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SubjectRe: [v2,2/4] watchdog: at91sam9_wdt: update device tree doc
On Fri, Jun 21, 2013 at 03:23:34PM -0000, Boris BREZILLON wrote:
> Add new at91sam9 watchdog properties to the documentation.
>
> Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
> Acked-by: Grant Likely<grant.likely@linaro.org>
>
> ---
> .../devicetree/bindings/watchdog/atmel-wdt.txt | 30 ++++++++++++++++++--
> 1 file changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> index fcdd48f..e043106 100644
> --- a/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/atmel-wdt.txt
> @@ -9,11 +9,37 @@ Required properties:
>
> Optional properties:
> - timeout-sec: contains the watchdog timeout in seconds.
> +- interrupts : Should contain WDT interrupt.
> +- atmel,max-heartbeat-sec : Should contain the maximum heartbeat value in
> + seconds. This value should be less than 16. It is used to compute the
> + WDV field.
> +- atmel,min-heartbeat-sec : Should contain the minimum heartbeat value in
> + seconds. This value should be less than 4 times the max-heartbeat-sec
> + value. It is used to compute the WDD field.

I am a bit at loss about "less than 4 times the max-heartbeat-sec value".
Why would a min-timeout larger than the max-timeout make sense under any
condition ? Do you mean to say that max-heartbeat should be at least four
times the value of min-heartbeat (or that min-heartbeat should be less or
equal to one-forth of max-heartbeat) ?

Guenter

> +- atmel,watchdog-type : Should be "hardware" or "software". Hardware watchdog
> + use the at91 watchdog reset. Software watchdog use the watchdog
> + interrupt to trigger a software reset.
> +- atmel,reset-type : Should be "proc" or "all".
> + "all" : assert peripherals and processor reset signals
> + "proc" : assert the processor reset signal
> + This is valid only when using "hardware" watchdog.
> +- atmel,disable : Should be present if you want to disable the watchdog.
> +- atmel,idle-halt : Should be present if you want to stop the watchdog when
> + entering idle state.
> +- atmel,dbg-halt : Should be present if you want to stop the watchdog when
> + entering debug state.
>
> Example:
> -
> watchdog@fffffd40 {
> compatible = "atmel,at91sam9260-wdt";
> reg = <0xfffffd40 0x10>;
> - timeout-sec = <10>;
> + interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> + timeout-sec = <15>;
> + atmel,watchdog-type = "hardware";
> + atmel,reset-type = "all";
> + atmel,dbg-halt;
> + atmel,idle-halt;
> + atmel,max-heartbeat-sec = <16>;
> + atmel,min-heartbeat-sec = <0>;
> + status = "okay";
> };


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