netdev - Re: [PATCH net-next] net: phy: meson-gxl: support more G12A-internal PHY versions

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Date:   Mon, 16 Jan 2023 01:12:02 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>
Subject: Re: [PATCH net-next] net: phy: meson-gxl: support more G12A-internal
 PHY versions

Hi Heiner,

On Mon, 16 Jan 2023 at 00:14, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> Hi Heiner,
>
> Le 15/01/2023 à 18:09, Heiner Kallweit a écrit :
> > On 15.01.2023 17:57, Andrew Lunn wrote:
> >> On Sun, Jan 15, 2023 at 04:19:37PM +0100, Heiner Kallweit wrote:
> >>> On my SC2-based system the genphy driver was used because the PHY
> >>> identifies as 0x01803300. It works normal with the meson g12a
> >>> driver after this change.
> >>> Switch to PHY_ID_MATCH_MODEL to cover the different sub-versions.
> >>
> >> Hi Heiner
> >>
> >> Are there any datasheets for these devices? Anything which documents
> >> the lower nibble really is a revision?
> >>
> >> I'm just trying to avoid future problems where we find it is actually
> >> a different PHY, needs its own MATCH_EXACT entry, and then we find we
> >> break devices using 0x01803302 which we had no idea exists, but got
> >> covered by this change.
> >>
> > The SC2 platform inherited a lot from G12A, therefore it's plausible
> > that it's the same PHY. Also the vendor driver for SC2 gives a hint
> > as it has the following compatible for the PHY:
> >
> > compatible = "ethernet-phy-id0180.3301", "ethernet-phy-ieee802.3-c22";
> >
> > But you're right, I can't say for sure as I don't have the datasheets.
>
> On G12A (& GXL), the PHY ID is set in the MDIO MUX registers,
> please see:
> https://elixir.bootlin.com/linux/latest/source/drivers/net/mdio/mdio-mux-meson-g12a.c#L36
>
> So you should either add support for the PHY mux in SC2 or check
> what is in the ETH_PHY_CNTL0 register.
>

I you want to read the ethernet id, we can use the following tool

[0] https://github.com/wkz/mdio-tools

om my odroid-n2 it show
alarm@...oid-n2:~/mdio-tools$ sudo mdio mdio_mux-0.0
 DEV      PHY-ID  LINK
0x00  0x001cc916  down
0x01  0x001cc916  up

-Anand

> Neil
>
> >
> >>      Andrew
> >
> > Heiner
>
>
> _______________________________________________
> linux-amlogic mailing list
> linux-amlogic@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-amlogic

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