linux-kernel - Re: [PATCH v3 00/13] sunxi spi fixes

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Message-ID: <20160725073204.GD7419@lukather>
Date:	Mon, 25 Jul 2016 09:32:04 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>, stable@...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>,
	Chen-Yu Tsai <wens@...e.org>,
	Russell King <linux@...linux.org.uk>,
	Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Olof Johansson <olof@...om.net>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Simon Horman <horms+renesas@...ge.net.au>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Thierry Reding <treding@...dia.com>,
	Alison Wang <b18965@...escale.com>,
	Timo Sigurdsson <public_timo.s@...entcreek.de>,
	Jonathan Liu <net147@...il.com>,
	Gerhard Bertelsmann <info@...hard-bertelsmann.de>,
	Priit Laes <plaes@...es.org>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v3 00/13] sunxi spi fixes

On Fri, Jun 17, 2016 at 12:34:44PM +0200, Michal Suchanek wrote:
> Hello,
> 
> On 13 June 2016 at 21:57, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > On Mon, Jun 13, 2016 at 05:46:48PM -0000, Michal Suchanek wrote:
> >> Hello,
> >>
> >> This is update of the sunxi spi patches that should give full-featured SPI
> >> driver.
> >>
> >> First three patches fix issues with the current driver and can be of use for
> >> stable kernels so adding cc for those.
> >>
> >> I merged the sun4i and sun6i driver because there several issues that need to
> >> be fixed in both separately and they are even out of sync wrt some fixes.
> >> I guess some of the merge patches can be squashed.
> >>
> >> I tested this with A10s Olinuxino Micro. I have no sun6i device so I cannot
> >> tell if that side was broken by this patchset - especially the last patch that
> >> adds DMA was afaik never tested on sun6i.
> >
> >
> > For the record, I'm still very much opposed to such a merge.
> 
> What is the reason against the merge? I did not find the original
> discussion.

I really prefer some code that is concise and clear but a little
duplicated over some code that shares every possible lines of code but
is a giant mess impossible to understand.

I just came across the reg_field stuff in regmap that would allow to
partially address that problem though, there's still the bit indices
issue to overcome though.

> I tried to rename everything in the drivers from sun4i and sun6i to
> sunxi to look at a clean diff and found about 5 differences 2 of which
> look like a bug.

It's hard to tell without testing.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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