linux-kernel - [PATCH v1 1/2] dt-bindings: PCI: dwc: Add snps,skip-wait-link-up

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Date:   Fri, 24 Feb 2023 13:57:46 -0600
From:   Sajid Dalvi <sdalvi@...gle.com>
To:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Krzysztof Wilczyński" <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Sajid Dalvi <sdalvi@...gle.com>, kernel-team@...roid.com,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] dt-bindings: PCI: dwc: Add snps,skip-wait-link-up

When the Root Complex is probed, the default behavior is to spin in a loop
waiting for the link to come up. In some systems the link is not brought up
during probe, but later in the context of an end-point turning on.
This property will allow the loop to be skipped.

Signed-off-by: Sajid Dalvi <sdalvi@...gle.com>
---
 Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
index 1a83f0f65f19..0b8950a73b7e 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
@@ -197,6 +197,14 @@ properties:
       - contains:
           const: msi
 
+  snps,skip-wait-link-up:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      When the Root Complex is probed, the default behavior is to spin in a
+      loop waiting for the link to come up. In some systems the link is not
+      brought up during probe, but later in the context of an end-point turning
+      on. This property will allow the loop to be skipped.
+
 additionalProperties: true
 
 required:
-- 
2.39.2.637.g21b0678d19-goog