netdev - Re: [PATCH 2/8] dt-bindings: net: Add a YAML schemas for the generic PHY options

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Message-ID: <20190523143744.GB19369@lunn.ch>
Date:   Thu, 23 May 2019 16:37:44 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        Alexandre Torgue <alexandre.torgue@...com>,
        Antoine Ténart <antoine.tenart@...tlin.com>,
        netdev@...r.kernel.org,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/8] dt-bindings: net: Add a YAML schemas for the generic
 PHY options

On Thu, May 23, 2019 at 11:56:45AM +0200, Maxime Ripard wrote:
> The networking PHYs have a number of available device tree properties that
> can be used in their device tree node. Add a YAML schemas for those.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> ---
>  Documentation/devicetree/bindings/net/ethernet-phy.yaml | 148 +++++++++-
>  Documentation/devicetree/bindings/net/phy.txt           |  80 +-----
>  2 files changed, 149 insertions(+), 79 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/ethernet-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> new file mode 100644
> index 000000000000..eb79ee6db977
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> @@ -0,0 +1,148 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/ethernet-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ethernet PHY Generic Binding
> +
> +maintainers:
> +  - David S. Miller <davem@...emloft.net>
> +
> +properties:
> +  $nodename:
> +    pattern: "^ethernet-phy(@[a-f0-9])?$"
> +
> +  compatible:
> +    oneOf:

I don't know the language. It is valid to have both
ethernet-phy-ieee802.3-c45 and
ethernet-phy-id[a-f0-9]{4}\\.[a-f0-9]{4}$".  Does this oneOf prevent
multiple compatible strings?

Also, the general case is no compatible at all.

> +      - const: ethernet-phy-ieee802.3-c22
> +        description: PHYs that implement IEEE802.3 clause 22
> +      - const: ethernet-phy-ieee802.3-c45
> +        description: PHYs that implement IEEE802.3 clause 45
> +      - pattern: "^ethernet-phy-id[a-f0-9]{4}\\.[a-f0-9]{4}$"
> +        description:
> +          The first group of digits is the 16 bit Phy Identifier 1
> +          register, this is the chip vendor OUI bits 3:18. The
> +          second group of digits is the Phy Identifier 2 register,
> +          this is the chip vendor OUI bits 19:24, followed by 10
> +          bits of a vendor specific ID.

Could we try to retain:

> -  If the PHY reports an incorrect ID (or none at all) then the
> -  "compatible" list may contain an entry with the correct PHY ID in the
     ...

Using it is generally wrong, and that is not clear in the new text.

> +
> +  reg:
> +    maxItems: 1
> +    minimum: 0
> +    maximum: 31
> +    description:
> +      The ID number for the PHY.
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  max-speed:
> +    enum:
> +      - 10
> +      - 100
> +      - 1000

This is outdated in the text description. Any valid speed is
supported, currently 10 - 200000, as listed in phy_setting settings().

   Andrew