diff mbox series

[2/2] dt-bindings: watchdog: aspeed: Document aspeed,pre-timeout-irq-us

Message ID 20221021151559.781983-3-eajames@linux.ibm.com
State New
Headers show
Series watchdog: aspeed: Add pre-timeout interrupt support | expand

Commit Message

Eddie James Oct. 21, 2022, 3:15 p.m. UTC
Document this new property for the pre-timeout interrupt.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Comments

Krzysztof Kozlowski Oct. 22, 2022, 4:20 p.m. UTC | #1
On 21/10/2022 11:15, Eddie James wrote:
> Document this new property for the pre-timeout interrupt.

Please convert bindings to DT schema first.

Best regards,
Krzysztof
Rob Herring (Arm) Oct. 24, 2022, 6:44 p.m. UTC | #2
On Fri, Oct 21, 2022 at 10:15:59AM -0500, Eddie James wrote:
> Document this new property for the pre-timeout interrupt.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>
> ---
>  Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> index a8197632d6d2..81d2c35ca7e3 100644
> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> @@ -40,12 +40,17 @@ Optional properties:
>  			specified no external signal is sent.
>   - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
>  
> -Optional properties for AST2500-compatible watchdogs:
> +Optional properties for AST2500 and AST2600 compatible watchdogs:
>   - aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
>  			 drive type to push-pull. The default is open-drain.
>   - aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
>  			   is configured as push-pull, then set the pulse
>  			   polarity to active-high. The default is active-low.
> + - aspeed,pre-timeout-irq-us: If aspeed,pre-timeout-irq-us is non-zero, the
> +			      pre-timeout interrupt will be enabled for the
> +			      watchdog. The interrupt will fire the specified
> +			      number of microseconds before the watchdog expires
> +			      and trigger a kernel panic.

A pre-timeout interrupt is fairly common. Come up with a common property 
please. You'll need to be clear if the time is from wdog restart or time 
before final timeout. 

Rob
Guenter Roeck Oct. 24, 2022, 7:03 p.m. UTC | #3
On 10/24/22 11:44, Rob Herring wrote:
> On Fri, Oct 21, 2022 at 10:15:59AM -0500, Eddie James wrote:
>> Document this new property for the pre-timeout interrupt.
>>
>> Signed-off-by: Eddie James <eajames@linux.ibm.com>
>> ---
>>   Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> index a8197632d6d2..81d2c35ca7e3 100644
>> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
>> @@ -40,12 +40,17 @@ Optional properties:
>>   			specified no external signal is sent.
>>    - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
>>   
>> -Optional properties for AST2500-compatible watchdogs:
>> +Optional properties for AST2500 and AST2600 compatible watchdogs:
>>    - aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
>>   			 drive type to push-pull. The default is open-drain.
>>    - aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
>>   			   is configured as push-pull, then set the pulse
>>   			   polarity to active-high. The default is active-low.
>> + - aspeed,pre-timeout-irq-us: If aspeed,pre-timeout-irq-us is non-zero, the
>> +			      pre-timeout interrupt will be enabled for the
>> +			      watchdog. The interrupt will fire the specified
>> +			      number of microseconds before the watchdog expires
>> +			      and trigger a kernel panic.
> 
> A pre-timeout interrupt is fairly common. Come up with a common property
> please. You'll need to be clear if the time is from wdog restart or time
> before final timeout.
> 

It would be nice if it would match the semantics of the existing
pretimeout attribute in the watchdog core.

Guenter
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
index a8197632d6d2..81d2c35ca7e3 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -40,12 +40,17 @@  Optional properties:
 			specified no external signal is sent.
  - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
 
-Optional properties for AST2500-compatible watchdogs:
+Optional properties for AST2500 and AST2600 compatible watchdogs:
  - aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
 			 drive type to push-pull. The default is open-drain.
  - aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
 			   is configured as push-pull, then set the pulse
 			   polarity to active-high. The default is active-low.
+ - aspeed,pre-timeout-irq-us: If aspeed,pre-timeout-irq-us is non-zero, the
+			      pre-timeout interrupt will be enabled for the
+			      watchdog. The interrupt will fire the specified
+			      number of microseconds before the watchdog expires
+			      and trigger a kernel panic.
 
 Example: