[U-Boot] [PATCH V2] Adds driver for Xilinx' xps_spi SPI controller.
Graeme Smecher
graeme.smecher at mail.mcgill.ca
Mon Sep 20 16:43:32 CEST 2010
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 at 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
More information about the U-Boot
mailing list