netdev - Re: [PATCH next-next] net: phy: realtek: add support for rtl8224 2.5Gbps PHY

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Date: Wed, 12 Jun 2024 09:07:07 +0200
From: Marek Behún <kabel@...nel.org>
To: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc: "andrew@...n.ch" <andrew@...n.ch>, "hkallweit1@...il.com"
 <hkallweit1@...il.com>, "linux@...linux.org.uk" <linux@...linux.org.uk>,
 "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-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>, "ericwouds@...il.com" <ericwouds@...il.com>
Subject: Re: [PATCH next-next] net: phy: realtek: add support for rtl8224
 2.5Gbps PHY

On Tue, 11 Jun 2024 20:42:43 +0000
Chris Packham <Chris.Packham@...iedtelesis.co.nz> wrote:

> +cc Eric W and Marek.
> 
> On 11/06/24 17:34, Chris Packham wrote:
> > The Realtek RTL8224 PHY is a 2.5Gbps capable PHY. It only uses the
> > clause 45 MDIO interface and can leverage the support that has already
> > been added for the other 822x PHYs.
> >
> > Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> > ---
> >
> > Notes:
> >      I'm currently testing this on an older kernel because the board I'm
> >      using has a SOC/DSA switch that has a driver in openwrt for Linux 5.15.
> >      I have tried to selectively back port the bits I need from the other
> >      rtl822x work so this should be all that is required for the rtl8224.
> >      
> >      There's quite a lot that would need forward porting get a working system
> >      against a current kernel so hopefully this is small enough that it can
> >      land while I'm trying to figure out how to untangle all the other bits.
> >      
> >      One thing that may appear lacking is the lack of rate_matching support.
> >      According to the documentation I have know the interface used on the
> >      RTL8224 is (q)uxsgmii so no rate matching is required. As I'm still
> >      trying to get things completely working that may change if I get new
> >      information.
> >
> >   drivers/net/phy/realtek.c | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> > index 7ab41f95dae5..2174893c974f 100644
> > --- a/drivers/net/phy/realtek.c
> > +++ b/drivers/net/phy/realtek.c
> > @@ -1317,6 +1317,14 @@ static struct phy_driver realtek_drvs[] = {
> >   		.resume         = rtlgen_resume,
> >   		.read_page      = rtl821x_read_page,
> >   		.write_page     = rtl821x_write_page,
> > +	}, {
> > +		PHY_ID_MATCH_EXACT(0x001ccad0),
> > +		.name		= "RTL8224 2.5Gbps PHY",
> > +		.get_features   = rtl822x_c45_get_features,
> > +		.config_aneg    = rtl822x_c45_config_aneg,
> > +		.read_status    = rtl822x_c45_read_status,
> > +		.suspend        = genphy_c45_pma_suspend,
> > +		.resume         = rtlgen_c45_resume,
> >   	}, {
> >   		PHY_ID_MATCH_EXACT(0x001cc961),
> >   		.name		= "RTL8366RB Gigabit Ethernet"  

Don't you need rtl822xb_config_init for serdes configuration?

Marek