Date:   Thu, 20 Jun 2019 11:56:53 +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 v3 03/16] dt-bindings: net: Add a YAML schemas for the
 generic MDIO options

Hi,

On Wed, Jun 19, 2019 at 08:17:52AM -0600, Rob Herring wrote:
> On Wed, Jun 19, 2019 at 3:47 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>
> >
> > ---
> >
> > Changes from v2:
> >   - New patch
> > ---
> >  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
> >
> > diff --git a/Documentation/devicetree/bindings/net/mdio.txt b/Documentation/devicetree/bindings/net/mdio.txt
> > index e3e1603f256c..cf8a0105488e 100644
> > --- a/Documentation/devicetree/bindings/net/mdio.txt
> > +++ b/Documentation/devicetree/bindings/net/mdio.txt
> > @@ -1,37 +1 @@
> > -Common MDIO bus properties.
> > -
> > -These are generic properties that can apply to any MDIO bus.
> > -
> > -Optional properties:
> > -- reset-gpios: One GPIO that control the RESET lines of all PHYs on that MDIO
> > -  bus.
> > -- reset-delay-us: RESET pulse width in microseconds.
> > -
> > -A list of child nodes, one per device on the bus is expected. These
> > -should follow the generic phy.txt, or a device specific binding document.
> > -
> > -The 'reset-delay-us' indicates the RESET signal pulse width in microseconds and
> > -applies to all PHY devices. It must therefore be appropriately determined based
> > -on all PHY requirements (maximum value of all per-PHY RESET pulse widths).
> > -
> > -Example :
> > -This example shows these optional properties, plus other properties
> > -required for the TI Davinci MDIO driver.
> > -
> > -       davinci_mdio: ethernet@...30000 {
> > -               compatible = "ti,davinci_mdio";
> > -               reg = <0x5c030000 0x1000>;
> > -               #address-cells = <1>;
> > -               #size-cells = <0>;
> > -
> > -               reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
> > -               reset-delay-us = <2>;
> > -
> > -               ethphy0: ethernet-phy@1 {
> > -                       reg = <1>;
> > -               };
> > -
> > -               ethphy1: ethernet-phy@3 {
> > -                       reg = <3>;
> > -               };
> > -       };
> > +This file has moved to mdio.yaml.
> > diff --git a/Documentation/devicetree/bindings/net/mdio.yaml b/Documentation/devicetree/bindings/net/mdio.yaml
> > new file mode 100644
> > index 000000000000..8f4f9d0a2882
> > --- /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: ethernet@...30000 {
>
> Shouldn't this be mdio@... ?

Yeah, I'll fix it.

> > +        compatible = "ti,davinci_mdio";
> > +        reg = <0x5c030000 0x1000>;
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        reset-gpios = <&gpio2 5 1>;
> > +        reset-delay-us = <2>;
> > +
> > +        ethphy0: ethernet-phy@1 {
>
> Would be good to have some unit-address checks. Could be a follow-up
> though.

I guess this could be good, but I'm not sure how to do that. We could
add a patternProperties with the proper regex, but that would find
some issues only if we have additionalProperties set, which we don't
want since this is a generic binding and that would create another set
of problems :)

maxime

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

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