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

[Graeme Smecher <gsmecher@threespeedlogic.com>]

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.

thanks,
Graeme