On Sunday 05 July 2009, Hemanth V wrote:
> Do you see any major changes required to support
> slave mode in the SPI core driver.
There *is* no such thing as a "SPI core driver"...
> We are able to
> use the existing interface for slave mode also, but
> some APIs/ Structures could be made generic.
Three things are obvious:
- A spi_master is not a slave side driver!
- Control model would need to be inverted
* Chip select would be one input,
not N outputs
* No clock rate controls at all
* latency issues ... driver can't necessarily
respond quickly enough to guarantee no data
loss (FIFOs help)
* Can't re-use /dev/spidev*
* Request queue would have a very different role
- Some primitives are likely missing, for flow
control (when hardware has a READY handshake)
I think a few proposals for how to handle slave
side have been circulated.
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