linux-kernel - Re: [PATCH V14 3/4] ptp: Added a clock driver for the IXP46x.

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Message-Id: <201104181021.01279.arnd@arndb.de>
Date:	Mon, 18 Apr 2011 10:21:01 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Lameter <cl@...ux.com>,
	David Miller <davem@...emloft.net>,
	John Stultz <john.stultz@...aro.org>,
	Krzysztof Halasa <khc@...waw.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Rodolfo Giometti <giometti@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Mike Frysinger <vapier@...too.org>,
	Paul Mackerras <paulus@...ba.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH V14 3/4] ptp: Added a clock driver for the IXP46x.

On Monday 18 April 2011, Richard Cochran wrote:
> On Mon, Apr 18, 2011 at 08:56:03AM +0200, Arnd Bergmann wrote:
> > On Monday 18 April 2011, Richard Cochran wrote:
> > > +
> > > +       lo = __raw_readl(&regs->channel[ch].src_uuid_lo);
> > > +       hi = __raw_readl(&regs->channel[ch].src_uuid_hi);
> > > +
> > 
> > I guess you should use readl(), not __raw_readl() here. The __raw_* functions
> > are not meant for device drivers.
> 
> Krzysztof had a different opinion about this.
> 
>     https://lkml.org/lkml/2011/1/8/67
> 
> Anyway, it is his driver, and I just followed what he does elsewhere
> in the driver. It make sense to me to keep the driver consistent.
> Maybe we should make the change throughout?

It would certainly be useful to fix it up. I now realized that this driver
supports both big-endian and little-endian configurations, so just using
readl() is certainly broken.
There should probably be an ixp specific version of the safe I/O accessors
to deal with it on all on-chip peripherals in a safe way.

	Arnd
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