linux-kernel - Re: [PATCH 0/2] crypto: add new driver for Marvell CESA

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Message-ID: <20150409151846.GE1459@lunn.ch>
Date:	Thu, 9 Apr 2015 17:18:46 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	Tawfik Bayouk <tawfik@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Thomas Petazzoni <info@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Arnaud Ebalard <arno@...isbad.org>
Subject: Re: [PATCH 0/2] crypto: add new driver for Marvell CESA

On Thu, Apr 09, 2015 at 04:58:41PM +0200, Boris Brezillon wrote:
> Hello,
> 
> This is an attempt to replace the mv_cesa driver by a new one to address
> some limitations of the existing driver.
> >From a performance and CPU load point of view the most important
> limitation is the lack of DMA support, thus preventing us from chaining
> crypto operations.
> 
> I know we usually try to adapt existing drivers instead of replacing them
> by new ones, but after trying to refactor the mv_cesa driver I realized it
> would take longer than writing an new one from scratch.

Hi Boris

What is the situation with backwards compatibility? I see you have
kept the old compatibility string, and added lots of new ones, and
deprecated some properties. Will an old DT blob still work?
 
 Thanks
	Andrew
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