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SubjectRe: [v2,2/4] watchdog: at91sam9_wdt: update device tree doc
On 02/10/2013 17:51, Guenter Roeck wrote:
> 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) ?
That's exactely what I meant (should be less or equal to one-forth of
max-heartbeat).
I'll fix it.

> 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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