linux-kernel - Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is

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Date:   Sat, 21 May 2022 20:39:02 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Cc:     michael@...rulasolutions.com, alberto.bianchi@...rulasolutions.com,
        linux-amarula@...rulasolutions.com, linuxfancy@...glegroups.com,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if
 phy_interface_is_rgmii

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@...rulasolutions.com>
> Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
> Suggested-by: Alberto Bianchi <alberto.bianchi@...rulasolutions.com>
> Tested-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>

Reviewed-by: Andrew Lunn <andrew@...n.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