Re: [PATCH net-next 1/2] dt-bindings: net: marvell,aquantia: add properties to override MDI_CFG

[Andrew Lunn]

On Wed, Aug 21, 2024 at 05:08:39PM +0100, Daniel Golle wrote:
> On Wed, Aug 21, 2024 at 06:00:36PM +0200, Andrew Lunn wrote:
> > On Wed, Aug 21, 2024 at 01:46:30PM +0100, Daniel Golle wrote:
> > > Usually the MDI pair order reversal configuration is defined by
> > > bootstrap pin MDI_CFG. Some designs, however, require overriding the MDI
> > > pair order and force either normal or reverse order.
> > 
> > Could you explain that in a bit more detail. Are you talking about
> > changing the order of the 4 pairs? Or reversing the polarity within
> > pairs?
> 
> It's about changing the order of the 4 pairs, either ABCD or DCBA.
> Polarity of each pair is not affected by this.

So when i do

ethtool -s 42 mdix off

to enable straight through, are you saying the PHY actually does
crossover, because the pull-up tells it the wrong thing about how the
cable is wired? And `mdix on` for crossover gives straight?

'mdix auto' just works as expected, since it tried all the
combinations until it works?

      Andrew