Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

Andrew Lunn
2022-05-21T18:39:22Z

On Sat, May 21, 2022 at 01:58:46AM +0200, Tommaso Merciai wrote:
> RGMII mode can be enable from dp83822 straps, and also writing bit 9
> of register 0x17 - RMII and Status Register (RCSR).
> When phy_interface_is_rgmii rgmii mode must be enabled, same for
> contrary, this prevents malconfigurations of hw straps
>
> References:
> - https://www.ti.com/lit/gpn/dp83822i p66
>
> Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
> Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
> Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

If you want to, you could go further. If bit 9 is clear, bit 5 defines
the mode, either RMII or MII. There are interface modes defined for
these, so you could get bit 5 as well.

Andrew