linux-kernel - [PATCH v2 1/6] dt-bindings: ti, sci: Add property for partial-io-wakeup-sources

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Message-ID: <20240729080101.3859701-2-msp@baylibre.com>
Date: Mon, 29 Jul 2024 10:00:56 +0200
From: Markus Schneider-Pargmann <msp@...libre.com>
To: Nishanth Menon <nm@...com>,
	Tero Kristo <kristo@...nel.org>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vignesh Raghavendra <vigneshr@...com>
Cc: Vibhore Vardhan <vibhore@...com>,
	Kevin Hilman <khilman@...libre.com>,
	Dhruva Gole <d-gole@...com>,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Markus Schneider-Pargmann <msp@...libre.com>
Subject: [PATCH v2 1/6] dt-bindings: ti, sci: Add property for partial-io-wakeup-sources

Partial-IO is a very low power mode in which nearly everything is
powered off. Only pins of a few hardware units are kept sensitive and
are capable to wakeup the SoC. The device nodes are marked as
'wakeup-source' but so are a lot of other device nodes as well that are
not able to do a wakeup from Partial-IO. This creates the need to
describe the device nodes that are capable of wakeup from Partial-IO.

This patch adds a property with a list of these nodes defining which
devices can be used as wakeup sources in Partial-IO.

Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
---
 .../devicetree/bindings/arm/keystone/ti,sci.yaml    | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
index 25a2b42105e5..7d6152710573 100644
--- a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
+++ b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
@@ -61,6 +61,19 @@ properties:
   mboxes:
     minItems: 2
 
+  ti,partial-io-wakeup-sources:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      Partial-IO is a low power mode in which nearly everything is powered
+      off. Only pins associated with a few hardware units are capable to
+      wakeup the system from this mode. It is a very small subset of all
+      device nodes that have the 'wakeup-source' property.
+      ti,partial-io-wakeup-sources is the list of device nodes that can
+      wakeup the system from Partial-IO.
+
+      This low power mode depends on the capabilities of the SoC and
+      the firmware.
+
   ti,host-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: |
-- 
2.45.2