netdev - Re: [PATCH v1 8/8] dt-bindings: net: dsa: Add documentation for Hellcreek switches

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Message-ID: <87mu43ncaa.fsf@kurt>
Date:   Mon, 13 Jul 2020 08:45:33 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>,
        Kamil Alkhouri <kamil.alkhouri@...offenburg.de>,
        ilias.apalodimas@...aro.org, Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH v1 8/8] dt-bindings: net: dsa: Add documentation for Hellcreek switches

On Sat Jul 11 2020, Florian Fainelli wrote:
> On 7/10/2020 4:36 AM, Kurt Kanzenbach wrote:
>> Add basic documentation and example.
>> 
>> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
>> ---
>>  .../bindings/net/dsa/hellcreek.yaml           | 132 ++++++++++++++++++
>>  1 file changed, 132 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/net/dsa/hellcreek.yaml
>> 
>> diff --git a/Documentation/devicetree/bindings/net/dsa/hellcreek.yaml b/Documentation/devicetree/bindings/net/dsa/hellcreek.yaml
>> new file mode 100644
>> index 000000000000..bb8ccc1762c8
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/dsa/hellcreek.yaml
>> @@ -0,0 +1,132 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/net/dsa/hellcreek.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Hirschmann Hellcreek TSN Switch Device Tree Bindings
>> +
>> +allOf:
>> +  - $ref: dsa.yaml#
>> +
>> +maintainers:
>> +  - Andrew Lunn <andrew@...n.ch>
>> +  - Florian Fainelli <f.fainelli@...il.com>
>> +  - Vivien Didelot <vivien.didelot@...il.com>
>
> Don't you want to add yourself here as well?

Sure.

>
>> +
>> +description:
>> +  The Hellcreek TSN Switch IP is a 802.1Q Ethernet compliant switch. It supports
>> +  the Pricision Time Protocol, Hardware Timestamping as well the Time Aware

s/Pricision/Precision/g;

>> +  Shaper.
>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - const: hirschmann,hellcreek
>> +
>> +  reg:
>> +    description:
>> +      The physical base address and size of TSN and PTP memory base
>
> You need to indicate how many of these cells are required.

Yes.

>
>> +
>> +  reg-names:
>> +    description:
>> +      Names of the physical base addresses
>
> Likewise.
>
>> +
>> +  '#address-cells':
>> +    const: 1
>> +
>> +  '#size-cells':
>> +    const: 1
>
> Humm, not sure about those, you do not expose a memory mapped interface
> bus from this switch to another sub node.

True. That might be even different for other SoCs.

>
>> +
>> +  leds:
>> +    type: object
>> +    properties:
>> +      '#address-cells':
>> +        const: 1
>> +      '#size-cells':
>> +        const: 0
>> +
>> +    patternProperties:
>> +      "^led@[0-9]+$":
>> +          type: object
>> +          description: Hellcreek leds
>> +
>> +          properties:
>> +            reg:
>> +              items:
>> +                - enum: [0, 1]
>> +              description: Led number
>> +
>> +            label:
>> +              description: Label associated with this led
>> +              $ref: /schemas/types.yaml#/definitions/string
>> +
>> +            default-state:
>> +              items:
>> +                enum: ["on", "off", "keep"]
>> +              description: Default state for the led
>> +              $ref: /schemas/types.yaml#/definitions/string
>> +
>> +          required:
>> +            - reg
>
> Can you reference an existing LED binding by any chance?

Yes, we should reference leds/common.yaml somehow. Looking at
leds-gpio.yaml for example, it should be possible like this:

patternProperties:
  "^led@[0-9]+$":
      type: object
      description: Hellcreek leds

      $ref: ../../leds/common.yaml#

      [...]

But, how to express that only label and default-state should be used?

Thanks,
Kurt

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