linux-kernel - Re: [RFC PATCH v2 net-next 2/8] net: dsa: ocelot: felix: move MDIO access to a common location

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Message-ID: <20210710195913.owqvc7llnya74axl@skbuf>
Date:   Sat, 10 Jul 2021 22:59:13 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        claudiu.manoil@....com, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, linux@...linux.org.uk,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 net-next 2/8] net: dsa: ocelot: felix: move MDIO
 access to a common location

On Sat, Jul 10, 2021 at 12:25:56PM -0700, Colin Foster wrote:
> Indirect MDIO access is a feature that doesn't need to be specific to the
> Seville driver. Separate the feature to a common file so it can be shared.
> 
> Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> ---

In fact, this same piece of hardware has a dedicated driver inside
drivers/net/mdio/mdio-mscc-miim.c. The only problem is that it doesn't
work with regmap, and especially not with a caller-supplied regmap. I
was too lazy to do that, but it is probably what should have been done.

By comparison, felix_vsc9959.c was coded up to work with an internal
MDIO bus whose ops are implemented by another driver (enetc_mdio). Maybe
you could take that as an example and have mdio-mscc-miim.c drive both
seville and ocelot.