Adding support for new Ethernet PHY

[Jonathan Brandmeyer]

I ran into some device tree support for this phy in
sys/gnu/dts/include/dt-bindings/net/ti-dp83867.h  It looks like
configuration information that would be fed to the generic mii_fdt
driver somehow.

Thanks for the tip re: ukphy.  What exactly does "basic support
without any extras" entail?  The test environment uses standard
gigabit workgroup switches.  So as long as it comes up in a
full-duplex gigabit mode, we're happy.

On Mon, Jun 17, 2019 at 12:09 PM Christian Mauderer <list at c-mauderer.de> wrote:
>
> On 17/06/2019 18:16, Jonathan Brandmeyer wrote:
> > What does it take to support a new Ethernet PHY in rtems-libbsd?  We've
> > got a board with a TI DP83867 family member on it, which appears to have
> > some support in FreeBSD.  How can that get pulled into a particular
> > rtems-libbsd BSP?
> >
> > Thanks,
> > -Jonathan Brandmeyer
> >
>
> Hello Jonathan,
>
> if there is already a PHY driver for that PHY, you basically just follow
> the steps from "How to Import Code from FreeBSD" in the libbsd
> CONTRIBUTING.md. PHYs should be quite simple so it would be about:
>
> - Add the files to libbsd.py
> - Run ./freebsd-to-rtems.py -R and ./freebsd-to-rtems.py
> - Commit the _unchanged_ imported files.
> - Commit libbsd.py and (if necessary) changes.
> - Add the driver reference to nexus-devices (if it is a officially
> supported BSP) or to your application.
>
> If it is supported, it should be most likely one of the files in
> freebsd-org/sys/dev/mii. But to be honest: I didn't find it on a quick
> look. Where did you find the support?
>
> On the other hand: The DP83867E seems to have the default registers. If
> you only need basic support without any extras, the generic ukphy (short
> for UnKnown PHY) driver should work.
>
> Best regards
>
> Christian Mauderer



-- 
Jonathan Brandmeyer