linux-kernel - Re: [PATCH v1 1/5] dt-bindings: PCI: qcom-ep: Add support for SA8775P SoC

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Message-ID: <5bf1a4c5-6902-690e-78da-648ca957c5cf@quicinc.com>
Date:   Mon, 16 Oct 2023 09:54:23 +0530
From:   Mrinmay Sarkar <quic_msarkar@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     Shazad Hussain <quic_shazhuss@...cinc.com>,
        Rob Herring <robh@...nel.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <konrad.dybcio@...aro.org>,
        <mani@...nel.org>, <quic_nitegupt@...cinc.com>,
        <quic_ramkri@...cinc.com>, <quic_nayiluri@...cinc.com>,
        <quic_krichai@...cinc.com>, <quic_vbadigan@...cinc.com>,
        <quic_parass@...cinc.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, <linux-pci@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mhi@...ts.linux.dev>,
        <linux-phy@...ts.infradead.org>
Subject: Re: [PATCH v1 1/5] dt-bindings: PCI: qcom-ep: Add support for SA8775P
 SoC


On 10/13/2023 10:08 PM, Dmitry Baryshkov wrote:
> On Fri, 13 Oct 2023 at 15:55, Mrinmay Sarkar <quic_msarkar@...cinc.com> wrote:
>>
>> On 10/11/2023 5:13 PM, Dmitry Baryshkov wrote:
>>> On Wed, 11 Oct 2023 at 14:14, Mrinmay Sarkar <quic_msarkar@...cinc.com> wrote:
>>>> On 10/6/2023 4:24 PM, Shazad Hussain wrote:
>>>>> On 9/22/2023 12:08 AM, Rob Herring wrote:
>>>>>> On Wed, Sep 20, 2023 at 07:25:08PM +0530, Mrinmay Sarkar wrote:
>>>>>>> Add devicetree bindings support for SA8775P SoC.
>>>>>>> Define reg and interrupt per platform.
>>>>>>>
>>>>>>> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
>>>>>>> ---
>>>>>>>     .../devicetree/bindings/pci/qcom,pcie-ep.yaml      | 130
>>>>>>> +++++++++++++++++----
>>>>>>>     1 file changed, 108 insertions(+), 22 deletions(-)
>>>>>>>
>>>>>>> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
>>>>>>> b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
>>>>>>> index a223ce0..e860e8f 100644
>>>>>>> --- a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
>>>>>>> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml
>>>>>>> @@ -13,6 +13,7 @@ properties:
>>>>>>>       compatible:
>>>>>>>         oneOf:
>>>>>>>           - enum:
>>>>>>> +          - qcom,sa8775p-pcie-ep
>>>>>>>               - qcom,sdx55-pcie-ep
>>>>>>>               - qcom,sm8450-pcie-ep
>>>>>>>           - items:
>>>>>>> @@ -20,29 +21,19 @@ properties:
>>>>>>>               - const: qcom,sdx55-pcie-ep
>>>>>>>         reg:
>>>>>>> -    items:
>>>>>>> -      - description: Qualcomm-specific PARF configuration registers
>>>>>>> -      - description: DesignWare PCIe registers
>>>>>>> -      - description: External local bus interface registers
>>>>>>> -      - description: Address Translation Unit (ATU) registers
>>>>>>> -      - description: Memory region used to map remote RC address space
>>>>>>> -      - description: BAR memory region
>>>>>>> +    minItems: 6
>>>>>>> +    maxItems: 7
>>>>>>>         reg-names:
>>>>>>> -    items:
>>>>>>> -      - const: parf
>>>>>>> -      - const: dbi
>>>>>>> -      - const: elbi
>>>>>>> -      - const: atu
>>>>>>> -      - const: addr_space
>>>>>>> -      - const: mmio
>>>>>>> +    minItems: 6
>>>>>>> +    maxItems: 7
>>>>>> Don't move these into if/then schemas. Then we are duplicating the
>>>>>> names, and there is no reason to keep them aligned for new compatibles.
>>>>>>
>>>>>> Rob
>>>>> Hi Rob,
>>>>> As we have one extra reg property (dma) required for sa8775p-pcie-ep,
>>>>> isn't it expected to be moved in if/then as per number of regs
>>>>> required. Anyways we would have duplication of some properties for new
>>>>> compatibles where the member numbers differs for a property.
>>>>>
>>>>> Are you suggesting to add the extra reg property (dma) in the existing
>>>>> reg and reg-names list, and add minItems/maxItems for all compatibles
>>>>> present in this file ?
>>> This is what we have been doing in other cases: if the list is an
>>> extension of the current list, there is no need to duplicate it. One
>>> can use min/maxItems instead.
>> Hi Dmitry
>>
>> we have tried using min/maxItems rather than duplicating but somehow
>> catch up with some warnings in dt_bindings check
>>
>> //local/mnt/workspace/Mrinmay/lemans/next-20230914/linux-next/out/Documentation/devicetree/bindings/pci/qcom,pcie-ep.example.dtb:
>> pcie-ep@...0000: reg: [[29360128, 12288], [1073741824, 3869],
>> [1073745696, 200], [1073745920, 4096], [1073750016, 4096], [29372416,
>> 12288]] is too short//
>> //        from schema $id:
>> http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
>> ///local/mnt/workspace/Mrinmay/lemans/next-20230914/linux-next/out/Documentation/devicetree/bindings/pci/qcom,pcie-ep.example.dtb:
>> pcie-ep@...0000: reg-names: ['parf', 'dbi', 'elbi', 'atu', 'addr_space',
>> 'mmio'] is too short//
>> //        from schema $id:
> missing min/maxItems for reg and reg-names
>
>> http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
>> ///local/mnt/workspace/Mrinmay/lemans/next-20230914/linux-next/out/Documentation/devicetree/bindings/pci/qcom,pcie-ep.example.dtb:
>> pcie-ep@...0000: interrupts: [[0, 140, 4], [0, 145, 4]] is too short//
>> //        from schema $id:
>> http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
>> ///local/mnt/workspace/Mrinmay/lemans/next-20230914/linux-next/out/Documentation/devicetree/bindings/pci/qcom,pcie-ep.example.dtb:
>> pcie-ep@...0000: interrupt-names: ['global', 'doorbell'] is too short//
>> //        from schema $id:
>> http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml#//
> incorrect min/maxItems for interrupts.
I am getting the same warnings even after correcting the min/maxItems 
for interrupt.
> -Mrinmay
>> //local/mnt/workspace/Mrinmay/lemans/next-20230914/linux-next/out/Documentation/devicetree/bindings/pci/qcom,pcie-ep.example.dtb:
>> pcie-ep@...0000: interrupt-names: ['global', 'doorbell'] is too short/
>>
>> added the patch in attachment.
>>
>> --Mrinmay
>>
>>>>> -Shazad
>>>> Here we have defined reg and interrupt per platform as clocks is defined.
>>>>
>>>> -Mrinmay
>>>>
>
>