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

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Date:   Wed, 23 May 2018 13:59:44 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Mark Rutland <mark.rutland@....com>,
        Frank Rowand <frowand.list@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, 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 Wed, May 23, 2018 at 09:25:49AM -0700, Ray Jui wrote:
> 
> 
> 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?

Sigh.

> 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?

Take whichever text you like, but I prefer filenames using the 
compatible string and the correct string is 'arm,sp805' because '-wdt' 
is redundant. You can probably safely just update all the dts files with 
'arm,sp805' and just remove 'arm,sp805-wdt' because it is not actually 
used (as the ID registers are).

Rob