linux-kernel - Re: [PATCH v2 3/6] GPIO: xilinx: Use __raw_readl/__raw

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Message-ID: <CACRpkdbHviP-n_Azso+WcqYeoENNtYjKVbWMp5nbeMt310_LGQ@mail.gmail.com>
Date:	Mon, 17 Jun 2013 07:46:50 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Simek <monstr@...str.eu>, Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH v2 3/6] GPIO: xilinx: Use __raw_readl/__raw_writel IO functions

On Mon, Jun 3, 2013 at 2:31 PM, Michal Simek <michal.simek@...inx.com> wrote:

> This driver can be used on Xilinx ARM Zynq platform
> where in_be32/out_be32 functions are not implemented.
> Use __raw_readl/__raw_writel functions which are
> implemented on Microblaze and PowerPC.
> For ARM readl/writel functions are used instead.
>
> The correct way how to implement this is to detect
> endians directly on IP. But for the gpio case
> without interrupt connected(it means without
> interrupt logic) there are just 2 registers
> data and tristate where auto detection can't be done.
>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> Changes in v2:
> - New patch in this series
>
> I have chosen to use readl/writel for ARM because
> of barriers and keep __raw versions for microblaze
> and ppc where this is not a problem.
> The reason why in_be32/out_be32 can't be used
> is that it won't work on Microblaze LE when
> I fix Microblaze IO function implementation which
> is broken right now.

Makes perfect sense.

Patch applied.

Yours,
Linus Walleij
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