[PATCH v12 1/4] Documentation: add sbsa-gwdt driver documentation

[Guenter Roeck]

On 02/16/2016 12:36 AM, fu.wei at linaro.org wrote:
> From: Fu Wei <fu.wei at 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 at arndb.de>
> Acked-by: Rob Herring <robh at kernel.org>
> Signed-off-by: Fu Wei <fu.wei at linaro.org>

Reviewed-by: Guenter Roeck <linux at roeck-us.net>

> ---
>   .../devicetree/bindings/watchdog/sbsa-gwdt.txt     | 31 ++++++++++++++++++++++
>   Documentation/watchdog/watchdog-parameters.txt     |  7 +++++
>   2 files changed, 38 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..6f2d5f9
> --- /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 at 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 9f9ec9f..ce7ae4e 100644
> --- a/Documentation/watchdog/watchdog-parameters.txt
> +++ b/Documentation/watchdog/watchdog-parameters.txt
> @@ -284,6 +284,13 @@ 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
>