linux-kernel - RE: [EXT] Re: [PATCH net-next 0/1] net: fec: add C45 MDIO read/write support

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Message-ID: <VI1PR0402MB360079EAAE7042048B2F5AC8FFAB0@VI1PR0402MB3600.eurprd04.prod.outlook.com>
Date:   Tue, 20 Aug 2019 02:32:26 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Andrew Lunn <andrew@...n.ch>,
        Marco Hartmann <marco.hartmann@....com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christian Herber <christian.herber@....com>
Subject: RE: [EXT] Re: [PATCH net-next 0/1] net: fec: add C45 MDIO read/write
 support

From: Andrew Lunn <andrew@...n.ch>
> On Mon, Aug 19, 2019 at 05:11:14PM +0000, Marco Hartmann wrote:
> > As of yet, the Fast Ethernet Controller (FEC) driver only supports
> > Clause 22 conform MDIO transactions. IEEE 802.3ae Clause 45 defines a
> > modified MDIO protocol that uses a two staged access model in order to
> > increase the address space.
> >
> > This patch adds support for Clause 45 conform MDIO read and write
> > operations to the FEC driver.
> 
> Hi Marco
> 
> Do all versions of the FEC hardware support C45? Or do we need to make use
> of the quirk support in this driver to just enable it for some revisions of FEC?
> 
> Thanks
>         Andrew

i.MX legacy platforms like i.MX6/7 series, they doesn't support Write & Read Increment.
But for i.MX8MQ/MM series, it support C45 full features like Write & Read Increment.

For the patch itself, it doesn't support Write & Read Increment, so I think the patch doesn't
need to add quirk support.

Andy