Marcel Holtmann wrote:

Hi Sjur,

quoted

This patch-set introduces the CAIF protocol Stack.

The "Communication CPU to Application CPU Interface" (CAIF) is a
packet based connection-oriented MUX protocol developed by
ST-Ericsson for use with its modems. 

* CAIF provides a socket interface which can be used to open virtual
  AT channels, create and configure GPRS Data connections.

* A CAIF Network device is also provided for GPRS access.
  This interface can be managed with socket IOCTLs or RTNL.

* A kernel interface is provided allowing Kernel modules to use CAIF.

* A serial link layer layer implemented as a line discipline is
  currently implemented. Other link interfaces may be contributed at
a later stage. 

any details on potential USB, SPI or SDIO drivers?

We have a SPI driver that we could contribute, 
but I think it might need some more work before submitting it.
Also I think it would be good to have this patch set accepted before we
start on SPI.

BR/Sjur