Re: [PATCH v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe qcom,refclk-always-on property
From: Krishna Chaitanya Chundru
Date: Tue Nov 28 2023 - 04:19:40 EST
On 11/28/2023 2:26 PM, Krzysztof Kozlowski wrote:
On 27/11/2023 13:13, Krishna chaitanya chundru wrote:
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@xxxxxxxxxxx>
---
.../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
You received a comment to use proper wrapping: 80. Please implement it.
I will update this.
+ 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.
The property name suggests that's the state of hardware - refclk is
always on. Description suggests you want to instruct OS to do something.
Again, third time (once from Bjorn, once from Dmitry), rephrase property
name and description to describe the hardware issue. I see description
improved, but not the property name. Again in the end of description you
Both bjorn and Dmitry gave comments to change the description only, and
not the property name,
correct if I am wrong.
say what Linux should do. Bindings do not describe Linux OS.
I will remove the last line in the next patch.
- Krishna Chaitanya.
Best regards,
Krzysztof