linux-kernel - [PATCH v4 04/17] dt-bindings: PCI: dwc: Add max-link-speed common property

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Message-ID: <20220728143427.13617-5-Sergey.Semin@baikalelectronics.ru>
Date:   Thu, 28 Jul 2022 17:34:14 +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 04/17] dt-bindings: PCI: dwc: Add max-link-speed common property

In accordance with [1] DW PCIe controllers support up to Gen5 link speed.
Let's add the max-link-speed property upper bound to 5 then. The DT
bindings of the particular devices are expected to setup more strict
constraint on that parameter.

[1] Synopsys DesignWare Cores PCI Express Controller Databook, Version
5.40a, March 2019, p. 27

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

---

Changelog v3:
- This is a new patch unpinned from the next one:
  https://lore.kernel.org/linux-pci/20220503214638.1895-2-Sergey.Semin@baikalelectronics.ru/
  by the Rob' request. (@Rob)
---
 Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml | 3 +++
 Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml     | 2 ++
 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml        | 1 +
 3 files changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
index 627a5d6625ba..b2fbe886981b 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml
@@ -45,6 +45,9 @@ properties:
       the peripheral devices available on the PCIe bus.
     maxItems: 1
 
+  max-link-speed:
+    maximum: 5
+
   num-lanes:
     description:
       Number of PCIe link lanes to use. Can be omitted should the already
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
index dcd521aed213..fc3b5d4ac245 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-ep.yaml
@@ -55,4 +55,6 @@ examples:
 
       phys = <&pcie_phy0>, <&pcie_phy1>, <&pcie_phy2>, <&pcie_phy3>;
       phy-names = "pcie0", "pcie1", "pcie2", "pcie3";
+
+      max-link-speed = <3>;
     };
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
index 4a5c8b933b52..01cedf51e0f8 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
@@ -74,4 +74,5 @@ examples:
       phy-names = "pcie";
 
       num-lanes = <1>;
+      max-link-speed = <3>;
     };
-- 
2.35.1