linux-kernel - Re: [PATCH V3 1/2] dt-bindings: interrupt-controller: Add Loongson EIOINTC

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Date:   Wed, 19 Apr 2023 22:09:42 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Binbin Zhou <zhoubinbin@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        loongarch@...ts.linux.dev, devicetree@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH V3 1/2] dt-bindings: interrupt-controller: Add Loongson
 EIOINTC

On 19/04/2023 09:17, Binbin Zhou wrote:
> Add Loongson Extended I/O Interrupt controller binding with DT schema
> format using json-schema.
> 
> Signed-off-by: Binbin Zhou <zhoubinbin@...ngson.cn>
> ---
>  .../loongson,eiointc.yaml                     | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> new file mode 100644
> index 000000000000..4ab4efb061e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/loongson,eiointc.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/interrupt-controller/loongson,eiointc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Loongson Extended I/O Interrupt Controller
> +
> +maintainers:
> +  - Binbin Zhou <zhoubinbin@...ngson.cn>
> +
> +description: |
> +  This interrupt controller is found on the Loongson-3 family chips and
> +  Loongson-2K series chips and is used to distribute interrupts directly to
> +  individual cores without forwarding them through the HT's interrupt line.
> +
> +allOf:
> +  - $ref: /schemas/interrupt-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - loongson,ls2k0500-eiointc
> +      - loongson,ls2k2000-eiointc
> +
> +  reg:
> +    items:
> +      - description: Interrupt enable registers
> +      - description: Interrupt status registers
> +      - description: Interrupt clear registers
> +      - description: Interrupt routing configuration registers
> +
> +  reg-names:
> +    items:
> +      - const: enable
> +      - const: status
> +      - const: clear
> +      - const: route
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  interrupt-controller: true
> +
> +  '#interrupt-cells':
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-controller
> +  - '#interrupt-cells'
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    eiointc: interrupt-controller@...11600 {
> +      compatible = "loongson,ls2k0500-eiointc";
> +      reg = <0x1fe11600 0x10>,
> +            <0x1fe11700 0x10>,
> +            <0x1fe11800 0x10>,
> +            <0x1fe114c0 0x4>;

Binding is OK, but are you sure you want to split the address space like
this? It looks like two address spaces (enable+clear+status should be
one). Are you sure this is correct?

Best regards,
Krzysztof