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

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Message-ID: <56d66e0da56b33d668362e5701399499@walle.cc>
Date:   Fri, 02 Dec 2022 23:50:18 +0100
From:   Michael Walle <michael@...le.cc>
To:     Andrew Lunn <andrew@...n.ch>
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

Am 2022-12-02 19:31, schrieb Andrew Lunn:
> 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?

I agree. Let's wait what the device tree maintainers say.

-michael