linux-kernel - [PATCH v4 1/2] dt-bindings: pci: Retrain Link to work around Gen2 training defect.

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Date:   Fri, 11 Dec 2020 15:42:35 +0100
From:   Nadeem Athani <nadeem@...ence.com>
To:     <tjoseph@...ence.com>, <lorenzo.pieralisi@....com>,
        <robh@...nel.org>, <bhelgaas@...gle.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kishon@...com>, <devicetree@...r.kernel.org>
CC:     <nadeem@...ence.com>, <mparab@...ence.com>, <sjakhade@...ence.com>,
        <pthombar@...ence.com>
Subject: [PATCH v4 1/2] dt-bindings: pci: Retrain Link to work around Gen2 training defect.

Cadence controller will not initiate autonomous speed change if strapped as
Gen2. The Retrain Link bit is set as quirk to enable this speed change.
Adding a quirk flag based on a new compatible string.

Signed-off-by: Nadeem Athani <nadeem@...ence.com>
---
 Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
index 293b8ec318bc..204d78f9efe3 100644
--- a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
@@ -15,7 +15,9 @@ allOf:
 
 properties:
   compatible:
-    const: cdns,cdns-pcie-host
+    enum:
+        - cdns,cdns-pcie-host
+        - cdns,cdns-pcie-host-quirk-retrain
 
   reg:
     maxItems: 2
-- 
2.15.0