linux-kernel - Re: [PATCH 01/22] mfd/ti_am335x

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Message-ID: <20130611142336.GE29135@zurbaran>
Date:	Tue, 11 Jun 2013 16:23:36 +0200
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Benoît Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jonathan Cameron <jic23@....ac.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Felipe Balbi <balbi@...com>, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH 01/22] mfd/ti_am335x_tscadc: remove regmap

Hi Sebastian,

On Tue, Jun 11, 2013 at 01:30:47PM +0200, Sebastian Andrzej Siewior wrote:
> The MFD part uses regmap without caching and is the only user of the
> regmap. The child drivers, that is input(touch) and iio(adc), use direct
> reg access.
> There is a patch which converts them to use regmap as well but I see no
> benefit at all doing this. There is a direct MMIO bus access with no
> need to cache values like for I2C or SPI devices. Furthermore, most (if
> not all) of the access done by the touch & ADC driver read volatile
> register.
> Therefore this patch removes regmap part of the driver.
NAK. Using regmap is better than open coding your register accesses, and
the children not using this API is not a reason for the MFD driver to do
the same.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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