Re: [PATCH v6 3/6] net: phy: at803x: add QCA8084 ethernet phy support

Andrew Lunn
2023-11-26T17:31:24Z

> + /* There are two PCSs available for QCA8084, which support the
> + * following interface modes.
> + *
> + * 1. PHY_INTERFACE_MODE_10G_QXGMII utilizes PCS1 for all
> + * available 4 ports, which is for all link speeds.
> + *
> + * 2. PHY_INTERFACE_MODE_2500BASEX utilizes PCS0 for the
> + * fourth port, which is only for the link speed 2500M same
> + * as QCA8081.
> + *
> + * 3. PHY_INTERFACE_MODE_SGMII utilizes PCS0 for the fourth
> + * port, which is for the link speed 10M, 100M and 1000M same
> + * as QCA8081.
> + */

How are these 3 modes configured? I don't see any software
configuration of this in these drivers. Can it only by configured by
strapping?

I think there should be some validation of the phydev->interface
mode. Are ports 1-3 set to PHY_INTERFACE_MODE_10G_QXGMII? Is port 4
interface mode consistent with the strapping?

Andrew