linux-kernel - Re: [PATCH 4/6] regmap: add MMIO bus support

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Message-ID: <20120405083805.GA3129@opensource.wolfsonmicro.com>
Date:	Thu, 5 Apr 2012 09:38:06 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] regmap: add MMIO bus support

On Wed, Apr 04, 2012 at 05:15:42PM -0600, Stephen Warren wrote:

> I assume the solution here is to:

> * Always use __raw_readl/__raw_writel in regmap-mmio.c so that there's
> never any endianness conversion, and don't use the endianness conversion
> macros when reading/writing the work buffer.
> * Implement alternative formatters that format in LE instead of BE
> * Add a field to regmap_config indicating which endianness the data
> should be in, and use this flag to select the LE/BE formatters.

> Does that sound about right?

Sounds about right, yes - probably worth having a third option for the
formatting which does no translation for on-SoC device.

> > Given that you constrain on registration too this should be BUG_ON(),
> > we're seriously confused if we're specifying a different register size
> > here and -EIO is going to be a bit obscure.

> I wondered about that. I would have been quite happy to repost with that
> change. Do you want an incremental patch?

Yes, please.

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