Hey Krzysztof,

On 22.10.2023 18:12, Krzysztof Kozlowski wrote:

On 17/10/2023 15:39, Devarsh Thakkar wrote:

quoted

quoted

+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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