linux-kernel - Re: [PATCH 1/5] Documentation: DT: Add optional 'timeout-sec' property for sp805

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Date:   Wed, 23 May 2018 09:25:49 -0700
From:   Ray Jui <ray.jui@...adcom.com>
To:     Robin Murphy <robin.murphy@....com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Frank Rowand <frowand.list@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     devicetree@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/5] Documentation: DT: Add optional 'timeout-sec'
 property for sp805



On 5/23/2018 3:57 AM, Robin Murphy wrote:
> On 22/05/18 19:47, Ray Jui wrote:
>> Update the SP805 binding document to add optional 'timeout-sec'
>> devicetree property
>>
>> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
>> Reviewed-by: Scott Branden <scott.branden@...adcom.com>
>> ---
>>   Documentation/devicetree/bindings/watchdog/sp805-wdt.txt | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt 
>> b/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
>> index edc4f0e..f898a86 100644
>> --- a/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
>> +++ b/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
>> @@ -19,6 +19,8 @@ Required properties:
>>   Optional properties:
>>   - interrupts : Should specify WDT interrupt number.
>> +- timeout-sec : Should specify default WDT timeout in seconds. If 
>> unset, the
>> +                default timeout is 30 seconds
> 
> According to the SP805 TRM, the default interval is dependent on the 
> rate of WDOGCLK, but would typically be a lot longer than that :/
> 
> On a related note, anyone have any idea why we seem to have two subtly 
> different SP805 bindings defined?

Interesting, I did not even know that until you pointed this out (and 
it's funny that I found that I actually reviewed arm,sp805.txt 
internally in Broadcom code review).

It looks like one was done by Bhupesh Sharma (sp805-wdt.txt) and the 
other was done by Anup Patel (arm,sp805.txt). Both were merged at the 
same time around March 20, 2016: 915c56bc01d6. I'd assume both were sent 
out at around the same time.

It sounds like we should definitely remove one of them. Given that 
sp805-wdt.txt appears to have more detailed descriptions on the use of 
the clocks, should we remove arm,sp805.txt?

Thanks,

Ray

> 
> Robin.
> 
>>   Examples:
>>