Re: [PATCH 05/12] net: phy: add phy_id_broken support

[Marco Felsch]

On 23-04-05, Florian Fainelli wrote:
> On 4/5/2023 5:27 AM, Andrew Lunn wrote:
> > On Wed, Apr 05, 2023 at 11:26:56AM +0200, Marco Felsch wrote:
> > > Some phy's don't report the correct phy-id, e.g. the TJA1102 dual-port
> > > report 0 for the 2nd port. To fix this a driver needs to supply the
> > > phyid instead and tell the phy framework to not try to readout the
> > > phyid. The latter case is done via the new 'phy_id_broken' flag which
> > > tells the phy framework to skip phyid readout for the corresponding phy.
> > 
> > In general, we try to avoid work around for broken hardware in the
> > core. Please try to solve this within nxp-tja11xx.c.
> 
> Agreed, and one way to solve working around broken PHY identification
> registers is to provide them through the compatible string via
> "ethernet-phyAAAA.BBBB". This forces the PHY library not to read from those
> registers yet instantiate the PHY device and force it to bind to a certain
> phy_driver.

The nxp-tja11xx.c is a bit special in case of two-port devices since the
2nd port registers a 2nd phy device which is correct but don't have a
dedicated compatible and so on. My 2nd idea here was to check if phy_id
is !0 and in this case just use it. I went this way to make it a bit
more explicit.

Regards,
  Marco


> -- 
> Florian
>