Re: [PATCH RFC net-next 2/3] net: dsa: mxl862xx: add SMDIO clause-22 register access

On Wed, Jul 08, 2026 at 09:45:48PM +0200, Daniel Golle wrote:

On Wed, Jul 08, 2026 at 07:22:49PM +0200, Andrew Lunn wrote:

quoted

On Tue, Jul 07, 2026 at 04:16:07PM +0200, Daniel Golle wrote:

quoted

Add mxl862xx_smdio_read() and mxl862xx_smdio_write() for clause-22
SMDIO register access. MCUboot rescue mode only exposes clause-22
registers; the existing clause-45 MMD interface is unavailable during
firmware transfer. The MDIO bus lock is held per-transaction (not
across polls) so that SB PDI polling during flash erase does not
starve other MDIO users.

What other MDIO users are there? It sounds like once the switch is in
rescue mode, switch management is dead. So how can there be users?

The MDIO bus lock refers to the host bus which is used to connect
the switch management interface. The same bus can also be used to
connect other unrelated PHYs (eg. to provide a WAN or management
interface independent of the switch).

Thanks for the explanation. Maybe 'does not starve other non-switch
MDIO users'?

I've not got to the rest of the patch yet, but i wondered if phylib
might still be trying to poll the switches PHYs.

	Andrew