linux-kernel - Re: [PATCH v7 1/4] Documentation: dt-bindings: Describe SROMc configuration

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Date:	Wed, 11 Nov 2015 14:43:12 -0600
From:	Rob Herring <robh+dt@...nel.org>
To:	Pavel Fedin <p.fedin@...sung.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: Re: [PATCH v7 1/4] Documentation: dt-bindings: Describe SROMc configuration

On Wed, Nov 11, 2015 at 12:44 AM, Pavel Fedin <p.fedin@...sung.com> wrote:
>  Hello!
>
>> > +- samsung,srom-timing : array of 6 integers, specifying bank timings in the
>> > +                        following order: Tacp, Tcah, Tcoh, Tacc, Tcos, Tacs.
>> > +                        Each value is specified in cycles and has the following
>> > +                        meaning and valid range:
>> > +                        Tacp : Page mode access cycle at Page mode (0 - 15)
>> > +                        Tcah : Address holding time after CSn (0 - 15)
>> > +                        Tcoh : Chip selection hold on OEn (0 - 15)
>> > +                        Tacc : Access cycle (0 - 31, the actual time is N + 1)
>> > +                        Tcos : Chip selection set-up before OEn (0 - 15)
>> > +                        Tacs : Address set-up before CSn (0 - 15)
>>
>> This is not easily extended. Perhaps a property per value instead.
>
>  We had a discussion with Krzysztof about it, he agreed with this form of the property.
> My concern was that it's just too much typing, and makes little sense because these
> settings always go together. If register layout changes, or parameter set changes in
> incompatible way, then it's another device, not exynos-srom anymore.
>  So would you agree with that, or is your position strong?

I'm thinking for a new version of the controller which could add (or
remove) new timing parameters, but then I guess you can interpret the
field differently based on the compatible string. Anyway, your problem
to deal with.

Rob
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