Re: R: R: [PATCH net] net: dsa: mv88e6xxx: continue without PTP if the TAI period is invalid

On Sun, Sep 20, 2026 at 07:08:57PM +0000, Nicolò Giuliani - nicolo.giuliani6@studio.unibo.it wrote:

Hi Andrew,

Thanks, that is what I needed. I checked it on the board (chip ID
0x1930, so the driver entry is the 88E6193X, family 6393, which uses
mv88e6390_avb_ops and mv88e6352_ptp_ops):

Marvell names all there devices 88e6xyz. The x indicates the model
within the family y. The lower the value of x, the less features the
device has.

So i could well be the 88E6193X does not have avb, tsn and ptp.

Marvell has a vendor driver for these devices called UMSD. It has an
open source licence, but it is well hidden.

include/driver/msdSysConfig.h:	MSD_88E6193X = 0x193,   /* 88E6193X  - BGA package - No AVB, No Routing, No Cut-through*/

So i would say PTP is not available on this device. Please could you
submit a patch removing the mv88e6390_avb_ops and mv88e6352_ptp_ops.

There is also:

        MSD_88E6191X = 0x192,  /* Amethyst 88E6191X  - BGA package - No AVB, No Routing, No Cut-through, No TCAM, No 802.1BR*/

Maybe you can review that entry as well.

       Andrew