964d
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
@@ -0,0 +1,31 @@
+* SBSA (Server Base System Architecture) Generic Watchdog
+
+The SBSA Generic Watchdog Timer is used to force a reset of the system
+after two stages of timeout have elapsed. A detailed definition of the
+watchdog timer can be found in the ARM document: ARM-DEN-0029 - Server
+Base System Architecture (SBSA)
+
+Required properties:
+- compatible: Should at least contain "arm,sbsa-gwdt".
+
+- reg: Each entry specifies the base physical address of a register frame
+ and the length of that frame; currently, two frames must be defined,
+ in this order:
+ 1: Watchdog control frame;
+ 2: Refresh frame.
+
+- interrupts: Should contain the Watchdog Signal 0 (WS0) SPI (Shared
+ Peripheral Interrupt) number of SBSA Generic Watchdog.
+
+Optional properties
+- timeout-sec: Watchdog timeout values (in seconds).
+
+Example for FVP Foundation Model v8:
+
+watchdog@2a440000 {
+ compatible = "arm,sbsa-gwdt";
+ reg = <0x0 0x2a440000 0 0x1000>,
+ <0x0 0x2a450000 0 0x1000>;
+ interrupts = <0 27 4>;
+ timeout-sec = <30>;
+};
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index 53dfc73e0171..beb0ae7bb3e6 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -289,6 +289,13 @@ sbc_fitpc2_wdt:
margin: Watchdog margin in seconds (default 60s)
nowayout: Watchdog cannot be stopped once started
-------------------------------------------------
+sbsa_gwdt:
+timeout: Watchdog timeout in seconds. (default 10s)
+action: Watchdog action at the first stage timeout,
+ set to 0 to ignore, 1 to panic. (default=0)
+nowayout: Watchdog cannot be stopped once started
+ (default=kernel config parameter)
+-------------------------------------------------
sc1200wdt:
isapnp: When set to 0 driver ISA PnP support will be disabled (default=1)
io: io port