linux-kernel - Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: fsl,ls-extirq: convert to YAML

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Message-ID: <83b596d0570c779c61c3c37c6f512679@walle.cc>
Date:   Mon, 25 Apr 2022 23:58:39 +0200
From:   Michael Walle <michael@...le.cc>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: fsl,ls-extirq:
 convert to YAML

Am 2022-04-25 20:36, schrieb Krzysztof Kozlowski:
> On 25/04/2022 16:02, Michael Walle wrote:
>> Convert the fsl,ls-extirq binding to the new YAML format.
>> 
> 
> (...)
> 
>> diff --git 
>> a/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.yaml 
>> b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.yaml
>> new file mode 100644
>> index 000000000000..39d120ad7549
>> --- /dev/null
>> +++ 
>> b/Documentation/devicetree/bindings/interrupt-controller/fsl,ls-extirq.yaml
>> @@ -0,0 +1,88 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: 
>> http://devicetree.org/schemas/interrupt-controller/fsl,ls-extirq.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Freescale Layerscape External Interrupt Controller
>> +
>> +maintainers:
>> +  - Shawn Guo <shawnguo@...nel.org>
>> +  - Li Yang <leoyang.li@....com>
>> +
>> +description: |
>> +  Some Layerscape SOCs (LS1021A, LS1043A, LS1046A LS1088A, LS208xA,
>> +  LX216xA) support inverting the polarity of certain external 
>> interrupt
>> +  lines.
>> +
>> +allOf:
>> +  - $ref: /schemas/interrupt-controller.yaml#
> 
> I have doubts whether this is here applicable. See also Rob's comment:
> https://lore.kernel.org/all/YjjJpxLWJ%2FYOe0OX@robh.at.kernel.org/
> 
> This device does not have children, so the interrupt-controller schema
> should be probably skipped.

ok.

>> +
>> +properties:
>> +  compatible:
>> +    oneOf:
>> +      - enum:
>> +          - fsl,ls1021a-extirq
>> +          - fsl,ls1043a-extirq
>> +          - fsl,ls1088a-extirq
>> +      - items:
>> +          - enum:
>> +              - fsl,ls1046a-extirq
>> +          - const: fsl,ls1043a-extirq
>> +      - items:
>> +          - enum:
>> +              - fsl,ls2080a-extirq
>> +              - fsl,lx2160a-extirq
>> +          - const: fsl,ls1088a-extirq
>> +
>> +  '#interrupt-cells':
>> +    const: 2
>> +
>> +  '#address-cells':
>> +    const: 0
>> +
>> +  interrupt-controller: true
>> +
>> +  reg:
>> +    maxItems: 1
>> +    description:
>> +      Specifies the Interrupt Polarity Control Register (INTPCR) in 
>> the
>> +      SCFG or the External Interrupt Control Register (IRQCR) in the 
>> ISC.
>> +
>> +  interrupt-map:

btw.

minItems: 12
maxItems: 12

Isn't working here, is that expected? The validator seem to get the 
count
of the elements of one tuple wrong.

I.e.
arch/arm64/boot/dts/freescale/fsl-ls2080a-rdb.dtb: 
interrupt-controller@14: interrupt-map: [[0, 0, 1, 0, 0, 4, 1, 0], [1, 
0, 1, 4, 2, 0, 1, 0], [2, 4, 3, 0, 1, 0, 3, 4], [4, 0, 1, 0, 4, 4, 5, 
0], [1, 0, 5, 4, 6, 0, 1, 0], [6, 4, 7, 0, 1, 0, 7, 4], [8, 0, 1, 0, 8, 
4, 9, 0], [1, 0, 9, 4, 10, 0, 1, 0], [10, 4, 11, 0, 1, 0, 11, 4]] is too 
short

>> +    description: Specifies the mapping from external interrupts to 
>> GIC interrupts.
>> +
>> +  interrupt-map-mask:
>> +    items:
>> +      - const: 0xffffffff
> 
> This looks highly permissive mask and should be instead defined per
> variant, for example (quickly looking at DTS):
> 0x7 for ls1021
> 0xf for ls1043a and ls1088a

Just that I understand it correctly, the result of the AND with that
mask is then looked up in the interrupt-map (the first entry there)?

> You might need to correct the DTS. Some confirmation from someone with
> datasheet would be good.

According to their datasheets they have the following number of external
IRQs:
- ls1021a has 6,
- ls1043a has 12,
- ls1046a has 12,
- ls1088a has 12,
- ls2080a has 12,
- lx2160a has 12.

That is what I need to confirm, right?

Is there a better way than the following snippet:

properties:
   interrupt-map-mask: true

allOf:
   - if:
       properties:
         compatible:
           contains:
             enum:
               - fsl,ls1021a-extirq
     then:
       properties:
         interrupt-map-mask:
           items:
             - const: 0x7
             - const: 0
   - if:
       properties:
         compatible:
           contains:
             enum:
               - fsl,ls1043a-extirq
               - fsl,ls1046a-extirq
               - fsl,ls1088a-extirq
               - fsl,ls2080a-extirq
               - fsl,lx2160a-extirq
     then:
       properties:
         interrupt-map-mask:
           items:
             - const: 0xf
             - const: 0

-michael