linux-kernel - [PATCH 02/14] dt-bindings: arm: coresight: Add support for coresight-loses-context-with-cpu

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Message-Id: <20191104181251.26732-3-mathieu.poirier@linaro.org>
Date:   Mon,  4 Nov 2019 11:12:39 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/14] dt-bindings: arm: coresight: Add support for coresight-loses-context-with-cpu

From: Andrew Murray <andrew.murray@....com>

Some coresight components, because of choices made during hardware
integration, require their state to be saved and restored across CPU low
power states.

The software has no reliable method of detecting when save/restore is
required thus let's add a binding to inform the kernel.

Signed-off-by: Andrew Murray <andrew.murray@....com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 Documentation/devicetree/bindings/arm/coresight.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index fcc3bacfd8bc..d02c42d21f2f 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -87,6 +87,15 @@ its hardware characteristcs.
 
 	* port or ports: see "Graph bindings for Coresight" below.
 
+* Optional properties for all components:
+
+	* arm,coresight-loses-context-with-cpu : boolean. Indicates that the
+	  hardware will lose register context on CPU power down (e.g. CPUIdle).
+	  An example of where this may be needed are systems which contain a
+	  coresight component and CPU in the same power domain. When the CPU
+	  powers down the coresight component also powers down and loses its
+	  context. This property is currently only used for the ETM 4.x driver.
+
 * Optional properties for ETM/PTMs:
 
 	* arm,cp14: must be present if the system accesses ETM/PTM management
-- 
2.17.1