netdev - RE: [PATCH net-next v2 0/4] net: ethernet: renesas: rswitch: Modify initialization for SERDES and PHY

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Message-ID: <TYBPR01MB534184D1D7CFBECBA2C4AD64D8FD9@TYBPR01MB5341.jpnprd01.prod.outlook.com>
Date:   Thu, 12 Jan 2023 01:09:07 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Russell King <linux@...linux.org.uk>
CC:     "andrew@...n.ch" <andrew@...n.ch>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH net-next v2 0/4] net: ethernet: renesas: rswitch: Modify
 initialization for SERDES and PHY

Hi Russell,

> From: Russell King, Sent: Tuesday, January 10, 2023 11:36 PM
> 
> On Tue, Jan 10, 2023 at 02:02:02PM +0900, Yoshihiro Shimoda wrote:
> > The patch [1/4] sets phydev->host_interfaces by phylink for Marvell PHY
> > driver (marvell10g) to initialize the MACTYPE.
> 
> I don't yet understand the "why" behind the need for this. Doesn't your
> platform strap the 88x3310 correctly, so MACTYPE is properly set?

Oops! I should have shared why the patches are needed.

You're correct.
- My platform has the 88x2110.
- The MACTYPE setting of strap pin on the platform is SXGMII.
- However, we realized that the SoC cannot communicate the PHY with SXGMII
  because of mismatching hardware specification.
- We have a lot of boards which mismatch the MACTYPE setting.

So, I would like to change the MACTYPE as SGMII by software for the platform.

Best regards,
Yoshihiro Shimoda