linux-kernel - [PATCH] dt-bindings: PCI: qcom: Allow 'dma-coherent' property

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Message-Id: <20221205094530.12883-1-johan+linaro@kernel.org>
Date:   Mon,  5 Dec 2022 10:45:30 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH] dt-bindings: PCI: qcom: Allow 'dma-coherent' property

Devices on some PCIe buses may be cache coherent and must be marked as
such in the devicetree to avoid data corruption.

This is specifically needed on recent Qualcomm platforms like SC8280XP.

Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---

Lorenzo, the corresponding SC8280XP DT fix is heading for 6.2 so it
would be nice if this one could be merged for 6.2-rc1 (or -rc2) as well
to avoid the corresponding DT validation warnings.

Johan


 Documentation/devicetree/bindings/pci/qcom,pcie.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
index 2f851c804bb0..a5859bb3dc28 100644
--- a/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.yaml
@@ -62,6 +62,8 @@ properties:
     minItems: 3
     maxItems: 13
 
+  dma-coherent: true
+
   interconnects:
     maxItems: 2
 
-- 
2.37.4