linux-kernel - RE: [PATCH net-next v3 3/3] phy: mscc: Add support for VSC8531

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Message-ID: <BYAPR12MB47731D5AAC7091F89C2CA9AC9E749@BYAPR12MB4773.namprd12.prod.outlook.com>
Date:   Thu, 11 May 2023 16:17:21 +0000
From:   "Katakam, Harini" <harini.katakam@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "vladimir.oltean@....com" <vladimir.oltean@....com>,
        "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
        "simon.horman@...igine.com" <simon.horman@...igine.com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "harinikatakamlinux@...il.com" <harinikatakamlinux@...il.com>,
        "Simek, Michal" <michal.simek@....com>,
        "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
Subject: RE: [PATCH net-next v3 3/3] phy: mscc: Add support for VSC8531_02

Hi Andrew,

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Thursday, May 11, 2023 7:42 PM
> To: Katakam, Harini <harini.katakam@....com>
> Cc: hkallweit1@...il.com; linux@...linux.org.uk; davem@...emloft.net;
> kuba@...nel.org; edumazet@...gle.com; pabeni@...hat.com;
> vladimir.oltean@....com; wsa+renesas@...g-engineering.com;
> simon.horman@...igine.com; mkl@...gutronix.de;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> harinikatakamlinux@...il.com; Simek, Michal <michal.simek@....com>;
> Pandey, Radhey Shyam <radhey.shyam.pandey@....com>
> Subject: Re: [PATCH net-next v3 3/3] phy: mscc: Add support for VSC8531_02
> 
> On Thu, May 11, 2023 at 05:38:08PM +0530, Harini Katakam wrote:
> > Add support for VSC8531_02 (Rev 2) device. Use exact PHY ID match.
> >
> > Signed-off-by: Harini Katakam <harini.katakam@....com>
> > ---
> > v3 - Patch split
> >
> >  drivers/net/phy/mscc/mscc.h      |  1 +
> >  drivers/net/phy/mscc/mscc_main.c | 26 ++++++++++++++++++++++++--
> >  2 files changed, 25 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
> > index ab6c0b7c2136..6a0521ff61d2 100644
> > --- a/drivers/net/phy/mscc/mscc.h
> > +++ b/drivers/net/phy/mscc/mscc.h
> > @@ -281,6 +281,7 @@ enum rgmii_clock_delay {
> >  #define PHY_ID_VSC8514			  0x00070670
> >  #define PHY_ID_VSC8530			  0x00070560
> >  #define PHY_ID_VSC8531			  0x00070570
> > +#define PHY_ID_VSC8531_02		  0x00070572
> 
> Does PHY_ID_VSC8531_01 exist? The current code would support that,
> where as now i don't think any entry will match.

Yes, PHY_ID_VSC8531_01 exists:
https://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10494.pdf
And I'm sorry I realize now that this patch breaks that version.

Also considering your RC on the other thread,
" Just to make it clear why the existing PHY_ID_VSC853/0xfffffff0 is not sufficient."
Currently there is no difference in the phy driver structure between
VSC8531 and VSC8531_02. Let me double check the identification on
my board and skip this patch if possible. The RGMII delay support in
2/3 is generic anyway.

Regards,
Harini