linux-kernel - Re: [PATCH v1 1/3] dt-binding: pci: add JH7110 PCIe dt-binding documents.

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Date:   Thu, 6 Apr 2023 19:35:03 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Minda Chen <minda.chen@...rfivetech.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-pci@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mason Huo <mason.huo@...rfivetech.com>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        Kevin Xie <kevin.xie@...rfivetech.com>
Subject: Re: [PATCH v1 1/3] dt-binding: pci: add JH7110 PCIe dt-binding
 documents.

On Thu, Apr 06, 2023 at 08:24:55PM +0200, Krzysztof Kozlowski wrote:
> On 06/04/2023 13:11, Minda Chen wrote:
> > +
> > +  interrupt-controller:
> > +    type: object
> > +    properties:
> > +      '#address-cells':
> > +        const: 0
> > +
> > +      '#interrupt-cells':
> > +        const: 1
> > +
> > +      interrupt-controller: true
> > +
> > +    required:
> > +      - '#address-cells'
> > +      - '#interrupt-cells'
> > +      - interrupt-controller
> > +
> > +    additionalProperties: false
> > +
> > +required:
> > +  - reg
> > +  - reg-names
> > +  - "#interrupt-cells"
> 
> Keep consistent quotes - either ' or "
> 
> Are you sure this is correct? You have interrupt controller as child node.

I know existing stuff in-tree is far from a guarantee that it'll be
right, but this does at least follow what we've got for PolarFire SoC:
Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml

Both PLDA and both RISC-V w/ a PLIC as the interrupt controller, so in
similar waters.
This note existed in the original text form binding of the Microchip
PCI controller:
| +NOTE:
| +The core provides a single interrupt for both INTx/MSI messages. So,
| +create an interrupt controller node to support 'interrupt-map' DT
| +functionality.  The driver will create an IRQ domain for this map, decode
| +the four INTx interrupts in ISR and route them to this domain.

Given the similarities, I figure the same requirement applies here too.
Minda?

Cheers,
Conor.

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