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

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Message-ID: <6028388.mjACYPxFta@wuerfel>
Date:	Mon, 28 Jul 2014 13:02:47 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Benoit Masson <benoitm@...enite.com>
Cc:	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, jason@...edaemon.net,
	gregory.clement@...e-electrons.com,
	sebastian.hesselbarth@...glemail.com
Subject: Re: [PATCH 2/2] ARM: mvebu: Added dts defintion for Lenovo Iomega ix4-300d NAS

On Monday 28 July 2014 12:50:47 Benoit Masson wrote:
> > 
> > It should still list both "marvell,mv78230-i2c" and "marvell,mv64xxx-i2c",
> > as the generic name may not be enough to describe the register layout
> > correctly.
> 
> I tend to disagree since the dts include the armada-xp.dtsi, which already declare
> 
> "i2c0: i2c@...00 {
>                                 compatible = "marvell,mv78230-i2c", "marvell,mv64xxx-i2c";
>                                 reg = <0x11000 0x100>;
>                         };
> "
> 
> I tested the dts on the device and it does inherits the i2c declaration, did I miss something here ?
> 

Inheriting from armada-xp.dtsi is fine, but if you manually set
"marvell,mv64xxx-i2c", that will override the old setting
and drop the "marvell,mv78230-i2c" part, which is bad because
it may break things later if it turns out that the mv78230
variant is not completely compatible with the old
mv64xxx variant.

	Arnd
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