netdev - Re: [PATCH net-next 0/3] net: phy: Support enabling clocks prior to bus probe

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Date:   Fri, 4 Sep 2020 15:45:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Adam Rudziński <adam.rudzinski@....net.pl>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        m.felsch@...gutronix.de, hkallweit1@...il.com,
        richard.leitner@...data.com, zhengdejin5@...il.com,
        devicetree@...r.kernel.org, kernel@...gutronix.de, kuba@...nel.org,
        robh+dt@...nel.org
Subject: Re: [PATCH net-next 0/3] net: phy: Support enabling clocks prior to
 bus probe

> Just a bunch of questions.
> 
> Actually, why is it necessary to have a full MDIO bus scan already during
> probing peripherals?

That is the Linux bus model. It does not matter what sort of bus it
is, PCI, USB, MDIO, etc. When the bus driver is loaded, the bus is
enumerated and drivers probe for each device found on the bus.

> I'd say that it is not necessary to have a PHY getting found before it is
> needed to setup the complete interface.

It is like saying, we don't need to probe the keyboard until the first
time the "Press Enter" prompt is given?

     Andrew