Commit b7909065 authored by Andrew Murray's avatar Andrew Murray Committed by Greg Kroah-Hartman

dt-bindings: arm: coresight: Add support for coresight-loses-context-with-cpu

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: default avatarAndrew Murray <andrew.murray@arm.com>
Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20191104181251.26732-3-mathieu.poirier@linaro.orgSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f188b5e7
...@@ -87,6 +87,15 @@ its hardware characteristcs. ...@@ -87,6 +87,15 @@ its hardware characteristcs.
* port or ports: see "Graph bindings for Coresight" below. * 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: * Optional properties for ETM/PTMs:
* arm,cp14: must be present if the system accesses ETM/PTM management * arm,cp14: must be present if the system accesses ETM/PTM management
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment