From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH v3 1/3] asm-generic/io.h: Implement generic
 {read,write}s*()
Date: Tue, 5 Aug 2014 11:14:26 +0200
Message-ID: <20140805091426.GA28220@ravnborg.org>
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To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>, Thierry Reding <thierry.reding@gmail.com>, Russell King <linux@arm.linux.org.uk>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Stephen Boyd <sboyd@codeaurora.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Linux-Arch <linux-arch@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>

> >
> > So xxx_p is for pause (or something like that).
> > This also matches that m68k do some tricks with delay() in the _p variants.
> > Thanks for the explanation.
> 
> m68k's isa_delay() uses the same approach as x86's slow_down_io(),
> but only for Q40/Q60, which has a "real" ISA bus that accepts legacy
> ISA expansion cards (http://www.q40.de/).
Based on the nice description from James I have on my todo list
to cook up a patch to io.h to document this.
Had just not got around to do it yet.

	Sam