Re: [Qemu-devel] [RFC PATCH v1 1/4] SPI: initial support

[Peter Crosthwaite]

Hi Peter,

One major flaw in that interface (which is similar to another that we
originally used) is it doesnt have an API for wiggling the CS lines.
Some spi devices (e.g. the m25p80 in this series) have side effects
from cs strobing whether or not a txrx occurs during cs assertion,
which is not possible in that api. Thats the main difference between
the two implementations.

Regards,
Peter


On Fri, Mar 30, 2012 at 5:37 PM, Peter Maydell <address@hidden> wrote:
> On 30 March 2012 07:37, Peter A. G. Crosthwaite
> <address@hidden> wrote:
>> defined spi bus and spi slave QOM interfaces. Inspired by and loosley based 
>> on
>> existing I2C framework.
>
> There's also SPI support in qemu-linaro thanks to the folks at Nokia:
> http://git.linaro.org/gitweb?p=qemu/qemu-linaro.git;a=blob;f=hw/spi.h
>
> I guess we need to look at both and figure out which is the better
> implementation...
>
> -- PMM