netdev - Re: [PATCH v4 3/5] net: ethernet: cpsw: introduce ti,am3352-cpsw compatible string

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Message-ID: <52179AD6.8090406@gmail.com>
Date:	Fri, 23 Aug 2013 19:24:38 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
CC:	Sekhar Nori <nsekhar@...com>, netdev@...r.kernel.org,
	bcousson@...libre.com, sergei.shtylyov@...entembedded.com,
	davem@...emloft.net, ujhelyi.m@...il.com, mugunthanvnm@...com,
	vaibhav.bedia@...com, d-gerlach@...com,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/5] net: ethernet: cpsw: introduce ti,am3352-cpsw
 compatible string

On 23.08.2013 19:19, Santosh Shilimkar wrote:
> On Friday 23 August 2013 01:09 PM, Sekhar Nori wrote:
>> On 8/23/2013 10:26 PM, Santosh Shilimkar wrote:

>>> So just stick the IP version or call it cpsw-v1... cpsw-v2 etc.
>>
>> If this could be handled using IP version then the right way would be to
>> just read the IP version from hardware and use it. No need of DT property.
>>
> Thats fine as well but I thought the patch needed additional properties like
> CM reg-address come from DT and hence the separate compatible. If you can
> manage without that, thats even better.

We can't, that's the whole point :)

Well, theoretically, we could for now, but that's not a clean solution.
Again: the problem here is that the control port is separated from the
cpsw core, and so we have to implement something specific for the AM3352
SoC. I know that's a violation of clean and generic driver ideas, but
there's no way we can assume that every cpsw v2 ip block has a control
port that is compatible to the one found on am335x chips.


Daniel
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