netdev - Re: [PATCH v3 1/8] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property

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Message-ID: <20200525090718.GB16796@amd>
Date:   Mon, 25 May 2020 11:07:18 +0200
From:   Pavel Machek <pavel@....cz>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        robh+dt@...nel.org, andrew@...n.ch,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        jianxin.pan@...ogic.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/8] dt-bindings: net: meson-dwmac: Add the
 amlogic,rx-delay-ns property

Hi!

> > On Tue 2020-05-12 23:10:56, Martin Blumenstingl wrote:
> >> The PRG_ETHERNET registers on Meson8b and newer SoCs can add an RX
> >> delay. Add a property with the known supported values so it can be
> >> configured according to the board layout.
> >>
> >> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> >> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> >> ---
> >>  .../bindings/net/amlogic,meson-dwmac.yaml           | 13 +++++++++++++
> >>  1 file changed, 13 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> >> index ae91aa9d8616..66074314e57a 100644
> >> --- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> >> +++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
> >> @@ -67,6 +67,19 @@ allOf:
> >>              PHY and MAC are adding a delay).
> >>              Any configuration is ignored when the phy-mode is set to "rmii".
> >>  
> >> +        amlogic,rx-delay-ns:
> >> +          enum:
> > 
> > Is it likely other MACs will need rx-delay property, too? Should we get rid of the amlogic,
> > prefix?
> 
> Yes, there are several MAC bindings that already define a delay property:
> 
> Documentation/devicetree/bindings/net/allwinner,sun8i-a83t-emac.yaml:
>      allwinner,rx-delay-ps:
> Documentation/devicetree/bindings/net/allwinner,sun8i-a83t-emac.yaml:
>      allwinner,rx-delay-ps:
> Documentation/devicetree/bindings/net/apm-xgene-enet.txt:- rx-delay:
> Delay value for RGMII bridge RX clock.
> Documentation/devicetree/bindings/net/apm-xgene-enet.txt:       rx-delay
> = <2>;
> Documentation/devicetree/bindings/net/cavium-pip.txt:- rx-delay: Delay
> value for RGMII receive clock. Optional. Disabled if 0.
> Documentation/devicetree/bindings/net/mediatek-dwmac.txt:-
> mediatek,rx-delay-ps: RX clock delay macro value. Default is 0.
> Documentation/devicetree/bindings/net/mediatek-dwmac.txt:
> mediatek,rx-delay-ps = <1530>;
> 
> standardizing on rx-delay-ps and tx-delay-ps would make sense since that
> is the lowest resolution and the property would be correctly named with
> an unit in the name.

Seems like similar patch is already being reviewed from Dan Murphy (?)
from TI.

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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