netdev - Re: [PATCH] dt-bindings: net: renesas,ethertsn: Add bindings for Ethernet TSN

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Date: Tue, 21 Nov 2023 09:00:41 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, devicetree@...r.kernel.org, 
	netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: net: renesas,ethertsn: Add bindings for
 Ethernet TSN

On Tue, Nov 21, 2023 at 8:45 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
> On 20/11/2023 17:07, Niklas Söderlund wrote:
> > Add bindings for Renesas R-Car Ethernet TSN End-station IP. The RTSN
> > device provides Ethernet network.
> >
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/renesas,ethertsn.yaml
> > @@ -0,0 +1,133 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/renesas,ethertsn.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Renesas Ethernet TSN End-station
> > +
> > +maintainers:
> > +  - Niklas Söderlund <niklas.soderlund@...natech.se>
> > +
> > +description:
> > +  The RTSN device provides Ethernet network using a 10 Mbps, 100 Mbps, or 1
> > +  Gbps full-duplex link via MII/GMII/RMII/RGMII. Depending on the connected PHY.
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - items:
>
> Drop items.
>
> I assume you have oneOf above because you predict this will grow with
> entries with fallbacks? If not, drop.
>
> > +          - enum:
> > +              - renesas,ethertsn-r8a779g0      # R-Car V4H

renesas,r8a779g0-ethertsn

R-Car S4 also has EtherTSN.
Is it identical, so it makes sense to add a renesas,rcar-gen4-ethertsn
fallback?

> > +  renesas,rx-internal-delay:
> > +    type: boolean
> > +    description:
> > +      Enable internal Rx clock delay, typically 1.8ns.
>
> Why this is bool, not delay in ns?
> Why this is property of a board (not SoC)?

Standard property is rx-internal-delay-ps.

> > +
> > +  renesas,tx-internal-delay:
> > +    type: boolean
> > +    description:
> > +      Enable internal Tx clock delay, typically 2.0ns.
>
> Same questions.

Standard property is tx-internal-delay-ps.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds