Re: [PATCH net-next v3] net: dsa: microchip: enable the SGMII port of the KSZ9897S

[Tapio Reijonen]

On 8/31/26 08:10, Tapio Reijonen wrote:
> The variants do differ in the read-only bit 7 of the port 7 XMII control
> 0 register, which reads one on the KSZ9897S and zero on the KSZ9897R.

Microchip support have now confirmed this with their internal team:
register 0x7300 reads 0xF8 on the KSZ9897S and 0x78 on the KSZ9897R.
The two values differ in bit 7 only, which is the bit this patch tests.

That closes the one gap in my testing. I have no KSZ9897R sample, so the
"this does not break the R" half was reasoned from the two data sheets
and the driver code; it is now confirmed by the vendor.

Tapio