linux-kernel - Re: [PATCH v3 3/4] net: stmmac: register parent MDIO node for sun8i-h3-emac

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Message-ID: <20170820065757.GA6081@Red>
Date:   Sun, 20 Aug 2017 08:57:57 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] net: stmmac: register parent MDIO node for
 sun8i-h3-emac

On Sat, Aug 19, 2017 at 10:38:36PM +0200, Andrew Lunn wrote:
> On Sat, Aug 19, 2017 at 08:50:25PM +0200, Corentin Labbe wrote:
> > On Sat, Aug 19, 2017 at 01:05:21AM +0800, Chen-Yu Tsai wrote:
> > > On Fri, Aug 18, 2017 at 8:21 PM, Corentin Labbe
> > > <clabbe.montjoie@...il.com> wrote:
> > > > In case of a MDIO switch, the registered MDIO node should be
> > > > the parent of the PHY. Otherwise of_phy_connect will fail.
> 
> Hi Corentin
> 
> Sorry, I missed this patch series. Looking at patchwork...

That's my fault, I forgot to set you in recipient like in last send.

> 
> Can you represent the MDIO mux using 
> 
> Documentation/devicetree/bindings/net/mdio-mux-mmioreg.txt
> 
> It would be better if you could reuse existing infrastructure than
> invent something new.
> 

I think we cannot use mdio-mux-mmioreg since the register for doing the switch is in middle of the "System Control" and shared with other functions.
This is why we use a sycon/regmap for selecting the MDIO.

Regards