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

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

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@...r.kernel.org
Signed-off-by: Tushar Nimkar <quic_tnimkar@...cinc.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