[PATCH v2] ARM: imx: imx8mn-ddr4-evk: Add ethernet support

Marek Vasut marex at denx.de
Tue Feb 22 11:12:39 CET 2022

On 2/22/22 08:35, Frieder Schrempf wrote:
> Hi Marek,


>>>> +int board_phy_config(struct phy_device *phydev)
>>>> +{
>>>> +    /* enable rgmii rxc skew and phy mode select to RGMII copper */
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x1f);
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x8);
>>>> +
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x00);
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x82ee);
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x05);
>>>> +    phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x100);
>>> This is a AR8031, correct?  Is there a reason why you don't use the
>>> device tree binding to set RGMII voltage, and RX and tx delays?
>> I quickly cobbled this together from another board, since I needed
>> ethernet to do other tests with this board and the ethernet support was
>> missing. If you can send subsequent patch to flip this to DT-only setup,
>> I can test the patch on the board.
> So why don't you post it as RFC?
> To be honest it seems a bit contradictory that you normally take a
> critical position on other people's patches when they use legacy code
> instead of DM/DT (which is alright) and then send a half-baked approach
> yourself and expect other people to fix it for you afterwards.
> I don't want to complain, it just occurred to me.

It's just a patch I had half-baked in a tree for over a year, so I sent 
it. It didn't occur to me there is now a way to do this in DT, since the 
patch was in my tree for so long and I only dealt with the ar803x PHY 
recently. I will try and convert this to DT next time I have the board 
on my desk, but if someone is faster ... even better.

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