linux-kernel - Re: [PATCH v5 3/5] dt-bindings: PCI: qcom: Document the IPQ5332 PCIe controller

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Message-ID: <9cf60fb9-c4ab-49f0-bb48-102333fe411e@kernel.org>
Date: Wed, 8 Jan 2025 11:10:55 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Varadarajan Narayanan <quic_varada@...cinc.com>
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com,
 manivannan.sadhasivam@...aro.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, vkoul@...nel.org, kishon@...nel.org,
 andersson@...nel.org, konradybcio@...nel.org, p.zabel@...gutronix.de,
 quic_nsekar@...cinc.com, dmitry.baryshkov@...aro.org,
 linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-phy@...ts.infradead.org
Subject: Re: [PATCH v5 3/5] dt-bindings: PCI: qcom: Document the IPQ5332 PCIe
 controller

On 08/01/2025 08:40, Varadarajan Narayanan wrote:
> On Wed, Jan 08, 2025 at 08:19:19AM +0100, Krzysztof Kozlowski wrote:
>> On 07/01/2025 12:05, Varadarajan Narayanan wrote:
>>>>> ---
>>>>>  Documentation/devicetree/bindings/pci/qcom,pcie.yaml | 10 ++++++++--
>>>>>  1 file changed, 8 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>>>>> index bd87f6b49d68..9f37eca1ce0d 100644
>>>>> --- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>>>>> +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
>>>>> @@ -26,7 +26,6 @@ properties:
>>>>>            - qcom,pcie-ipq8064-v2
>>>>>            - qcom,pcie-ipq8074
>>>>>            - qcom,pcie-ipq8074-gen3
>>>>> -          - qcom,pcie-ipq9574
>>>>
>>>> I don't understand this change at all and your commit msg explains
>>>> here nothing.
>>>
>>> All DT entries except "reg" is similar between ipq5332 and
>>> ipq9574. ipq9574 has 5 registers while ipq5332 has 6. MHI is the
>>> additional (i.e. sixth) entry for ipq5332.
>>>
>>> If ipq9574 is not removed from here, dt_binding_check gives the
>>> following errors
>>>
>>> 1.	/local/mnt/workspace/varada/upstream/pci-v6/arch/arm64/boot/dts/qcom/ipq5332-rdp474.dtb: pcie@...00000: reg: [[557056, 12288], [402653184, 3869], [402657056, 168], [402657280, 4096], [403701760, 4096], [569344, 4096]] is too long
>>>
>>> 	Failed validating 'maxItems' in schema['allOf'][2]['then']['properties']['reg']:
>>> 	    {'maxItems': 5, 'minItems': 5}
>>>
>>> 2.	/local/mnt/workspace/varada/upstream/pci-v6/arch/arm64/boot/dts/qcom/ipq5332-rdp474.dtb: pcie@...00000: reg-names: ['parf', 'dbi', 'elbi', 'atu', 'config', 'mhi'] is too long
>>>
>>> 	Failed validating 'maxItems' in schema['allOf'][2]['then']['properties']['reg-names']:
>>> 	    {'items': [{'const': 'dbi'},
>>> 		       {'const': 'elbi'},
>>> 		       {'const': 'atu'},
>>> 		       {'const': 'parf'},
>>> 		       {'const': 'config'}],
>>> 	     'maxItems': 5,
>>> 	     'minItems': 5,
>>> 	     'type': 'array'}
>>>
>>> Hence had to remove it from here and add it to the sdx55 reg
>>> definition.
>>
>> So you entirely dropped constrain for regs. No. This has to be fixed,
>> not dropped.
> 
> ipq9574 is not dropped entirely. It is clubbed with sdx55's
> constraints. Please see this
> 
> 	@@ -206,6 +208,8 @@ allOf:
> 		 compatible:
> 		   contains:
> 		     enum:
> 	+              - qcom,pcie-ipq5332
> 	+              - qcom,pcie-ipq9574
> 		       - qcom,pcie-sdx55
Correct, not dropped entirely, but now it receives mhi for no reason.
This should be separate commit with its own explanation - why ipq9574
has now MHI address space.

Best regards,
Krzysztof