netdev - Re: [PATCH net-next v1 3/4] dt-bindings: net: phy: add MaxLinear GPY2xx bindings

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Message-ID: <Y4pEhjDOGmpmj/Kk@lunn.ch>
Date:   Fri, 2 Dec 2022 19:31:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     Xu Liang <lxu@...linear.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v1 3/4] dt-bindings: net: phy: add MaxLinear
 GPY2xx bindings

On Fri, Dec 02, 2022 at 04:12:03PM +0100, Michael Walle wrote:
> Add the device tree bindings for the MaxLinear GPY2xx PHYs.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> 
> Is the filename ok? I was unsure because that flag is only for the GPY215
> for now. But it might also apply to others. Also there is no compatible
> string, so..
> 
>  .../bindings/net/maxlinear,gpy2xx.yaml        | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/maxlinear,gpy2xx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/maxlinear,gpy2xx.yaml b/Documentation/devicetree/bindings/net/maxlinear,gpy2xx.yaml
> new file mode 100644
> index 000000000000..d71fa9de2b64
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/maxlinear,gpy2xx.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/maxlinear,gpy2xx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MaxLinear GPY2xx PHY
> +
> +maintainers:
> +  - Andrew Lunn <andrew@...n.ch>
> +  - Michael Walle <michael@...le.cc>
> +
> +allOf:
> +  - $ref: ethernet-phy.yaml#
> +
> +properties:
> +  maxlinear,use-broken-interrupts:
> +    description: |
> +      Interrupts are broken on some GPY2xx PHYs in that they keep the
> +      interrupt line asserted even after the interrupt status register is
> +      cleared. Thus it is blocking the interrupt line which is usually bad
> +      for shared lines. By default interrupts are disabled for this PHY and
> +      polling mode is used. If one can live with the consequences, this
> +      property can be used to enable interrupt handling.
> +
> +      Affected PHYs (as far as known) are GPY215B and GPY215C.
> +    type: boolean
> +
> +dependencies:
> +  maxlinear,use-broken-interrupts: [ interrupts ]
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    ethernet {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        ethernet-phy@0 {
> +            reg = <0>;
> +            interrupts-extended = <&intc 0>;
> +            maxlinear,use-broken-interrupts;
> +        };
> +    };

I'm wondering if we want this in the example. We probably don't want
people to use this property by accident, i.e. copy/paste without
reading the rest of the document. This will becomes a bigger problem
if more properties are added, RGMII delays etc.

So maybe just skip the example?

   Andrew