linux-kernel - Re: [PATCH v5 05/10] dt-bindings: net: dwmac-sun8i: update documentation about integrated PHY

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Message-ID: <20170919053112.GA15105@Red>
Date:   Tue, 19 Sep 2017 07:31:12 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     robh@...nel.org
Cc:     Rob Herring <robh@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        mark.rutland@....com, wens@...e.org, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com,
        peppe.cavallaro@...com, alexandre.torgue@...com,
        f.fainelli@...il.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, andrew@...n.ch
Subject: Re: [PATCH v5 05/10] dt-bindings: net: dwmac-sun8i: update
 documentation about integrated PHY

On Thu, Sep 14, 2017 at 09:19:49PM +0200, Andrew Lunn wrote:
> > > Is the MDIO controller "allwinner,sun8i-h3-emac" or "snps,dwmac-mdio"? 
> > > If the latter, then I think the node is fine, but then the mux should be 
> > > a child node of it. IOW, the child of an MDIO controller should either 
> > > be a mux node or slave devices.
> 
> Hi Rob
> 
> Up until now, children of an MDIO bus have been MDIO devices. Those
> MDIO devices are either Ethernet PHYs, Ethernet Switches, or the
> oddball devices that Broadcom iProc has, like generic PHYs.
> 
> We have never had MDIO-muxes as MDIO children. A Mux is not an MDIO
> device, and does not have the properties of an MDIO device. It is not
> addressable on the MDIO bus. The current MUXes are addressed via GPIOs
> or MMIO.
> 
> There other similar cases. i2c-mux-gpio is not a child of an i2c bus,
> nor i2c-mux-reg or gpio-mux. nxp,pca9548 is however a child of the i2c
> bus, because it is an i2c device itself...
> 
> If the MDIO mux was an MDIO device, i would agree with you. Bit it is
> not, so lets not make it a child.
> 
> 	    Andrew

Hello Rob, could you anwser/confirm please.
I wait on this for sending the next version.

Thanks
Regards
Corentin Labbe