linux-kernel - [PATCH 1/3] dt-bindings: arm,psci: Allow S2RAM power

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Message-Id: <20241028-topic-cpu_suspend_s2ram-v1-1-9fdd9a04b75c@oss.qualcomm.com>
Date: Mon, 28 Oct 2024 15:22:57 +0100
From: Konrad Dybcio <konradybcio@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Mark Rutland <mark.rutland@....com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Bjorn Andersson <bjorn.andersson@....qualcomm.com>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH 1/3] dt-bindings: arm,psci: Allow S2RAM power_state
 parameter description

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Certain firmware implementations (such as the ones found on Qualcomm
SoCs between roughly 2015 and 2023) expose an S3-like S2RAM state
through the CPU_SUSPEND call, as opposed to exposing PSCIv1.0's
optional PSCI_SYSTEM_SUSPEND.

This really doesn't work well with the model where we associate all
calls to CPU_SUSPEND with cpuidle. Allow specifying a single special
CPU_SUSPEND suspend parameter value that is to be treated just like
SYSTEM_SUSPEND from the OS's point of view.

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 Documentation/devicetree/bindings/arm/psci.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/psci.yaml b/Documentation/devicetree/bindings/arm/psci.yaml
index cbb012e217ab80c1ca88e611e7acc06c6d56fad0..a6901878697c8e1ec1cbfed62298ae3bc58f2501 100644
--- a/Documentation/devicetree/bindings/arm/psci.yaml
+++ b/Documentation/devicetree/bindings/arm/psci.yaml
@@ -98,6 +98,12 @@ properties:
       [1] Kernel documentation - ARM idle states bindings
         Documentation/devicetree/bindings/cpu/idle-states.yaml
 
+  arm,psci-s2ram-param:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      power_state parameter denoting the S2RAM/S3-like system suspend state
+    maxItems: 1
+
 patternProperties:
   "^power-domain-":
     $ref: /schemas/power/power-domain.yaml#

-- 
2.47.0