Messages in this thread | | | Date | Wed, 02 Oct 2013 18:42:25 +0200 | From | boris brezillon <> | Subject | Re: [v2,2/4] watchdog: at91sam9_wdt: update device tree doc |
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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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