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Message-ID: <fb78a687-9b01-de8b-b78a-9e62ddd3b9c0@linaro.org>
Date:   Thu, 6 Apr 2023 20:52:19 +0200
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Subject: Re: [PATCH v1 1/3] dt-binding: pci: add JH7110 PCIe dt-binding
 documents.
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To:     Conor Dooley <conor@kernel.org>
Cc:     Minda Chen <minda.chen@starfivetech.com>,
        Emil Renner Berthing <emil.renner.berthing@canonical.com>,
        Rob Herring <robh+dt@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= <kw@linux.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-pci@vger.kernel.org,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Mason Huo <mason.huo@starfivetech.com>,
        Leyfoon Tan <leyfoon.tan@starfivetech.com>,
        Kevin Xie <kevin.xie@starfivetech.com>
References: <20230406111142.74410-1-minda.chen@starfivetech.com>
 <20230406111142.74410-2-minda.chen@starfivetech.com>
 <38bc48bf-7d8c-8ddd-861f-3b7f3d2edce6@linaro.org>
 <20230406-revisit-patchy-a0063d964070@spud>
 <20230406-cinema-profile-1bfed00e4a5f@spud>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <20230406-cinema-profile-1bfed00e4a5f@spud>
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On 06/04/2023 20:45, Conor Dooley wrote:
> On Thu, Apr 06, 2023 at 07:35:09PM +0100, Conor Dooley wrote:
>> 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?
> 
> Further, if, as I currently suspect, there's a lot of commonality here,
> should the binding as well as the driver be split into common pdla bits
> and microchip/starfive specific ones?
> 
> Suppose that's more one for you Krzysztof.

Yeah, looks like only clocks and resets are different. At the end it
depends how much code you would remove...

Best regards,
Krzysztof