linux-kernel - Re: [PATCH v2 1/6] dt-bindings: interrupt-controller: Add support for Realtek DHC SoCs

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Date:   Sun, 3 Dec 2023 17:32:42 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     James Tai [戴志峰] <james.tai@...ltek.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 1/6] dt-bindings: interrupt-controller: Add support for
 Realtek DHC SoCs

On 03/12/2023 16:56, James Tai [戴志峰] wrote:
>>>>>> +  interrupts-extended:
>>>>>
>>>>> interrupts instead.
>>>>>
>>>>> Anyway, you must describe the items. Why this is not fixed but flexible?
>>>>> Hardware has different number of pins? That's unlikely.
>>>>>
>>>> I will replace it with 'interrupts'. Since our Interrupt controller
>>>> architecture doesn't involve multiple interrupt sources, using 'interrupts'
>> should suffice.
>>>>
>>>
>>> Due to changes in hardware design, some peripheral interrupts pin initially
>> connected to the Realtek interrupt controller were redirected to the GIC.
>>> However, the associated fields and statuses in the Realtek interrupt controller
>> registers were not removed.
>>> As a result, these interrupts cannot be cleared by peripheral register, and their
>> status clearing is still needing the Realtek interrupt controller driver to manage.
>>>
>>> That's why flexibility is necessary.
>>
>> This does not explain why this is not fixed per variant.
>>
> 
> Does the definition of "fixed" you mentioned refer to fixed interrupt pins? If not, could you please give me an example and let me know what you mean by "fixed"?

Number of the interrupts per each device or variant should be strictly
defined, not variable.

Please wrap your emails according to mail netiquette.

Best regards,
Krzysztof