From: Fu Wei fu.wei@linaro.org
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 Signed-off-by: Fu Wei fu.wei@linaro.org --- .../devicetree/bindings/watchdog/sbsa-gwdt.txt | 34 ++++++++++++++++++++++ Documentation/watchdog/watchdog-parameters.txt | 6 ++++ 2 files changed, 40 insertions(+)
diff --git a/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt new file mode 100644 index 0000000..2da63db --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt @@ -0,0 +1,34 @@ +* 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 and pre-timeout values. + If used, at least first timeout value (in seconds) must be provided. + A second optional value (in seconds) may also be provided and + will be used as the pre-timeout value, if it is given. + +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 = <60 30>; +}; diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt index 9f9ec9f..e62c8c4 100644 --- a/Documentation/watchdog/watchdog-parameters.txt +++ b/Documentation/watchdog/watchdog-parameters.txt @@ -284,6 +284,12 @@ 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 60s) +pretimeout: Watchdog pretimeout in seconds. (default 30s) +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