linux-kernel - Re: [PATCH 2/2] ARM: mvebu: Added dts defintion for Lenovo Iomega ix4-300d NAS

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Message-ID: <20140724132954.GF28485@lunn.ch>
Date:	Thu, 24 Jul 2014 15:29:54 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Benoit Masson <benoitm@...enite.com>,
	Andrew Lunn <andrew@...n.ch>,
	Benoit Masson <yahoo@...enite.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...glemail.com>
Subject: Re: [PATCH 2/2] ARM: mvebu: Added dts defintion for Lenovo Iomega
 ix4-300d NAS

> > Well about the issue, we patch the device tree for the i2c quirk only for
> > the openblock AX3.
> 
> Ahhh, that's right.  I need to slow down and dig a bit more. :(
> 
> > If I remember well it was because the device tree was already written
> > for this board before we found there was an issue with the A0 version
> > of the CPU. 
> 
> No, it's because we didn't think any manufacturers would be silly enough
> to use the a0 in production.  That assumption worked out well. :-P
> 
> > The rule was that for new boards then they have to set the marvell,mv78230-a0-i2c
> > compatible string. I also didn't expect that we found "new" product using the A0 version.
> > 
> > We have 3 options now:
> > 
> > - remove the check on the openblock AX3 board and always try to apply the quirck for A0 version
> > - add a check for this new board in the mvebu_dt_init function
> > - let the compatible string marvell,mv78230-a0-i2c in this dts
> > 
> > I would prefer the option 1 but I fear that Arnd would prefer the 2 other options.
> 
> I like option 1 and 3.  Option 3 is a *correct* description of the
> hardware, and should be done.  Option 1 makes Linux user-friendly for boards
> that are exactly the same, but changed out SoC stepping mid-production.

I would prefer 1 as well. It is the SoC that has the problem, not the
board. So we should not be making the quirk board specific.

       Andrew
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