linux-kernel - Re: [PATCH net-next v2 5/9] net: ethernet: oa_tc6: implement internal PHY initialization

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Message-ID: <c67b0e57-b87b-45cd-b3fd-be11b0670b0d@lunn.ch>
Date:   Tue, 31 Oct 2023 13:48:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Parthiban.Veerasooran@...rochip.com
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        corbet@....net, Steen.Hegelund@...rochip.com,
        rdunlap@...radead.org, horms@...nel.org, casper.casan@...il.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Horatiu.Vultur@...rochip.com, Woojung.Huh@...rochip.com,
        Nicolas.Ferre@...rochip.com, UNGLinuxDriver@...rochip.com,
        Thorsten.Kummermehr@...rochip.com
Subject: Re: [PATCH net-next v2 5/9] net: ethernet: oa_tc6: implement
 internal PHY initialization

> >> +             tc6->mdiobus = mdiobus_alloc();
> >> +             if (!tc6->mdiobus) {
> >> +                     netdev_err(tc6->netdev, "MDIO bus alloc failed\n");
> >> +                     return -ENODEV;
> >> +             }
> >> +
> >> +             tc6->mdiobus->phy_mask = ~(u32)BIT(1);
> > 
> > Does the standard define this ? BIT(1), not BIT(0)?
> Ok, I think here is a typo. Will correct it.

There is still the open question, does the standard define this? If
not, a vendor might decide to use some other address, not 0. So it
might be better to not set a mask and scan the whole bus.
phy_find_first() should then work, no matter what address it is using.

	Andrew