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

[Paul Brook]

> > I'm no SPI expert, but a bit of googling suggests that it's
> > a synchronous duplex bus, so you always send a byte of data
> > to the slave and get one back in return (even if for some slaves
> > it might be random garbage).

Waitaminute. So this is just basic synchronous serial?

We already have an API for this. hw/spi.c.

If you're building higer level protocols they should be layered on top of the 
SPI, same as smbus is a protocol layer on top of I2C.

Paul