linux-kernel - Re: [PATCH] spi: spi-fsl-spi: Make spi-fsl-spi usable in cpu mode outside of FSL SOC environments and add a grlib variant normally running on sparc

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Date:	Wed, 30 Jan 2013 11:04:33 +0100
From:	Andreas Larsson <andreas@...sler.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>,
	linux-kernel@...r.kernel.org, Peter Korsgaard <jacmet@...site.dk>,
	spi-devel-general@...ts.sourceforge.net,
	Mingkai Hu <Mingkai.hu@...escale.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	software@...sler.com
Subject: Re: [PATCH] spi: spi-fsl-spi: Make spi-fsl-spi usable in cpu mode
 outside of FSL SOC environments and add a grlib variant normally running
 on sparc

On 2012-12-28 17:16, Andreas Larsson wrote:
> This makes the cpu mode of the driver available outside of an FSL SOC
> and even powerpc environment. This is accomplished by putting things
> regarding fsl specific code and to cpm specific code within ifdefs.
>
> Furthermore, this adds support for the mostly register-compatible
> SPICTRL core from the GRLIB VHDL IP core library normally running on
> sparc. A different entry in of_fsl_spi_match matches this core and
> indicates a different hardware type that is used to set up different
> function pointers and special cases. The fetching of irq is changed to
> work under sparc as well.
>
> The GRLIB core operates in cpu mode and from the driver's point of view
> the important differences are that the number of bits per word might be
> limited and that there might be native chipselects selected via the
> added slvsel register. These differences if present are indicated by an
> added capabilities register.
>
> Signed-off-by: Andreas Larsson <andreas@...sler.com>

Any comments anyone?

This patch takes "Approach A" discussed and supported in 
http://sourceforge.net/mailarchive/message.php?msg_id=30131080

Cheers,
Andreas Larsson

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