linux-kernel - Re: [PATCH 1/8] net: phy: realtek: rtl8221: allow to configure SERDES mode

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Message-ID: <ZFzXPGeob0q4DTza@pidgin.makrotopia.org>
Date:   Thu, 11 May 2023 13:53:53 +0200
From:   Daniel Golle <daniel@...rotopia.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        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>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/8] net: phy: realtek: rtl8221: allow to configure
 SERDES mode

On Thu, May 11, 2023 at 02:41:07AM +0200, Andrew Lunn wrote:
> > +#define RTL8221B_MMD_SERDES_CTRL		MDIO_MMD_VEND1
> > +#define RTL8221B_MMD_PHY_CTRL			MDIO_MMD_VEND2
> 
> I suggest you don't do this. Use MDIO_MMD_VEND[1|2] to make it clear
> these are vendor registers.

Ack, I will not introduce new macros to label them, but just use
MDIO_MMD_VEND1 and MDIO_MMD_VEND2 then.

> 
> > +	case RTL8221B_SERDES_OPTION_MODE_2500BASEX_SGMII:
> > +	case RTL8221B_SERDES_OPTION_MODE_2500BASEX:
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6a04, 0x0503);
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f10, 0xd455);
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f11, 0x8020);
> > +		break;
> > +	case RTL8221B_SERDES_OPTION_MODE_HISGMII_SGMII:
> > +	case RTL8221B_SERDES_OPTION_MODE_HISGMII:
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6a04, 0x0503);
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f10, 0xd433);
> > +		phy_write_mmd(phydev, RTL8221B_MMD_SERDES_CTRL, 0x6f11, 0x8020);
> > +		break;
> > +	}
> 
> Is there anything in the datasheet to indicate register names and what
> the values mean? It would be good to replace these magic values with
> #defines.

Unfortunately they are only mentioned as magic values which have to be
written to magic registers also in the datasheet :(