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

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Date:	Thu, 24 Jul 2014 14:21:03 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Jason Cooper <jason@...edaemon.net>,
	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,
	Sebastian Hesselbarth <sebastian.hesselbarth@...glemail.com>
Subject: Re: [PATCH 2/2] ARM: mvebu: Added dts defintion for Lenovo Iomega
 ix4-300d NAS

On 24/07/2014 01:15, Jason Cooper wrote:
> On Thu, Jul 24, 2014 at 01:11:12AM +0200, Benoit Masson wrote:
>> Le 24 juil. 2014 à 00:58, Andrew Lunn <andrew@...n.ch> a écrit :
>>
>>>> For the marvell,mv78230-a0-i2c unfortunately i've spend 3 hours
>>>> trying to understand this but it only works with this on the
>>>> ix4-300d :(. There was multiple patch around this and maybe one
>>>> broke the auto-detect part of this, I've tried compiling with some
>>>> 3.10 or lower kernel but no luck here I still have to put this a0
>>>> option.
>>>
>>> Lets first confirm you have an a0 SoC.
>>>
>>> At boot time, it should print:
>>>
>>> pr_info("MVEBU SoC ID=0x%X, Rev=0x%X\n", soc_dev_id, soc_rev);
>>>
>>> What revision do you have?
>>>
>>> If the auto detect code really is broken, Gregory will likely take a
>>> look.
>>
>> I sure do,
>>
>> confirmed by u-boot  output below:
>>
>> U-Boot 2009.08 (Mar 04 2013 - 11:13:04) Marvell version:  2.3.2 PQ
>> U-Boot Addressing:
>>        Code:..00600000:006BFFF0
>>        BSS:..00708EC0
>>        Stack:..0x5fff70
>>        PageTable:.0x8e0000
>>        Heap address:.0x900000:0xe00000
>> Board: DB-78230-BP rev 2.0 Wistron
>> SoC:   MV78230 A0
>>
>> From kernel I get:
>>
>> mvebu-soc-id: MVEBU SoC ID=0x7823, Rev=0x1
> 
> Well, isn't that a peach?  :)  Gregory?

A peach?? For me it is either a fruit or a princess, so I am puzzled!

Well about the issue, we patch the device tree for the i2c quirk only for
the openblock AX3. 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. 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.

Gregory


> 
> thx,
> 
> Jason.
> 


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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