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From:   Parshuram Raju Thombare <pthombar@cadence.com>
To:     Russell King - ARM Linux admin <linux@armlinux.org.uk>
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Subject: RE: [PATCH v5 2/5] net: macb: add support for sgmii MAC-PHY interface
Thread-Topic: [PATCH v5 2/5] net: macb: add support for sgmii MAC-PHY
 interface
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Date:   Tue, 25 Jun 2019 09:38:37 +0000
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>> >In which case, gem_phylink_validate() must clear the support mask when
>> >SGMII mode is requested to indicate that the interface mode is not
>> >supported.
>> >The same goes for _all_ other PHY link modes that the hardware does not
>> >actually support, such as PHY_INTERFACE_MODE_10GKR...
>> If interface is not supported by hardware probe returns with error, so w=
e don't
>> net interface is not registered at all.
>That does not negate my comment above.
Sorry if I misunderstood your question, but hardware supports interfaces an=
d based
on that link modes are supported. So if interface is not supported by hardw=
are,
net device is not registered and there will be no phylink_validate call.
If hardware support particular interface, link modes supported by interface
are added to (not cleared from) supported mask, provided configs is not try=
ing to limit=20
data rate using GIGABIT_ENABLE* macro.

Regards,
Parshuram Thombare