From: Andrew Murray <andrew.murray@arm.com>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: coresight@lists.linaro.org, Sudeep Holla <sudeep.holla@arm.com>,
Leo Yan <leo.yan@linaro.org>,
linux-arm-kernel@lists.infradead.org,
Mike Leach <mike.leach@linaro.org>
Subject: [PATCH v3 6/6] dt-bindings: arm: coresight: Add support for coresight-needs-save-restore
Date: Thu, 11 Jul 2019 17:01:14 +0100 [thread overview]
Message-ID: <20190711160114.634-7-andrew.murray@arm.com> (raw)
In-Reply-To: <20190711160114.634-1-andrew.murray@arm.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@arm.com>
---
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 8a88ddebc1a2..e0dc0a93312f 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -90,6 +90,9 @@ its hardware characteristcs.
* cpu: the cpu phandle this ETM/PTM is affined to. When omitted the
source is considered to belong to CPU0.
+ * 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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prev parent reply other threads:[~2019-07-11 16:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-11 16:01 [PATCH v3 0/6] coresight: etm4x: save/restore ETMv4 context across CPU low power states Andrew Murray
2019-07-11 16:01 ` [PATCH v3 1/6] coresight: etm4x: remove superfluous setting of os_unlock Andrew Murray
2019-07-11 16:01 ` [PATCH v3 2/6] coresight: etm4x: use explicit barriers on enable/disable Andrew Murray
2019-07-11 16:01 ` Andrew Murray
2019-07-11 16:01 ` [PATCH v3 3/6] coresight: etm4x: use module_param instead of module_param_named Andrew Murray
2019-07-11 16:01 ` [PATCH v3 4/6] coresight: etm4x: improve clarity of etm4_os_unlock comment Andrew Murray
2019-07-11 16:01 ` [PATCH v3 5/6] coresight: etm4x: save/restore state across CPU low power states Andrew Murray
2019-07-12 15:00 ` [PATCH] coresight: etm4x: lazily allocate memory for save_state Andrew Murray
2019-07-22 20:32 ` Mathieu Poirier
2019-07-23 9:05 ` Suzuki K Poulose
2019-07-26 11:24 ` Andrew Murray
2019-07-30 10:15 ` Suzuki K Poulose
2019-07-15 14:22 ` [PATCH v3 5/6] coresight: etm4x: save/restore state across CPU low power states Mike Leach
2019-07-16 11:50 ` Andrew Murray
2019-07-16 14:43 ` Mike Leach
2019-07-15 23:04 ` Mathieu Poirier
2019-07-16 11:52 ` Andrew Murray
2019-07-11 16:01 ` Andrew Murray [this message]
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