Re: [PATCH net-next v3 0/2] net: dsa: mxl-gsw1xx: reset the switch through reset-gpios

[Joseph Telaak]

On Fri, Nov 13, 2026 at 05:16:51PM -0500, Joseph Telaak wrote:
> I'm testing the other way now, with the PHYs described at 1 to 3 and no
> reset from Linux. If that works on warm and cold boots, this series
> isn't needed and I'll drop it.

It doesn't work. With the PHYs described at 1 to 3 and no reset from
Linux, neither LAN port passes traffic, after the flash or after a cold
power-on. The same board with this series works.

So the addresses aren't the whole story: U-Boot leaves the switch in
some other state that the DT can't describe, and the reset clears it.
On your earlier question, the driver already writes PHY_ADDR from the
DT, in gswip_port_enable(), but only once the PHYs have been probed.

Since GL's own firmware resets the switch from Linux too, I still think
a hardware reset at probe is the right fix. I'll send a v4 with the
cover letter corrected, this explained, and Sashiko's points addressed
(the silent skip with CONFIG_RESET_GPIO=n, and the repeated pulse on
probe deferral).