netdev - Re: [PATCH net-next] net: gemini: allow any RGMII interface mode

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Date:   Tue, 4 Jan 2022 17:48:58 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        LABBE Corentin <clabbe.montjoie@...il.com>
Subject: Re: [PATCH net-next] net: gemini: allow any RGMII interface mode

On Tue, Jan 4, 2022 at 5:38 PM Russell King (Oracle)
<rmk+kernel@...linux.org.uk> wrote:

> The four RGMII interface modes take care of the required RGMII delay
> configuration at the PHY and should not be limited by the network MAC
> driver. Sadly, gemini was only permitting RGMII mode with no delays,
> which would require the required delay to be inserted via PCB tracking
> or by the MAC.
>
> However, there are designs that require the PHY to add the delay, which
> is impossible without Gemini permitting the other three PHY interface
> modes. Fix the driver to allow these.
>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Excellent root-cause analysis of this and thanks!
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij