[PATCH 1/2] dt-bindings: cpu: idle-states: Add idle-state-disabled property

From: Tushar Nimkar <quic_tnimkar@quicinc.com>
To: "Rafael J . Wysocki" <rafael@kernel.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Ulf Hansson <ulf.hansson@linaro.org>
Cc: <linux-pm@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <quic_lsrao@quicinc.com>,
	<quic_mkshah@quicinc.com>,
	Tushar Nimkar <quic_tnimkar@quicinc.com>,
	<devicetree@vger.kernel.org>
Subject: [PATCH 1/2] dt-bindings: cpu: idle-states: Add idle-state-disabled property
Date: Thu, 8 Jun 2023 14:25:43 +0530	[thread overview]
Message-ID: <20230608085544.16211-3-quic_tnimkar@quicinc.com> (raw)
In-Reply-To: <20230608085544.16211-1-quic_tnimkar@quicinc.com>

This change adds idle-state-disabled property using which certain or all
idle-states can be kept disabled during boot-up. Once boot-up is completed
same can be enabled using below command.

echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable

Cc: devicetree@vger.kernel.org
Signed-off-by: Tushar Nimkar <quic_tnimkar@quicinc.com>
---
 Documentation/devicetree/bindings/cpu/idle-states.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/cpu/idle-states.yaml b/Documentation/devicetree/bindings/cpu/idle-states.yaml
index b8cc826c9501..f999bc666bbd 100644
--- a/Documentation/devicetree/bindings/cpu/idle-states.yaml
+++ b/Documentation/devicetree/bindings/cpu/idle-states.yaml
@@ -358,6 +358,13 @@ patternProperties:
           systems entry-latency-us + exit-latency-us will exceed
           wakeup-latency-us by this duration.
 
+      idle-state-disabled:
+        description: |
+          If present the idle state stays disabled. It can be enabled back from
+          shell using below command.
+          echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable
+        type: boolean
+
       idle-state-name:
         $ref: /schemas/types.yaml#/definitions/string
         description:
@@ -548,6 +555,7 @@ examples:
             CPU_SLEEP_0_0: cpu-sleep-0-0 {
                 compatible = "arm,idle-state";
                 local-timer-stop;
+                idle-state-disabled;
                 arm,psci-suspend-param = <0x0010000>;
                 entry-latency-us = <250>;
                 exit-latency-us = <500>;
-- 
2.17.1

