linux-kernel - Re: [RFC PATCH v3 net-next 09/10] net: dsa: ocelot: felix: add support for VSC75XX control over SPI

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Message-ID: <20210815191029.GA3328995@euler>
Date:   Sun, 15 Aug 2021 12:10:29 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <olteanv@...il.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, hkallweit1@...il.com,
        linux@...linux.org.uk, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 net-next 09/10] net: dsa: ocelot: felix: add
 support for VSC75XX control over SPI

On Sat, Aug 14, 2021 at 03:02:11PM +0300, Vladimir Oltean wrote:
> On Sat, Aug 14, 2021 at 02:43:29PM +0300, Vladimir Oltean wrote:
> > The issue is that the registers for the PCS1G block look nothing like
> > the MDIO clause 22 layout, so anything that tries to map the struct
> > ocelot_pcs over a struct mdio_device is going to look like a horrible
> > shoehorn.
> > 
> > For that we might need Russell's assistance.
> > 
> > The documentation is at:
> > http://ww1.microchip.com/downloads/en/DeviceDoc/VMDS-10489.pdf
> > search for "Information about the registers for this product is available in the attached file."
> > and then open the PDF embedded within the PDF.
> 
> In fact I do notice now that as long as you don't use any of the
> optional phylink_mii_c22_pcs_* helpers in your PCS driver, then
> struct phylink_pcs has pretty much zero dependency on struct mdio_device,
> which means that I'm wrong and it should be completely within reach to
> write a dedicated PCS driver for this hardware.
> 
> As to how to make the common felix.c work with different implementations
> of struct phylink_pcs, one thing that certainly has to change is that
> struct felix should hold a struct phylink_pcs **pcs and not a
> struct lynx_pcs **pcs.
> 
> Does this mean that we should refactor lynx_pcs_create() to return a
> struct phylink_pcs * instead of struct lynx_pcs *, and lynx_pcs_destroy()
> to receive the struct phylink_pcs *, use container_of() and free the
> larger struct lynx_pcs *? Yes, probably.
> 
> If you feel uncomfortable with this, I can try to refactor lynx_pcs to
> make it easier to accomodate a different PCS driver in felix.

I think this is pretty straightforward. That seems like the same thing
I'd done to get regmap working in this patch since my first attempt.

Should this be a new commit in this patchset or a standalone patch?