linux-kernel - [PATCH 3/3] dt-bindings: ufs: qcom: Document HS gear and rate limit properties

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Message-ID: <20250722161103.3938-4-quic_rdwivedi@quicinc.com>
Date: Tue, 22 Jul 2025 21:41:03 +0530
From: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
To: <mani@...nel.org>, <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <bvanassche@....org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <andersson@...nel.org>,
        <konradybcio@...nel.org>, <James.Bottomley@...senPartnership.com>,
        <martin.petersen@...cle.com>, <agross@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/3] dt-bindings: ufs: qcom: Document HS gear and rate limit properties

Add documentation for two new optional properties:
  - limit-hs-gear
  - limit-rate

These properties allow platforms to restrict the maximum high-speed
gear and rate used by the UFS controller. This is required for
certain automotive platforms with hardware constraints.

Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
---
 Documentation/devicetree/bindings/ufs/qcom,ufs.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
index 6c6043d9809e..9dedd09df9e0 100644
--- a/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
+++ b/Documentation/devicetree/bindings/ufs/qcom,ufs.yaml
@@ -111,6 +111,16 @@ properties:
     description:
       GPIO connected to the RESET pin of the UFS memory device.
 
+  limit-hs-gear:
+    maxItems: 1
+    description:
+      Limit max phy hs gear
+
+  limit-rate:
+    maxItems: 1
+    description:
+      Limit max phy hs rate
+
 required:
   - compatible
   - reg
-- 
2.50.1