linux-kernel - Re: [PATCH v4 13/18] arm64: allwinner: sun50i-a64: add dwmac-sun8i Ethernet driver

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Date:   Mon, 24 Apr 2017 14:24:11 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, wens@...e.org,
        linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, peppe.cavallaro@...com,
        alexandre.torgue@...com, linux-sunxi@...glegroups.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 13/18] arm64: allwinner: sun50i-a64: add dwmac-sun8i
 Ethernet driver

On Wed, Apr 12, 2017 at 02:41:53PM +0200, Maxime Ripard wrote:
> On Wed, Apr 12, 2017 at 01:13:55PM +0200, Corentin Labbe wrote:
> > The dwmac-sun8i is an Ethernet MAC that supports 10/100/1000 Mbit
> > connections. It is very similar to the device found in the Allwinner
> > H3, but lacks the internal 100 Mbit PHY and its associated control
> > bits.
> > This adds the necessary bits to the Allwinner A64 SoC .dtsi, but keeps
> > it disabled at this level.
> > 
> > Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> > ---
> >  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 37 +++++++++++++++++++++++++++
> >  1 file changed, 37 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > index 0b0f4ab..2569827 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> > @@ -287,6 +287,23 @@
> >  				bias-pull-up;
> >  			};
> >  
> > +			rmii_pins: rmii_pins {
> > +				pins = "PD10", "PD11", "PD13", "PD14",
> > +						"PD17", "PD18", "PD19", "PD20",
> > +						"PD22", "PD23";
> 
> Please align the wrapped lines on the first pin.
> 

OK

> > +				function = "emac";
> > +				drive-strength = <40>;
> 
> Do you actually need that for all the boards, or only a few of them?

I have tried to use lower value without success on some boards. (opipc/pine64 in my memory)

Regards
Corentin Labbe