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

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Message-ID: <Z34r9D8htoDNvagK@hu-varada-blr.qualcomm.com>
Date: Wed, 8 Jan 2025 13:10:36 +0530
From: Varadarajan Narayanan <quic_varada@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
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 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
	     then:
	       properties:

Thanks
Varada