[PATCH 3/3] libertas: if_spi, driver for libertas GSPI devices

Angel Roman angel.roman at mdesystems.com
Tue Dec 16 13:05:57 EST 2008

Dan Williams wrote:
> On Mon, 2008-12-15 at 22:44 -0500, Angel Roman wrote:
>> Hi Colin,
>> I have support for the gspi as well. I've been trying to get in contact
>> with Dan Williams in order to contribute it to the list.
> Sorry about that... it's in my queue and I'll try to get to do some
> review in the next few days. Doing the new interface isn't a ton of
> code, and I'd expect both yours and Colin's drivers to be quite similar
> as there's only a few ways this thing can be done :)
> The submission process is basically just like Colin did; generate a
> series of patches of your latest code (split into independent patches if
> possible) based on a kernel version (ideally the latest kernel version
> or better yet, wireless-testing.git) and then post it to linux-wireless
> and maybe cc libertas-dev as well.
Thanks, will do. I look forward to combining our efforts.
>> If you want, you can take a look at the code via:
>> svn list -R
>> svn://svn.buglabs.net/bug/trunk/bug-linux- 
>> This is currently working in the mx31 processor. Maybe we can work out a
>> way to merge the two drivers. The mx31 was a little tricky since there's
>> an error in the processor where one is not able to keep the chip select
>> signal active during multiple spi transfers as requried by the wifi
>> module. I've also abstracted the board interface from the GSPI code as
>> much as I could.
> Is there a generic SPI layer that could be used for the board-specific
> bits too, rather than putting that stuff in the libertas tree? I assume
> that the SPI bus is more or less generic on your hardware (ie you could
> put something else on the other end instead of the 8686), and thus it
> would be better if we could figure out way not to put some much board
> specific logic into the libertas driver itself.
Yes, the spi libertas core driver in buglabs' tree does not depend on 
any particular spi implementation. The board specific code - if_bmi.c 
and if_bmi.h - in my code registers a call back function with the gspi 
core which performs the actual  spi transfer. if_bmi.c and if_bmi.h 
could go in another driver and does not need to go into libertas, 
however, the core seems like a good fit for the libertas tree.

> Dan
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