linux-kernel - Re: [PATCH v3 1/2] dt-bindings: iio: adc: adding support for PAC193X

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Date:   Thu, 16 Nov 2023 21:00:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <conor@...nel.org>
Cc:     marius.cristea@...rochip.com, jic23@...nel.org, lars@...afoo.de,
        robh+dt@...nel.org, jdelvare@...e.com, linux@...ck-us.net,
        linux-hwmon@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: iio: adc: adding support for PAC193X

On 16/11/2023 19:21, Conor Dooley wrote:

>>> +allOf:
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          contains:
>>> +            const: interrupts
>>
>>
>> I don't understand what do you want to say here. I am also 100% sure you
>> did not test it on a real case (maybe example passes but nothing more).
> 
> As far as I understand, the same pin on the device is used for both an
> output or an input depending on the configuration. As an input, it is
> the "slow-io" control, and as an output it is an interrupt.
> I think Marius is trying to convey that either this pin can be in
> exclusively one state or another.
> 
> _However_ I am not sure that that is really the right thing to do - they
> might well be mutually exclusive modes, but I think the decision can be
> made at runtime, rather than at devicetree creation time. Say for
> example the GPIO controller this is connected to is capable of acting as
> an interrupt controller. Unless I am misunderstanding the runtime
> configurability of this hardware, I think it is possible to actually
> provide a "slow-io-gpios" and an interrupt property & let the operating
> system decide at runtime which mode it wants to work in.
> 
> I'm off travelling at the moment Marius, but I should be back in work on
> Monday if you want to have a chat about it & explain a bit more to me?

Sure, but which compatible contains "interrupts"?

Best regards,
Krzysztof