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

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Date:	Fri, 23 Aug 2013 12:56:40 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Daniel Mack <zonque@...il.com>
CC:	<netdev@...r.kernel.org>, <bcousson@...libre.com>,
	<nsekhar@...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 Friday 23 August 2013 12:30 PM, Daniel Mack wrote:
> On 23.08.2013 16:23, Santosh Shilimkar wrote:
>> On Friday 23 August 2013 10:16 AM, Daniel Mack wrote:
> 
>>> +static const struct of_device_id cpsw_of_mtable[] = {
>>> +	{
>>> +		.compatible	= "ti,am3352-cpsw",
>>
>> I didn't notice this earlier, but can't you use the IP version
>> as a compatible instead of using a SOC name. Whats really SOC specific
>> on this IP ? Sorry i have missed any earlier discussion on this but
>> this approach doesn't seem good. Its like adding SOC checks in the
>> driver subsystem.
> 
> As I already mentioned in the cover letter and in the commit message, I
> just don't know which criteria makes most sense here.
> 
> On a general note, I would say that chances that this exactly IP core
> with the same version number will appear on some other silicon which
> doesn't support the control mode register in an AM33xx fashion, is not
> necessarily negligible.
> 
> So what that new compatible string denotes is the cpsw in a version as
> found on am3352 SoCs, which is actually exactly what it does.
> 
> I don't have a strong opinion here, but see your point. I just don't
> have a better idea on how to treat that.
> 
So just stick the IP version or call it cpsw-v1... cpsw-v2 etc.
That way if in future if someone uses those features, they can use
this compatible if they don't they use the one which suites that
SOC.

Regards,
Santosh

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