[U-Boot] [PATCH V2] Adds driver for Xilinx' xps_spi SPI controller.

[Marek Vasut <marek.vasut@gmail.com>]

Dear Graeme Smecher,

> Hi Marek,
> 
> On 31/03/12 12:42 PM, Marek Vasut wrote:
> > Dear Graeme Smecher,
> > 
> >> Hi Wolfgang,
> >> 
> >> On 18/09/10 01:02 PM, Wolfgang Denk wrote:
> >>> Dear Graeme Smecher,
> >>> 
> >>> In
> >>> message<1280955847-2999-1-git-send-email-graeme.smecher@mail.mcgill.ca
> >>> >
> > 
> > you wrote:
> >>>> This code differs in only trivial ways from the altera_spi driver. It
> >>>> plays nice with Thomas Chou's mmc_spi driver, as well as with SPI
> >>>> flash.
> >>> 
> >>> Hm... if the core really differs in only trivial ways from the
> >>> altera_spi driver, then why do we need a duplication of that code?
> >>> 
> >>> Can we plase have a single driver source that supports both instead?
> >> 
> >> Hm... It's possible to combine xilinx_spi.c and altera_spi.c. However, I
> >> suspect joining them will make maintenance more complicated rather than
> >> simpler. I can't, for example, test a combined driver on Altera hardware
> >> (and the Altera maintainer will likely have the same problem with Xilinx
> >> hardware.)
> >> 
> >> My guess is that most SPI interfaces are nearly identical at a register
> >> level, especially for drivers that don't support interrupts and other
> >> complications. (See mxc_spi.c for another example.) Xilinx and Altera's
> >> SPI interfaces are just two examples that happen to both be FPGA-based
> >> -- I could probably have adapted any of the other SPI drivers instead.
> >> 
> >> Are you sure combining drivers is the most logical approach? Let me
> >> know, and I'll have a crack at it.
> >> 
> >> thanks,
> >> Graeme
> > 
> > What was the conclusion here? Shall I drop the patch or will you submit a
> > rebased version?
> 
> Please drop the patch for now, since I'm not in a position to maintain
> it. The trail of bread-crumbs on the mailing list is a good compromise
> until someone (me, later on?) steps up.

Sorry to hear that, though thanks for updating me on the situation :)

> thanks,
> Graeme

Best regards,
Marek Vasut