Subject: Re: [PATCH net-next 2/2] net: macb: add support for reporting SGMII inband link status

From: "Russell King (Oracle)" <[email-masked]>
Date: Thu, 19 Feb 2026 17:15:46 +0000

On Thu, Feb 19, 2026 at 09:01:12AM -0800, Charles Perry wrote:
> This makes it possible to use in-band autonegotiation with
> SGMII.
> 
> If using a device tree, this can be done by adding the managed =
> "in-band-status" property to the gem node.
> 
> Signed-off-by: Charles Perry <[email-masked]>
...
>     root@p64h:~# ifconfig eth1 up 10.180.59.33
>     macb 40004184000.ethernet eth1: PHY 4000c21e000.mdio-mdio:02 doesn't supply possible interfaces
>     macb 40004184000.ethernet eth1: PHY [4000c21e000.mdio-mdio:02] driver [Microsemi GE VSC8574 SyncE] (irq=POLL)
>     macb 40004184000.ethernet eth1: phy: sgmii setting supported 00000000,00000000,00000000,000042ff advertising 00000000,00000000,00000000,000042ff
>     macb 40004184000.ethernet eth1: configuring for inband/sgmii link mode
>     macb 40004184000.ethernet eth1: major config, requested inband/sgmii
>     macb 40004184000.ethernet eth1: interface sgmii inband modes: pcs=00 phy=03

As your PCS is now configurable, please implement the .pcs_inband_caps
method (which will make the above pcs != 0.)

Thanks.

-- 
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