FPGA registers userspace interface?

[greg@kroah.com (Greg KH)]

On Mon, Jan 03, 2011 at 10:52:34PM +0200, Daniel Baluta wrote:
> > I thought about using 3 files in sysfs.
> > 1. address of the register
> > 2. data to write to the register
> > 3. trigger that do the write
> 
> The most effective solution would be to
> have one file per register.
> 
> Writing register:
> # echo value > /sys/path/to/file
> 
> Reading register:
> # cat /sys/path/to/file
> 
> Also, since your FPGA is in development phase I assume that
> the registers base address is changing (or am I wrong?). You can
> solve this with an additional writable sysfs entry  which will
> hold the current base address.

Also remember that debugfs would also be good for something like this,
being much easier to use than sysfs.

Note the rule when using debugfs:
	There is are no rules when using debugfs.

Which works much better when doing development :)

thanks,

greg k-h