On Fri, 15 May 2020 at 10:23, Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx> wrote: > > From: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx> > > Add "qcom,skip-power-up" property to identify systems which can > skip powering up of trace unit since they share the same power > domain as their CPU core. This is required to identify such > systems with hardware errata which stops the CPU watchdog counter > when the power up bit is set (TRCPDCR.PU). > > Signed-off-by: Tingwei Zhang <tingwei@xxxxxxxxxxxxxx> > Co-developed-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx> > Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/arm/coresight.txt | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt > index 846f6daae71b..e4b2eda0b53b 100644 > --- a/Documentation/devicetree/bindings/arm/coresight.txt > +++ b/Documentation/devicetree/bindings/arm/coresight.txt > @@ -108,6 +108,13 @@ its hardware characteristcs. > * arm,cp14: must be present if the system accesses ETM/PTM management > registers via co-processor 14. > > + * qcom,skip-power-up: boolean. Indicates that an implementation can > + skip powering up the trace unit. TRCPDCR.PU does not have to be set > + on Qualcomm Technologies Inc. systems since ETMs are in the same power > + domain as their CPU cores. This property is required to identify such > + systems with hardware errata where the CPU watchdog counter is stopped > + when TRCPDCR.PU is set. > + > * Optional property for TMC: Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> > > * arm,buffer-size: size of contiguous buffer space for TMC ETR > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation
