linux-kernel - Re: [PATCH v13 6/8] media: dt-bindings: wave5: add Chips&Media 521c codec IP support

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Date:   Thu, 26 Oct 2023 18:33:39 +0200
From:   Sebastian Fricke <sebastian.fricke@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Devarsh Thakkar <devarsht@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        NXP Linux Team <linux-imx@....com>,
        Conor Dooley <conor+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jackson Lee <jackson.lee@...psnmedia.com>,
        Hans Verkuil <hverkuil@...all.nl>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nas Chung <nas.chung@...psnmedia.com>,
        Fabio Estevam <festevam@...il.com>,
        linux-media@...r.kernel.org, Tomasz Figa <tfiga@...omium.org>,
        linux-kernel@...r.kernel.org,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        kernel@...labora.com, Robert Beckett <bob.beckett@...labora.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Darren Etheridge <detheridge@...com>,
        "Bajjuri, Praneeth" <praneeth@...com>,
        "Raghavendra, Vignesh" <vigneshr@...com>,
        "Bhatia, Aradhya" <a-bhatia1@...com>,
        "Luthra, Jai" <j-luthra@...com>,
        "Brnich, Brandon" <b-brnich@...com>,
        "Pothukuchi, Vijay" <vijayp@...com>
Subject: Re: [PATCH v13 6/8] media: dt-bindings: wave5: add Chips&Media 521c
 codec IP support

Hey Krzysztof,

On 22.10.2023 18:12, Krzysztof Kozlowski wrote:
>On 17/10/2023 15:39, Devarsh Thakkar wrote:
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - clocks
>>> +  - interrupts
>>> +
>>
>> Is it possible to keep interrupts property as optional given HW can still work
>> without it if SW does polling of ISR using registers?
>>
>> The reason to ask is in TI AM62A SoC (which also uses this codec) there is an
>> SoC errata of missing interrupt line to A53 and we are using SW based polling
>> locally to run the driver.
>>
>> We were planning to upstream that SW based polling support patch in CnM driver
>> once this base initial driver patch series gets merged, but just wanted to
>> check if upfront it is possible to have interrupts property as optional so
>> that we don't have to change the binding doc again to make it optional later on.
>>
>> Also note that the polling patch won't be specific to AM62A, other SoC's too
>> which use this wave5 hardware if they want can enable polling by choice (by
>> removing interrupt property)
>>
>> Could you please share your opinion on this ?
>
>You know, if you do not have interrupt line connected, how could it be
>required, right? If the hardware does not require interrupt to be
>connected then bindings should not require it.

Alright, so I will make the interrupt optional in the DT binding.
By simply removing it from this list:

required:
   - compatible
   - reg
   - clocks
   - interrupts

Is it possible to make it required later on for certain SoC by adding
something along the lines of:

allOf:
   - if:
       properties:
         compatible:
           contains:
             enum:
               - soc_compatible...
               ...
     then:
       properties:
         interrupts: true

?

>
>Best regards,
>Krzysztof

Sincerely,
Sebastian

>
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