Re: Linux SPI slave support

[Marek Vasut <marex-ynQEQJNshbs@public.gmane.org>]

Dear Shubhrajyoti Datta,

> Hello,
> 
> On Sat, Jun 30, 2012 at 8:45 AM, Marek Vasut <marex-ynQEQJNshbs@public.gmane.org> wrote:
> > Hello,
> > 
> > is there currently any ongoing effort to support SPI slave mode in Linux?
> > 
> > If there is none, could you please share any hints that might help me
> > better choose and go in the direction of implementing the SPI slave
> > support?
> 
> May be you may want to check the archives.
> You may want to see below before designing.
> 
> http://permalink.gmane.org/gmane.linux.kernel.spi.devel/7495
[...]

So, idea V2:

1) Separate out common parts from struct spi_master
2) Create struct spi_slave
2a) Implement spi_slave_send_message for spi_slave
2b) Implement <?> netlink interface to push and pull messages to/from userland ?

The protocol won't be done in kernel, but completely in userland.

Is this good approach to take? Or maybe 2b can be replaced by blocking read on 
character device? I think netlink interface might actually be suited quite well 
for this task.

Best regards,
Marek Vasut

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