Re: [PATCH] arm64: ls1046ardb: Replace XGMII with 10GBASE-R phy mode

[Vladimir Oltean]

On Tue, Feb 20, 2024 at 02:12:52PM -0500, Sean Anderson wrote:
> On 2/20/24 09:50, Vladimir Oltean wrote:
> > Notice that unlike fm1-mac10 (node "ethernet@f2000"), there is no
> > pcs-handle-names property (fm1-mac10 has it defined in fsl-ls1046-post.dtsi,
> > whereas fm1-mac9 doesn't. Don't ask me why, I don't know....)
> 
> I think this is just because this ethernet is always XFI and never (Q)SGMII.

Is that so? With SerDes protocol 0x3333, won't the PCS that's connected
to fm1-mac9 use SGMII/1000BASE-X (thus not 10GBASE-R)?

And as for QSGMII, what's the relevance of that? You can't have one
device tree good for all SerDes protocols and RCW pinmuxing options.
Either there are 4 MACs aggregated onto a single lane, or there is one
MAC per lane, but I've never encountered any use case for alternating
between these 2 configurations at runtime, or with same device tree for
that matter, have you? QSGMII seems to have been the original motivation
for listing all possible PCSes of a MAC in pcs-handle-names, but again, why?

> Can you please submit this patch? I noticed this but never had the chance to go
> back and debug it.

https://lore.kernel.org/netdev/20240220223442.1275946-1-vladimir.oltean@xxxxxxx/