netdev - Re: [PATCH v4 03/13] dt-bindings: net: Add a YAML schemas for the generic MDIO options

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Date:   Thu, 27 Jun 2019 17:57:08 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Frank Rowand <frowand.list@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        netdev <netdev@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Antoine Ténart <antoine.tenart@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v4 03/13] dt-bindings: net: Add a YAML schemas for the
 generic MDIO options

Hi Rob,

On Thu, Jun 27, 2019 at 09:48:06AM -0600, Rob Herring wrote:
> On Thu, Jun 27, 2019 at 9:32 AM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> >
> > The MDIO buses have a number of available device tree properties that can
> > be used in their device tree node. Add a YAML schemas for those.
> >
> > Suggested-by: Andrew Lunn <andrew@...n.ch>
> > Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> > ---
> >  Documentation/devicetree/bindings/net/mdio.txt  | 38 +-------------
> >  Documentation/devicetree/bindings/net/mdio.yaml | 51 ++++++++++++++++++-
> >  2 files changed, 52 insertions(+), 37 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/net/mdio.yaml
>
> Reviewed-by: Rob Herring <robh@...nel.org>
>
> However, some comments for a follow-up...
>
> > diff --git a/Documentation/devicetree/bindings/net/mdio.yaml b/Documentation/devicetree/bindings/net/mdio.yaml
> > new file mode 100644
> > index 000000000000..b8fa8251c4bc
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/mdio.yaml
> > @@ -0,0 +1,51 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/mdio.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MDIO Bus Generic Binding
> > +
> > +maintainers:
> > +  - Andrew Lunn <andrew@...n.ch>
> > +  - Florian Fainelli <f.fainelli@...il.com>
> > +  - Heiner Kallweit <hkallweit1@...il.com>
> > +
> > +description:
> > +  These are generic properties that can apply to any MDIO bus. Any
> > +  MDIO bus must have a list of child nodes, one per device on the
> > +  bus. These should follow the generic ethernet-phy.yaml document, or
> > +  a device specific binding document.
> > +
> > +properties:
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description:
> > +      The phandle and specifier for the GPIO that controls the RESET
> > +      lines of all PHYs on that MDIO bus.
> > +
> > +  reset-delay-us:
> > +    description:
> > +      RESET pulse width in microseconds. It applies to all PHY devices
> > +      and must therefore be appropriately determined based on all PHY
> > +      requirements (maximum value of all per-PHY RESET pulse widths).
> > +
> > +examples:
> > +  - |
> > +    davinci_mdio: mdio@...30000 {
>
> Can we enforce nodename to be mdio? That may not work for muxes.
> You'll probably have to implement it and see.

Ok, I'll send a follow-up patch for this.

> > +        compatible = "ti,davinci_mdio";
> > +        reg = <0x5c030000 0x1000>;
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
>
> These 2 should have a schema.

Indeed, I'll do it for that too.

> > +
> > +        reset-gpios = <&gpio2 5 1>;
> > +        reset-delay-us = <2>;
> > +
> > +        ethphy0: ethernet-phy@1 {
> > +            reg = <1>;
>
> Need a child node schema to validate the unit-address and reg property.

This should be already covered by the ethernet-phy.yaml schemas
earlier in this series.

Were you expecting something else?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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