linux-kernel - Re: [PATCH v6 05/11] dt-bindings: net: dwmac-sun8i: update documentation about integrated PHY

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Message-ID: <20171004190028.GA9208@Red>
Date:   Wed, 4 Oct 2017 21:00:28 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, robh+dt@...nel.org,
        maxime.ripard@...e-electrons.com, f.fainelli@...il.com,
        wens@...e.org
Cc:     mark.rutland@....com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com,
        peppe.cavallaro@...com, alexandre.torgue@...com,
        frowand.list@...il.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v6 05/11] dt-bindings: net: dwmac-sun8i: update
 documentation about integrated PHY

On Thu, Sep 28, 2017 at 09:37:08AM +0200, Corentin Labbe wrote:
> On Wed, Sep 27, 2017 at 04:02:10PM +0200, Andrew Lunn wrote:
> > Hi Corentin
> > 
> > > +Required properties for the mdio-mux node:
> > > +  - compatible = "mdio-mux"
> > 
> > This is too generic. Please add a more specific compatible for this
> > particular mux. You can keep "mdio-mux", since that is what the MDIO
> > subsystem will look for.
> > 
> 
> I will add allwinner,sun8i-h3-mdio-mux
> 
> > > +Required properties of the integrated phy node:
> > >  - clocks: a phandle to the reference clock for the EPHY
> > >  - resets: a phandle to the reset control for the EPHY
> > > +- phy-is-integrated
> > 
> > So the last thing you said is that the mux is not the problem
> > here. Something else is locking up. Did you discover what?
> > 
> > I really would like phy-is-integrated to go away.
> > 
> 
> I have found the problem: by enabling ephy clk/reset the timeout does not occur anymore.
> So we could remove phy-is-integrated by:
> Moving internal phy clk/reset handling in mdio_mux_syscon_switch_fn()
> But this means:
> - getting internalphy node always by manually get internal_mdio/internal_phy (and not by the given phyhandle)
> - doing some unnecessary tasks (enable/scan/disable) when external_phy is needed
> 

Hello

I have get rid of phy-is-integrated, but mdio_mux_syscon_switch_fn need to enable/disable ephy clk/reset.
And so access to internal PHY node.
But current DT made this ugly: (need to find mdio-mux then internalmdio then internal PHY)

Since MAC cannot reset/choose internal MDIO without ephy clk/rst, could we interpret this as thoses clk/rst must be set in emac node.
This will simplify a lot the code.

Regards