linux-kernel - Re: [RESEND] [PATCH v2 1/2] arm: devtree: Set system

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Message-Id: <201507061423.23505@pali>
Date:	Mon, 6 Jul 2015 14:23:23 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Rob Herring <robherring2@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Pavel Machek <pavel@....cz>,
	Andreas Färber <afaerber@...e.de>,
	linux-omap@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org
Subject: Re: [RESEND] [PATCH v2 1/2] arm: devtree: Set system_rev from DT revision

On Thursday 25 June 2015 07:01:38 Tony Lindgren wrote:
> * Pali Rohár <pali.rohar@...il.com> [150506 04:45]:
> > On Wednesday 06 May 2015 13:04:01 Arnd Bergmann wrote:
> > > > It needs to be done in this code, so "system_rev" variable is
> > > > set properly...
> > > 
> > > What I mean is which code accesses this variable that early?
> > 
> > ATAG code is doing it at same early stage, so I added it to same
> > early stage...
> 
> Yes we should do this early like the other atags.
> 
> > > > > Also, it seems strange to have a string property and then use
> > > > > kstrtouint to convert it into a number. I think it should
> > > > > either be specified in a DT binding to be a string and then
> > > > > have the kernel not assume that it is a number, or we should
> > > > > define it to be binary.
> > > > > 
> > > > >       Arnd
> > > > 
> > > > Variable "system_rev" is number and it always was. So chaning
> > > > type will break more parts.
> > > > 
> > > > And it is string DT property to be human readable. Some other
> > > > developers suggested for v2 to change it to string (from
> > > > number).
> > > 
> > > Both of them would be human readable, you just use something else
> > > to read them ;-)
> > > 
> > > If we have a string here, we should just change all uses of
> > > system_rev
> 
> > > in the kernel accordingly, there are only a few of them:
> Let's just keep it as a hex as it was. After all it's an existing
> interface in /proc that user space programs may expect to be in
> hex format already.
> 
> Pali, care to repost the whole set again right after -rc1 with
> with rev property naming and documentation added? Just keep it
> as hex and let's forget any string conversion.
> 
> Regards,
> 
> Tony

Hello Tony,

into which file should I put documentation about new DT properties?

-- 
Pali Rohár
pali.rohar@...il.com

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