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Message-Id: <20200413070014.12960-3-zhang.lyra@gmail.com>
Date: Mon, 13 Apr 2020 15:00:14 +0800
From: zhang.lyra@...il.com
To: "Rafael J . Wysocki" <rjw@...ysocki.net>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Chunyan Zhang <zhang.lyra@...il.com>,
Chunyan Zhang <chunyan.zhang@...soc.com>
Subject: [RFC PATCH v1 2/2] dt-bindings: arm: Add description to the new property for-s2idle-only
From: Chunyan Zhang <chunyan.zhang@...soc.com>
Add a new property for-s2idle-only. The idle-state marked with this
property will be set with CPUIDLE_FLAG_S2IDLE during initialization
and it would be expected to be found as deepest state for s2idle
rather than other cases like play_idle().
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
Documentation/devicetree/bindings/arm/idle-states.yaml | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/arm/idle-states.yaml b/Documentation/devicetree/bindings/arm/idle-states.yaml
index ea805c1e6b20..cec47b3a447f 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.yaml
+++ b/Documentation/devicetree/bindings/arm/idle-states.yaml
@@ -263,7 +263,6 @@ patternProperties:
description: |
Each state node represents an idle state description and must be defined
as follows.
-
The idle state entered by executing the wfi instruction (idle_standby
SBSA,[3][4]) is considered standard on all ARM platforms and therefore
must not be listed.
@@ -283,6 +282,15 @@ patternProperties:
lost on state entry, otherwise it is retained.
type: boolean
+ for-s2idle-only:
+ description:
+ This indicates that the state only can be found as deepest state
+ for s2idle rather than other cases like play_idle(). In general,
+ the state having this property should have longer min-residency
+ than the cpuidle target min-residency which CPU QoS constraints
+ defines, to avoid being used by runtime cpuidle.
+ type: boolean
+
entry-latency-us:
description:
Worst case latency in microseconds required to enter the idle state.
--
2.20.1
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