linux-kernel - [PATCH v4 10/17] dt-bindings: PCI: dwc: Add dma-coherent property

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Message-ID: <20220728143427.13617-11-Sergey.Semin@baikalelectronics.ru>
Date:   Thu, 28 Jul 2022 17:34:20 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh+dt@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 10/17] dt-bindings: PCI: dwc: Add dma-coherent property

DW PCIe EP/RP AXI- and TRGT1-master interfaces are responsible for the
application memory access. They are used by the RP/EP PCIe buses (MWr/MWr
TLPs emitted by the peripheral PCIe devices) and the eDMA block. Since all
of them mainly involve the system memory and basically mean DMA we can
expect the corresponding platforms can be designed in a way to make sure
the transactions are cache-coherent. As such the DW PCIe DT-nodes can have
the 'dma-coherent' property specified. Let's permit it in the DT-bindings
then.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

---

Changelog v3:
- This is a new patch created on v3 lap of the series.
---
 Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
index f22fb01c9bd0..517f84d30198 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
@@ -160,6 +160,8 @@ properties:
       configuration space registers, Port Logic registers, DMA and iATU
       registers. This feature has been available since DWC PCIe v4.80a.
 
+  dma-coherent: true
+
 additionalProperties: true
 
 definitions:
-- 
2.35.1