linux-kernel - [RFC PATCH v3 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

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Date:   Mon, 4 Sep 2023 10:35:41 +0530
From:   Linu Cherian <lcherian@...vell.com>
To:     <suzuki.poulose@....com>, <mike.leach@...aro.org>,
        <james.clark@....com>, <leo.yan@...aro.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <coresight@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <sgoutham@...vell.com>, <gcherian@...vell.com>,
        Linu Cherian <lcherian@...vell.com>
Subject: [RFC PATCH v3 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

memory-region 0: Reserved trace buffer memory

  TMC ETR: When available, use this reserved memory region for
  trace data capture. Same region is used for trace data
  retention after a panic or watchdog reset.

  TMC ETF: When available, use this reserved memory region for
  trace data retention synced from internal SRAM after a panic or
  watchdog reset.

memory-region 1: Reserved meta data memory

  TMC ETR, ETF: When available, use this memory for register
  snapshot retention synced from hardware registers after a panic
  or watchdog reset.

Signed-off-by: Linu Cherian <lcherian@...vell.com>
---
 .../devicetree/bindings/arm/arm,coresight-tmc.yaml  | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
index cb8dceaca70e..dce54978554a 100644
--- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
+++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
@@ -101,6 +101,17 @@ properties:
           and ETF configurations.
         $ref: /schemas/graph.yaml#/properties/port
 
+   memory-region:
+    items:
+      - description: Reserved trace buffer memory for ETR and ETF sinks.
+        For ETR, this reserved memory region is used for trace data capture.
+        Same region is used for trace data retention as well after a panic
+        or watchdog reset.
+        For ETF, this reserved memory region is used for retention of trace
+        data synced from internal SRAM after a panic or watchdog reset.
+
+      - description: Reserved meta data memory. Used for ETR and ETF sinks.
+
 required:
   - compatible
   - reg
@@ -115,6 +126,8 @@ examples:
     etr@...70000 {
         compatible = "arm,coresight-tmc", "arm,primecell";
         reg = <0x20070000 0x1000>;
+        memory-region = <&etr_trace_mem_reserved>,
+                       <&etr_mdata_mem_reserved>;
 
         clocks = <&oscclk6a>;
         clock-names = "apb_pclk";
-- 
2.41.0