linux-kernel - Re: [PATCH v7 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r axi variant

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Message-ID: <6162ea7d-40d6-4a21-96e5-7f851bc587dc@baylibre.com>
Date: Thu, 24 Oct 2024 09:43:02 -0500
From: David Lechner <dlechner@...libre.com>
To: Nuno Sá <noname.nuno@...il.com>,
 Angelo Dureghello <adureghello@...libre.com>, Conor Dooley <conor@...nel.org>
Cc: Nuno Sá <nuno.sa@...log.com>,
 Lars-Peter Clausen <lars@...afoo.de>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Olivier Moysan <olivier.moysan@...s.st.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v7 2/8] dt-bindings: iio: dac: adi-axi-dac: add ad3552r
 axi variant

On 10/24/24 7:37 AM, Nuno Sá wrote:
> On Thu, 2024-10-24 at 11:28 +0200, Angelo Dureghello wrote:
>> Hi Conor,
>>
>> On 22.10.2024 18:22, Conor Dooley wrote:
>>> On Mon, Oct 21, 2024 at 02:40:12PM +0200, Angelo Dureghello wrote:
>>>> From: Angelo Dureghello <adureghello@...libre.com>
>>>>
>>>> Add a new compatible and related bindigns for the fpga-based
>>>> "ad3552r" AXI IP core, a variant of the generic AXI DAC IP.
>>>>
>>>> The AXI "ad3552r" IP is a very similar HDL (fpga) variant of the
>>>> generic AXI "DAC" IP, intended to control ad3552r and similar chips,
>>>> mainly to reach high speed transfer rates using a QSPI DDR
>>>> (dobule-data-rate) interface.
>>>>
>>>> The ad3552r device is defined as a child of the AXI DAC, that in
>>>> this case is acting as an SPI controller.
>>>>
>>>> Note, #io-backend is present because it is possible (in theory anyway)
>>>> to use a separate controller for the control path than that used
>>>> for the datapath.
>>>>
>>>> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
>>>> ---
>>>>  .../devicetree/bindings/iio/dac/adi,axi-dac.yaml   | 69 +++++++++++++++++++++-
>>>>  1 file changed, 66 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
>>>> b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
>>>> index a55e9bfc66d7..0aabb210f26d 100644
>>>> --- a/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
>>>> +++ b/Documentation/devicetree/bindings/iio/dac/adi,axi-dac.yaml
>>>> @@ -19,11 +19,13 @@ description: |
>>>>    memory via DMA into the DAC.
>>>>  
>>>>    https://wiki.analog.com/resources/fpga/docs/axi_dac_ip
>>>> +  https://analogdevicesinc.github.io/hdl/library/axi_ad3552r/index.html
>>>>  
>>>>  properties:
>>>>    compatible:
>>>>      enum:
>>>>        - adi,axi-dac-9.1.b
>>>> +      - adi,axi-ad3552r
>>>>  
>>>>    reg:
>>>>      maxItems: 1
>>>> @@ -36,7 +38,12 @@ properties:
>>>>        - const: tx
>>>>  
>>>>    clocks:
>>>> -    maxItems: 1
>>>> +    minItems: 1
>>>> +    maxItems: 2
>>>> +
>>>> +  clock-names:
>>>> +    minItems: 1
>>>> +    maxItems: 2
>>>>  
>>>>    '#io-backend-cells':
>>>>      const: 0
>>>> @@ -47,7 +54,31 @@ required:
>>>>    - reg
>>>>    - clocks
>>>>  
>>>> -additionalProperties: false
>>>> +allOf:
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            const: adi,axi-ad3552r
>>>> +    then:
>>>> +      $ref: /schemas/spi/spi-controller.yaml#
>>>> +      properties:
>>>> +        clocks:
>>>> +          minItems: 2
>>>> +          maxItems: 2
>>>
>>> Is this maxItems required? It matches the outer maximum.
>>>
>>>> +        clock-names:
>>>> +          items:
>>>> +            - const: s_axi_aclk
>>>> +            - const: dac_clk
>>>
>>> The names are the same in both cases, you can move the definitions
>>> outside of the if/then/else stuff and only constrain it here.
>>>
>> thanks, could you maybe have a look if it's ok now ?
>> (maxItems not needed for a const list)
>>
>>   clocks:
>>     minItems: 1
>>     maxItems: 2
>>
>>   clock-names:
>>     items:
>>       - const: s_axi_aclk
>>       - const: dac_clk
>>     minItems: 1
>>
>>   '#io-backend-cells':
>>     const: 0
>>
>> required:
>>   - compatible
>>   - dmas
>>   - reg
>>   - clocks
>>
>> allOf:
>>   - if:
>>       properties:
>>         compatible:
>>           contains:
>>             const: adi,axi-ad3552r
>>     then:
>>       $ref: /schemas/spi/spi-controller.yaml#
>>       properties:
>>         clocks:
>>           minItems: 2
>>         clock-names:
>>           minItems: 2


For this one, I think we also need:

         required:
           - clock-names

>>     else:
>>       properties:
>>         clocks:
>>           maxItems: 1
>>         clock-names:
>>           maxItems: 1
> 
> I guess in this case it could even be clock-names: false. One does not make much
> sense.
> 
> - Nuno Sá
> 
>