linux-kernel - Re: [RFC PATCH 1/5] net: dsa: mv88e6xxx: introduce support for two chips using direct smi addressing

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Message-ID: <20190508094132.GB13389@t480s.localdomain>
Date:   Wed, 8 May 2019 09:41:32 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [RFC PATCH 1/5] net: dsa: mv88e6xxx: introduce support for two
 chips using direct smi addressing

Hi Rasmus,

On Wed, 8 May 2019 13:47:15 +0200, Andrew Lunn <andrew@...n.ch> wrote:
> > > 
> > > This works, but i think i prefer adding mv88e6xxx_smi_dual_chip_write,
> > > mv88e6xxx_smi_dual_chip_read, and create a
> > > mv88e6xxx_smi_single_chip_ops.
> > 
> > Now that Vivien's "net: dsa: mv88e6xxx: refine SMI support" is in
> > master, do you still prefer introducing a third bus_ops structure
> > (mv88e6xxx_smi_dual_direct_ops ?), or would the approach of adding
> > chip->sw_addr in the smi_direct_{read/write} functions be ok (which
> > would then require changing the indirect callers to pass 0 instead of
> > chip->swaddr).
> 
> I would still prefer a new bus_ops.

Even though those are direct read and write operations, having 3
mv88e6xxx_bus_ops structures will make it clear that there are 3 ways
for accessible the internal switch registers through SMI, depending
on the Marvell chip model.  So I would prefer a third ops as well.

Thanks,
Vivien