[PATCH v4 6/6] dt-bindings: arm: coresight: Add support for coresight-needs-save-restore
From: Andrew Murray <hidden>
Date: 2019-07-30 12:53:50
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- Documentation/devicetree/bindings/arm/coresight.txt | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index fcc3bacfd8bc..7cbdb7893af8 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt@@ -92,6 +92,9 @@ its hardware characteristcs. * arm,cp14: must be present if the system accesses ETM/PTM management registers via co-processor 14. + * arm,coresight-needs-save-restore: boolean. Indicates that software + should save/restore state across power down. + * Optional property for TMC: * arm,buffer-size: size of contiguous buffer space for TMC ETR
--
2.21.0
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