Commit 2fc94b5f authored by Fu Wei's avatar Fu Wei Committed by Wim Van Sebroeck

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: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarFu Wei <fu.wei@linaro.org>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent c36a483d
* 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>;
};
...@@ -289,6 +289,13 @@ sbc_fitpc2_wdt: ...@@ -289,6 +289,13 @@ sbc_fitpc2_wdt:
margin: Watchdog margin in seconds (default 60s) margin: Watchdog margin in seconds (default 60s)
nowayout: Watchdog cannot be stopped once started 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: sc1200wdt:
isapnp: When set to 0 driver ISA PnP support will be disabled (default=1) isapnp: When set to 0 driver ISA PnP support will be disabled (default=1)
io: io port io: io port
......
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