linux-kernel - Re: [PATCH v3] dt-bindings: interrupt-controller: Convert Atmel AIC to json-schema

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Message-ID: <20240222-stiffly-squeeze-b4ec2b49a4fe@spud>
Date: Thu, 22 Feb 2024 08:56:13 +0000
From: Conor Dooley <conor@...nel.org>
To: Dharma Balasubiramani <dharma.b@...rochip.com>
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,
	Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v3] dt-bindings: interrupt-controller: Convert Atmel AIC
 to json-schema

> diff --git a/Documentation/devicetree/bindings/interrupt-controller/atmel,aic.yaml b/Documentation/devicetree/bindings/interrupt-controller/atmel,aic.yaml
> new file mode 100644
> index 000000000000..0d51bd78bf2b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/atmel,aic.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/atmel,aic.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Advanced Interrupt Controller (AIC)
> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +  - Dharma balasubiramani <dharma.b@...rochip.com>
> +
> +description:
> +  The Advanced Interrupt Controller (AIC) is an 8-level priority, individually
> +  maskable, vectored interrupt controller providing handling of up to one
> +  hundred and twenty-eight interrupt sources.
> +

> +allOf:
> +  - $ref: /schemas/interrupt-controller.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: atmel,at91rm9200-aic
> +    then:
> +      properties:
> +        atmel,external-irqs:
> +          minItems: 1
> +          maxItems: 7
> +    else:
> +      properties:
> +        atmel,external-irqs:
> +          minItems: 1
> +          maxItems: 1

When there's property restrictions being applied, move the allof down
to...

> +
> +properties:
> +  compatible:
> +    enum:
> +      - atmel,at91rm9200-aic
> +      - atmel,sama5d2-aic
> +      - atmel,sama5d3-aic
> +      - atmel,sama5d4-aic
> +      - microchip,sam9x60-aic
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  "#interrupt-cells":
> +    const: 3
> +    description: |
> +      The 1st cell is the IRQ number (Peripheral IDentifier on datasheet).
> +      The 2nd cell specifies flags:
> +        bits[3:0] trigger type and level flags:
> +          1 = low-to-high edge triggered.
> +          2 = high-to-low edge triggered.
> +          4 = active high level-sensitive.
> +          8 = active low level-sensitive.
> +        Valid combinations: 1, 2, 3, 4, 8.
> +        Default for internal sources: 4 (active high).
> +      The 3rd cell specifies irq priority from 0 (lowest) to 7 (highest).
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  atmel,external-irqs:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: u32 array of external irqs.

...here. Both work, but seeing the restrictions before you see any of
the properties is not the most understandable.

Cheers,
Conor.

> +required:
> +  - compatible
> +  - reg
> +  - interrupt-controller
> +  - "#interrupt-cells"
> +  - atmel,external-irqs
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    interrupt-controller@...ff000 {
> +      compatible = "atmel,at91rm9200-aic";
> +      reg = <0xfffff000 0x200>;
> +      interrupt-controller;
> +      #interrupt-cells = <3>;
> +      atmel,external-irqs = <31>;
> +    };
> +...
> 
> base-commit: 4f5e5092fdbf5cec6bedc19fbe69cce4f5f08372
> -- 
> 2.25.1
> 

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