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

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Date:	Mon, 28 Jul 2014 13:17:56 +0200
From:	Benoit Masson <benoitm@...enite.com>
To:	Arnd Bergmann <arnd@...db.de>
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


Le 28 juil. 2014 à 13:02, Arnd Bergmann <arnd@...db.de> a écrit :

> 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.

Ok then does this mean I can simply remove the "compatible" line to only inherits from armada-xp-dtsi ?

"i2c@...00 {
                                clock-frequency = <400000>;
                                status = "okay";
"

Would this be enough ?

Benoit
> 
> 	Arnd

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