linux-kernel - Re: [PATCH net-next 01/12] dt-bindings: dpll: add common dpll-pin-consumer schema

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Message-ID: <a5dad0f9-001c-468f-99bc-e24c23bc9b36@redhat.com>
Date: Fri, 16 Jan 2026 20:00:32 +0100
From: Ivan Vecera <ivecera@...hat.com>
To: Rob Herring <robh@...nel.org>
Cc: netdev@...r.kernel.org, Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Jiri Pirko <jiri@...nulli.us>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Prathosh Satish <Prathosh.Satish@...rochip.com>,
 Tony Nguyen <anthony.l.nguyen@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
 Jonathan Lemon <jonathan.lemon@...il.com>,
 Richard Cochran <richardcochran@...il.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 intel-wired-lan@...ts.osuosl.org, linux-rdma@...r.kernel.org,
 Michal Schmidt <mschmidt@...hat.com>, Petr Oros <poros@...hat.com>,
 Grzegorz Nitka <grzegorz.nitka@...el.com>
Subject: Re: [PATCH net-next 01/12] dt-bindings: dpll: add common
 dpll-pin-consumer schema

On 1/16/26 4:23 PM, Rob Herring wrote:
> On Thu, Jan 15, 2026 at 6:02 AM Ivan Vecera <ivecera@...hat.com> wrote:
>>
>> On 1/8/26 7:23 PM, Ivan Vecera wrote:
>>> Introduce a common schema for DPLL pin consumers. Devices such as Ethernet
>>> controllers and PHYs may require connections to DPLL pins for Synchronous
>>> Ethernet (SyncE) or other frequency synchronization tasks.
>>>
>>> Defining these properties in a shared schema ensures consistency across
>>> different device types that consume DPLL resources.
>>>
>>> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
>>> ---
>>>    .../bindings/dpll/dpll-pin-consumer.yaml      | 30 +++++++++++++++++++
>>>    MAINTAINERS                                   |  1 +
>>>    2 files changed, 31 insertions(+)
>>>    create mode 100644 Documentation/devicetree/bindings/dpll/dpll-pin-consumer.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/dpll/dpll-pin-consumer.yaml b/Documentation/devicetree/bindings/dpll/dpll-pin-consumer.yaml
>>> new file mode 100644
>>> index 0000000000000..60c184c18318a
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/dpll/dpll-pin-consumer.yaml
>>> @@ -0,0 +1,30 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/dpll/dpll-pin-consumer.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: DPLL Pin Consumer
>>> +
>>> +maintainers:
>>> +  - Ivan Vecera <ivecera@...hat.com>
>>> +
>>> +description: |
>>> +  Common properties for devices that require connection to DPLL (Digital Phase
>>> +  Locked Loop) pins for frequency synchronization (e.g. SyncE).
>>> +
>>> +properties:
>>> +  dpll-pins:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +    description:
>>> +      List of phandles to the DPLL pin nodes connected to this device.
>>> +
>>> +  dpll-pin-names:
>>> +    $ref: /schemas/types.yaml#/definitions/string-array
>>> +    description:
>>> +      Names for the DPLL pins defined in 'dpll-pins', in the same order.
>>> +
>>> +dependencies:
>>> +  dpll-pin-names: [ dpll-pins ]
>>> +
>>> +additionalProperties: true
>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>> index 765ad2daa2183..f6f58dfb20931 100644
>>> --- a/MAINTAINERS
>>> +++ b/MAINTAINERS
>>> @@ -7648,6 +7648,7 @@ M:      Jiri Pirko <jiri@...nulli.us>
>>>    L:  netdev@...r.kernel.org
>>>    S:  Supported
>>>    F:  Documentation/devicetree/bindings/dpll/dpll-device.yaml
>>> +F:   Documentation/devicetree/bindings/dpll/dpll-pin-consumer.yaml
>>>    F:  Documentation/devicetree/bindings/dpll/dpll-pin.yaml
>>>    F:  Documentation/driver-api/dpll.rst
>>>    F:  drivers/dpll/
>>
>> Based on private discussion with Andrew Lunn (thanks a lot), this is
>> wrong approach. Referencing directly dpll-pin nodes and using their
>> phandles in consumers is at least unusual.
>>
>> The right approach should be referencing dpll-device and use cells
>> to specify the dpll pin that is used.
> 
> You only need a cells property if you expect the number of cells to
> vary by provider.
> 
> However, the DPLL device just appears to be a clock provider and
> consumer, so why not just use the clock binding here? Also, there is
> no rule that using foo binding means you have to use foo subsystem in
> the kernel.

Hmm, do you mean something like this example?

&dpll0 {
     ...
     #clock-cells = <2>; /* 1st pin index, 2nd pin type (input/output) */

     input-pins {
         pin@2 {
             reg = <2>;
             ...
         };
         pin@4 {
             reg = <4>;
             ...
         };
     };
     output-pins {
         pin@3 {
             reg = <3>;
         };
     };
};
&phy0 {
     ...
     clock-names = "rclk0", "rclk1", "synce_ref";
     clocks = <&dpll0 2 DPLL_INPUT>,
              <&dpll0 4 DPLL_INPUT>,
              <&dpll0 3 DPLL_OUTPUT>;
     ...
};

And in this case the helpers in the patch 3 would use 'clock-names' &
'clocks' properties?

If so... Excuse, I submitted v2 of this patch-set prior to seeing your
email. Please be assured I did not intend to ignore your feedback.

Thanks,
Ivan