linux-kernel - Re: [RFC PATCH 1/5] spi: introduce flag for memory mapped read

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Date:	Fri, 31 Jul 2015 19:17:45 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Vignesh R <vigneshr@...com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Huang Shijie <b32955@...escale.com>,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] spi: introduce flag for memory mapped read

On Tue, Jul 28, 2015 at 02:11:12PM +0530, Vignesh R wrote:

> Introduce use_mmap_read field in spi_message struct. This can be set by
> mtd devices (m25p80) to indicate to spi-master (ti-qspi) to perform
> memory mapped read. This helps to distinguish whether the spi-message is
> from mtd layer(hence mmap read is possible) or by other spi devices.

Based on this description and...

> + * @use_mmap_mode: Indicate to spi master to perform memory mapped
> + *	read if possible.

...the internal documentation I unable to tell what is meant by "perform
a memory mapped read", at least to the extent where it is visible
outside of the driver.  This means we can't really use this as a generic
API since other people won't be able to tell what it does.

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