On 07/05/2025 11:56, Qiang Yu wrote:

On 5/7/2025 4:25 PM, Krzysztof Kozlowski wrote:

quoted

On 07/05/2025 10:19, Ziyue Zhang wrote:

quoted

On 5/7/2025 1:10 PM, Krzysztof Kozlowski wrote:

quoted

On Wed, May 07, 2025 at 11:10:15AM GMT, Ziyue Zhang wrote:

quoted

Add compatible for qcs8300 platform, with sa8775p as the fallback.

Signed-off-by: Ziyue Zhang <redacted>
---
   .../bindings/pci/qcom,pcie-sa8775p.yaml       | 26 ++++++++++++++-----
   1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml
index efde49d1bef8..154bb60be402 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie-sa8775p.yaml

@@ -16,7 +16,12 @@ description:
   
   properties:
     compatible:
-    const: qcom,pcie-sa8775p
+    oneOf:
+      - const: qcom,pcie-sa8775p
+      - items:
+          - enum:
+              - qcom,pcie-qcs8300
+          - const: qcom,pcie-sa8775p
   
     reg:
       minItems: 6

@@ -45,7 +50,7 @@ properties:
   
     interrupts:
       minItems: 8
-    maxItems: 8
+    maxItems: 9

I don't understand why this is flexible for sa8775p. I assume this
wasn't tested or finished, just like your previous patch suggested.

Please send complete bindings once you finish them or explain what
exactly changed in the meantime.

Best regards,
Krzysztof

Hi Krzysztof
Global interrupt is optional in the PCIe driver. It is not present in
the SA8775p PCIe device tree node, but it is required for the QCS8300

And hardware?

The PCIe controller on the SA8775p is also capable of generating a global
interrupt.

quoted

quoted

I did the DTBs and yaml checks before pushing this patch. This is how
I became aware that `maxItem` needed to be changed to 9.

If it is required for QCS8300, then you are supposed to make it required
in the binding for this device. Look at other bindings.

The global interrupt is not mandatory. The PCIe driver can still function
without this interrupt, but it will offer a better user experience when
the device is plugged in or removed. On other platforms, the global
interrupt is also optional, and `minItems` and `maxItems` are set to 8 and
9 respectively. Please refer to `qcom,pcie - sm8550.yaml`,
`qcom,pcie - sm8450.yaml`, and `qcom,pcie - x1e80100.yaml`.

I don't know what does it prove. You cannot add requirement of global
interrupt to existing devices because it would be an ABI break.

Best regards,
Krzysztof

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