netdev - Re: Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS related?

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Message-ID: <aNEVX9ew-5kPB22u@shell.armlinux.org.uk>
Date: Mon, 22 Sep 2025 10:22:39 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Zoo Moo <zoomoo100@...ton.me>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Marcin Wojtas <mw@...ihalf.com>
Subject: Re: Marvell 375 and Marvel 88E1514 Phy network problem: mvpp2 or DTS
 related?

On Mon, Sep 22, 2025 at 08:58:49AM +0000, Zoo Moo wrote:
> Sent with Proton Mail secure email.
> 
> On Sunday, 21 September 2025 at 19:56, Russell King (Oracle) <linux@...linux.org.uk> wrote:
> 
> > On Sun, Sep 21, 2025 at 09:05:18AM +0000, Zoo Moo wrote:
> > 
> 
> > > Hi,
> > > 
> 
> > > Bodhi from Doozan (https://forum.doozan.com) has been helping me try to get Debian to work on a Synology DS215j NAS. The DS215j is based on a Marvell Armada 375 (88F6720) and uses a Marvel 88E1514 PHY.
> > 
> 
> > 
> 
> > Probably wrong RGMII phy-mode. I see you're using rgmii-id. Maybe that
> > isn't correct. Just a guess based on the problems that RGMII normally
> > causes.
> 
> Hi Russell,
> 
> Thanks, we did try different drivers (gmii, sgmii), but they didn't help, details in this message https://forum.doozan.com/read.php?2,138851,139291#msg-139291.

What I was meaning was not to try stuff like "SGMII", but try the _other_
three flavours of RGMII. In other words:

	rgmii
	rgmii-txid
	rgmii-rxid

If u-boot works, and it's using RGMII, then it's definitely one of the
four flavours of RGMII interface.

No need to post the failures of the testing to the forums - just say
here whether any of those result in packet flow or not. Nothing else
should change - the only difference between these modes are the timings
of the RGMII interface, and having the wrong mode is the most common
reason for RGMII not working.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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