Hi!

On Wed 2017-08-30 21:32:07, Tristram.Ha@microchip.com wrote:

quoted

On Mon 2017-08-28 16:09:27, Andrew Lunn wrote:

quoted

quoted

I may be confused here, but AFAICT:

1) Yes, it has standard layout when accessed over MDIO.

Section 4.8 of the datasheet says:

	All the registers defined in this section can be also accessed
	via the SPI interface.

Meaning all PHY registers can be access via the SPI interface. So you
should be able to make a standard Linux MDIO bus driver which performs
SPI reads.

As far as I can tell (and their driver confirms) -- yes, all those registers can be
accessed over the SPI, they are just shuffled around... hence MDIO
emulation code. I copied it from their code (see the copyrights) so no, I don't
believe there's nicer solution.

Best regards,

Can you hold on your developing work on KSZ8895 driver?  I am afraid your effort may be in vain.  We at Microchip are planning to release DSA drivers for all KSZ switches, starting at KSZ8795, then KSZ8895, and KSZ8863.

Well, thanks for heads up... but its too late to stop now. I already
have working code, without the advanced features.

I don't know how far away you are with the development. You may want
to start from my driver (but its probably too late now).

The driver files all follow the structures of the current KSZ9477 DSA driver, and the file tag_ksz.c will be updated to handle the tail tag of different chips, which requires including the ksz_priv.h header.  That is required nevertheless to support using the offload_fwd_mark indication.

The KSZ8795 driver will be submitted after Labor Day (9/4) if
testing reveals no problem.  The KSZ8895 driver will be submitted
right after that.  You should have no problem using the driver right
away.

Well, normally world can help with the testing, too. It would be nice
to see the code, as [RFC]. There's great chance that you'll have to
modify the code to adress review feedback, which is why seeing code
soon is useful.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html