linux-kernel - [PATCH v7 6/9] dt-bindings: arm: add an interrupt property for Coresight CTCU

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Message-Id: <20251013-enable-byte-cntr-for-ctcu-v7-6-e1e8f41e15dd@oss.qualcomm.com>
Date: Mon, 13 Oct 2025 13:49:15 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Tingwei Zhang <tingwei.zhang@....qualcomm.com>,
        Yuanfang Zhang <yuanfang.zhang@....qualcomm.com>,
        Mao Jinlong <jinlong.mao@....qualcomm.com>,
        Jie Gan <quic_jiegan@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, Jie Gan <jie.gan@....qualcomm.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v7 6/9] dt-bindings: arm: add an interrupt property for
 Coresight CTCU

Add an interrupt property to CTCU device. The interrupt will be triggered
when the data size in the ETR buffer exceeds the threshold of the
BYTECNTRVAL register. Programming a threshold in the BYTECNTRVAL register
of CTCU device will enable the interrupt.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
---
 .../devicetree/bindings/arm/qcom,coresight-ctcu.yaml    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
index c969c16c21ef..02797e5f3b58 100644
--- a/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-ctcu.yaml
@@ -39,6 +39,16 @@ properties:
     items:
       - const: apb
 
+  interrupts:
+    items:
+      - description: Byte cntr interrupt for etr0
+      - description: Byte cntr interrupt for etr1
+
+  interrupt-names:
+    items:
+      - const: etr0
+      - const: etr1
+
   label:
     description:
       Description of a coresight device.
@@ -60,6 +70,8 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
     ctcu@...1000 {
         compatible = "qcom,sa8775p-ctcu";
         reg = <0x1001000 0x1000>;
@@ -67,6 +79,11 @@ examples:
         clocks = <&aoss_qmp>;
         clock-names = "apb";
 
+        interrupts = <GIC_SPI 270 IRQ_TYPE_EDGE_RISING>,
+                     <GIC_SPI 262 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "etr0",
+                          "etr1";
+
         in-ports {
             #address-cells = <1>;
             #size-cells = <0>;

-- 
2.34.1