linux-kernel - [PATCH 1/6] dt-bindings: ti,sci: Add ti,ctx-memory-region property

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Date:   Thu, 21 Apr 2022 15:36:54 -0500
From:   Dave Gerlach <d-gerlach@...com>
To:     Rob Herring <robh+dt@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Tero Kristo <kristo@...nel.org>, Nishanth Menon <nm@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Dave Gerlach <d-gerlach@...com>
Subject: [PATCH 1/6] dt-bindings: ti,sci: Add ti,ctx-memory-region property

Add documentation for the ti,ctx-memory-region property which is a
phandle to a reserved-memory carveout to be used by the ti_sci driver
storage of low power mode memory context. This is optional for normal
system operation but required to enabled suspend-to-mem usage of Deep
Sleep state.

Signed-off-by: Dave Gerlach <d-gerlach@...com>
---
 .../devicetree/bindings/arm/keystone/ti,sci.yaml         | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
index 34f5f877d444..ec88aa88a2a0 100644
--- a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
+++ b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
@@ -61,6 +61,15 @@ properties:
   mboxes:
     minItems: 2
 
+  ti,ctx-memory-region:
+    description:
+      Phandle to the reserved memory node to be associated with the
+      ti-sci device, to be used for saving low power context. The
+      reserved memory node should be a carveout node, and should
+      be defined as per the bindings in
+      Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml
+    $ref: /schemas/types.yaml#/definitions/string
+
   ti,system-reboot-controller:
     description: Determines If system reboot can be triggered by SoC reboot
     type: boolean
-- 
2.35.0