netdev - Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Provide dummy implementations for trunk setters

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Date:   Fri, 15 Jan 2021 16:53:47 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Tobias Waldekranz <tobias@...dekranz.com>, davem@...emloft.net,
        kuba@...nel.org, vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: dsa: mv88e6xxx: Provide dummy
 implementations for trunk setters

On Fri, Jan 15, 2021 at 03:48:36PM +0100, Andrew Lunn wrote:
> On Fri, Jan 15, 2021 at 04:36:49PM +0200, Vladimir Oltean wrote:
> > On Fri, Jan 15, 2021 at 03:30:30PM +0100, Andrew Lunn wrote:
> > > On Fri, Jan 15, 2021 at 11:58:33AM +0100, Tobias Waldekranz wrote:
> > > > Support for Global 2 registers is build-time optional.
> > >
> > > I was never particularly happy about that. Maybe we should revisit
> > > what features we loose when global 2 is dropped, and see if it still
> > > makes sense to have it as optional?
> >
> > Marvell switch newbie here, what do you mean "global 2 is dropped"?
>
> I was not aware detect() actually enforced it when needed. It used to
> be, you could leave it out, and you would just get reduced
> functionality for devices which had global2, but the code was not
> compiled in.
>
> At the beginning of the life of this driver, i guess it was maybe
> 25%/75% without/with global2, so it might of made sense to reduce the
> binary size. But today the driver is much bigger with lots of other
> things which those early chips don't have, SERDES for example. And
> that ratio has dramatically reduced, there are very few devices
> without those registers. This is why i think we can make our lives
> easier and make global2 always compiled in.

That makes sense, I thought you meant something else by "global 2
support is dropped", nevermind.