netdev - Re: [PATCH 2/2] at803x: double check SGMII side autoneg

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Date:   Mon, 22 May 2017 16:19:26 -0500
From:   Timur Tabi <timur@...eaurora.org>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Zefir Kurtisi <zefir.kurtisi@...atec.com>, netdev@...r.kernel.org,
        David Miller <davem@...emloft.net>,
        Manoj Iyer <manoj.iyer@...onical.com>, jhugo@...eaurora.org
Subject: Re: [PATCH 2/2] at803x: double check SGMII side autoneg

On 05/22/2017 04:10 PM, Florian Fainelli wrote:
> Even a module argument would be rejected. If you need platform/SoC
> specific behavior propagated down to the PHY driver, several options exist:
> 
> - pass an agreed upon value for phy_flags to of_phy_connect() see
> drivers/net/ethernet/broadcom/tg3.c and
> drivers/net/ethernet/broadcom/genet/bcmgenet.c for instance and update
> the driver to act on that "flags" see drivers/net/phy/broadcom.c and
> drivers/net/phy/bcm7xxx.c

Will this work on ACPI systems as well?  I call phy_connect_direct() instead
of of_phy_connect().  I see some drivers set phydev->dev_flags before
calling phy_connect_direct().

My concern is that this problem occurs only on an at8031 chip, so having my
network driver passing an at8031-specific flag seems out of place.  What
happens if, on some other board, a different PHY is used, and that flag
means something else?

> - register a PHY fixup which is specific to the board/SoC, and have the
> PHY fixup do whatever is necessary for your platform (like setting
> specific registers)

Do you have an example of that?

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