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From:   Krishna chaitanya chundru <quic_krichai@quicinc.com>
Date:   Mon, 27 Nov 2023 17:43:49 +0530
Subject: [PATCH v3 1/3] dt-bindings: phy: qcom,qmp: Add PCIe
 qcom,refclk-always-on property
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Message-ID: <20231127-refclk_always_on-v3-1-26d969fa8f1d@quicinc.com>
References: <20231127-refclk_always_on-v3-0-26d969fa8f1d@quicinc.com>
In-Reply-To: <20231127-refclk_always_on-v3-0-26d969fa8f1d@quicinc.com>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Vinod Koul <vkoul@kernel.org>,
        Kishon Vijay Abraham I <kishon@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>
CC:     <linux-arm-msm@vger.kernel.org>, <linux-phy@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <quic_vbadigan@quicinc.com>, <quic_ramkri@quicinc.com>,
        <quic_nitegupt@quicinc.com>, <quic_skananth@quicinc.com>,
        <quic_vpernami@quicinc.com>, <quic_parass@quicinc.com>,
        "Krishna chaitanya chundru" <quic_krichai@quicinc.com>
Precedence: bulk

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