linux-kernel - Re: [RFC v1 net-next 8/8] net: dsa: ocelot: add external ocelot switch control

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Date:   Fri, 16 Sep 2022 16:10:36 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee@...nel.org>
Subject: Re: [RFC v1 net-next 8/8] net: dsa: ocelot: add external ocelot
 switch control

On Fri, Sep 16, 2022 at 10:31:47PM +0000, Vladimir Oltean wrote:
> On Fri, Sep 16, 2022 at 09:55:55AM -0700, Colin Foster wrote:
> Yes, please use as much as possible from the ocelot switch library,
> after all you are driving pretty much the same hardware. I'm glad for
> your revelation and sorry that I didn't think of expressing it this way
> sooner. I think the reset procedure used to be slightly different in the
> times when the ocelot_ext DSA driver also took care of setting up what
> is now the responsibility of the ocelot-mfd driver.

That's exactly right. Early on ocelot_ext was doing all sorts of things
that are now the control of ocelot-mfd and the various subsystems. These
couple procedures seem to be the last relics of those early days.

As I cleaned this up, I realized ocelot_ext_reset_phys() is no longer
needed, as it is handled in the MDIO driver. It looks like there won't
be much to remove when this is all said and done :-)

> Between then and
> now, some time has passed (years if I'm not mistaken)

Thanks for reminding me. If I knew then what I know now... maybe I'd ask
the hardware person to spec a different chip ;-)

I'm joking of course, and looking forward to being able to use this
thing!