[PATCH v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property

Krishna chaitanya chundru
2023-11-27T12:14:42Z

Document qcom,refclk-always-on property which is needed in some platforms
to supply refclk even in PCIe low power states.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
---
.../devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
index 2c3d6553a7ba..c747c9f35795 100644
--- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml
@@ -93,6 +93,13 @@ properties:
"#phy-cells":
const: 0

+ qcom,refclk-always-on:
+ type: boolean
+ description: In some platform where PCIe switch is connected, pcie switch due to some design
+ limitation fails to propage clkreq signal to the host and due to that host will not send
+ refclk, which results in linkdown in L1.2 or L1.1 exit initiated by EP.
+ This property if set keeps refclk always on even in Low power states.
+
required:
- compatible
- reg

--
2.42.0