netdev - Re: [net-next PATCH 1/1] drivers: net: cpsw: Add support for new CPSW IP version

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Date:	Wed, 31 Jul 2013 18:28:27 +0300
From:	Felipe Balbi <balbi@...com>
To:	Richard Cochran <richardcochran@...il.com>
CC:	Mugunthan V N <mugunthanvnm@...com>, <netdev@...r.kernel.org>,
	<davem@...emloft.net>, <linux-omap@...r.kernel.org>, <balbi@...com>
Subject: Re: [net-next PATCH 1/1] drivers: net: cpsw: Add support for new
 CPSW IP version

On Wed, Jul 31, 2013 at 04:49:59PM +0200, Richard Cochran wrote:
> On Wed, Jul 31, 2013 at 05:42:26PM +0530, Mugunthan V N wrote:
> > The new IP version has a minor changes and the offsets are same as the previous
> > version, so instead of adding CPSW version number in the driver, make the driver
> > to fall through to the latest versions so that the new version of CPSW which has
> > the same register offsets will work directly without patching the driver.
> 
> This doesn't make any sense to me. Why not just add the new version
> number?
> 
> None of the hunks in your patch are on performance sensitive paths, so
> I really can't see any point in removing the error checking.

well, if a new revision of the IP comes, the driver at least has some
chance to work without having to be modified. If it turns out that there
are really different features, then we patch a new version, otherwise we
should just assume highest known version and try it out.

-- 
balbi

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