linux-kernel - Re: [PATCH 1/2] spi: spi-omap2-mcspi.c: Add dts for slave device configuration.

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Date:	Thu, 6 Jun 2013 11:19:19 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Illia Smyrnov <x0194613@...com>
Cc:	Illia Smyrnov <illia.smyrnov@...com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>, Daniel Mack <zonque@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 1/2] spi: spi-omap2-mcspi.c: Add dts for slave device
 configuration.

On Thu, Jun 06, 2013 at 01:08:46PM +0300, Illia Smyrnov wrote:
> On 06/05/2013 02:57 PM, Mark Brown wrote:

> Turbo mode gives the expected results not for all cases. There are
> some limitations:
> - works only if a single channel is enabled (no effect when several
> channels are enable);
> - improves the throughput on RX direction only;
> - effective only when a transfer exceeds two words. For single SPI
> word transfers OMAP TRM [1] recommends deactivate turbo mode.

> So it is useful to have the property in DT, that allow us to switch
> turbo mode off/on for certain slave.

Why?  These sound like conditions that can readily be detected at
runtime.

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