linux-kernel - Re: [PATCH v2] dt-bindings: interrupt-controller: Convert Atmel AIC to json-schema

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Date: Mon, 19 Feb 2024 15:30:52 +0000
From: <Dharma.B@...rochip.com>
To: <conor@...nel.org>
CC: <robh@...nel.org>, <tglx@...utronix.de>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] dt-bindings: interrupt-controller: Convert Atmel AIC
 to json-schema

Hi Rob and Conor,

On 14/02/24 12:43 am, Conor Dooley wrote:
> On Tue, Feb 13, 2024 at 04:23:36AM +0000,Dharma.B@...rochip.com  wrote:
>> On 12/02/24 7:38 pm, Rob Herring wrote:
>>> On Fri, Feb 09, 2024 at 03:31:22PM +0530, Dharma Balasubiramani wrote:
>>>> +  atmel,external-irqs:
>>>> +    $ref: /schemas/types.yaml#/definitions/uint32-array
>>>> +    description: u32 array of external irqs.
>>> Constraints on the array size and/or entry values?
>> The hardware's support for external IRQs may differ, which is why a u32
>> array is utilized. This choice is based on the fact that IRQ numbers are
>> commonly expressed as integers, and a 32-bit unsigned integer provides a
>> standardized size capable of representing a broad range of numbers. This
>> size is more than adequate for accommodating IRQ numbering.
> I don't think Rob was questioning your use of u32s, but rather the fact
> that you do not limit the values at all nor the number of values.

The peripheral identification defined at the product level corresponds 
to the interrupt source number.

SoC           External Interrupts    Peripheral ID
AT91RM9200    - IRQ0–IRQ6            25 - 31
SAMA5D2       - IRQ0–IRQn            49
SAMA5D3       - IRQ0–IRQn            47
SAMA5D4       - IRQ0–IRQn            56
SAM9x60       - IRQ0–IRQn            31

To reflect these constraints in bindings, I intend to make the following 
changes.

   atmel,external-irqs:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description: u32 array of external irqs.
     if:
       properties:
         compatible:
           contains:
             const: atmel,at91rm9200-aic
     then:
       minItems: 1
       maxItems: 7
     else:
       minItems: 1
       maxItems: 1


-- 
With Best Regards,
Dharma B.