linux-kernel - Re: [PATCH] clk: Add axi-clkgen driver

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Message-ID: <50FFC02C.9000109@metafoo.de>
Date:	Wed, 23 Jan 2013 11:49:16 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: Add axi-clkgen driver

On 01/23/2013 11:27 AM, Russell King - ARM Linux wrote:
> On Wed, Jan 23, 2013 at 11:00:56AM +0100, Lars-Peter Clausen wrote:
>> I think I read somewhere at some point that ioread{8,16,32} is preferred
>> over write{b,h,l} in new code.
> 
> But... there's *no* point using ioread*() if you don't only use the
> ioremap() interface.
> 
> ioread*() is there to allow PC IO and PC MMIO accesses through one
> accessor depending on the cookie.  ioremap() only ever returns cookies
> for MMIO accesses.

So your point is, if you know that it is MMIO memory only ever use readl and
friends?

- Lars
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