linux-kernel - Re: [RFC PATCH 0/4] Describe SPI devices in the OF device tree and add mpc5200-spi driver

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Message-ID: <9e4733910805161425i2d6cc034y3377af053a4198b5@mail.gmail.com>
Date:	Fri, 16 May 2008 17:25:28 -0400
From:	"Jon Smirl" <jonsmirl@...il.com>
To:	"Grant Likely" <grant.likely@...retlab.ca>
Cc:	linuxppc-dev@...abs.org, spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, dbrownell@...rs.sourceforge.net,
	fabrizio.garetto@...il.com
Subject: Re: [RFC PATCH 0/4] Describe SPI devices in the OF device tree and add mpc5200-spi driver

On 5/16/08, Grant Likely <grant.likely@...retlab.ca> wrote:
> On Fri, May 16, 2008 at 2:27 PM, Jon Smirl <jonsmirl@...il.com> wrote:
>  > On 5/16/08, Grant Likely <grant.likely@...retlab.ca> wrote:
>  >> This series is a set of changes to allow the slaves on an SPI bus to be
>  >>  described in the OF device tree (useful in arch/powerpc) and adds a driver
>  >>  that uses it (the Freescale MPC5200 SoC's SPI device).
>  >
>  > Right now we have SPI hooked up to PSC3. Hardware engineer is gone but
>  > I'll see if I can get him to alter things to use the SPI controller. I
>  > have an old mail from him where he thinks the Phytec board is missing
>  > a signal needed to use the SPI controller.
>
>
> While I'd appreciate the testing, I suspect that you really don't want
>  to do that.  The dedicated SPI controller isn't very good.  It only
>  does a byte at a time and so is rather slow.  A PSC is SPI mode should
>  be better (but I haven't tried it personally it yet).

What is the device tree node for PSC3 supposed to look like when it
has both serial and spi enabled?

-- 
Jon Smirl
jonsmirl@...il.com
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