Re: [PATCH net-next v6 1/9] net: dsa: microchip: Add support for KSZ8463 global irq

[Vladimir Oltean <olteanv@gmail.com>]

On Thu, Mar 12, 2026 at 12:14:40AM +0000, Tristram.Ha@microchip.com wrote:
> I just tried the ks8995 driver and I do not think it is ready to do major
> DSA operation.  Actually I could not make it work if I registered it as a
> DSA switch.  DSA could not register the switch PHY.  If I removed the port
> information in the device tree there was no error message but still the
> MAC could not send out anything.  If I skipped the registration at least
> the MAC can communicate.
> 
> The driver is using DSA_TAG_PROTO_NONE so there is no tagging involved.
> But then I do not know how to define the device tree for the DSA to change
> the STP state of each port to allow communication.
> 
> The primary purpose of this driver in the old time was to enable the
> switch as the hardware default is disabled.
> 
> Even though KSZ8795 was added to this driver its register set is not a
> complete match to KSZ8895.  So some functions may not work correctly like
> the change_mtu one.  And I do not think KSZ8463/KSZ8863 can work at all.
> 
> Since we have a working KSZ8463 PTP driver we should stick with the
> Microchip KSZ DSA model and work from there.
> 
> Out of topic I found that the NAND driver is not started in the new 7.0
> kernel while 6.19 is still okay.  I do not think there is a major overhaul
> in that area, and the Atmel NAND driver code is about the same.  I thought
> the device name may be changed so the right driver is not picked up, but
> using the device tree in the 7.0 kernel still does not work.

Thanks for the comment. I took a deeper look at the ksz_switch common
driver and I've started working on some patches. I'll return when
they're more or less ready.