linux-kernel - [RFC PATCH v1 3/7] dt-bindings: power: reset: add bindings for NVMEM hardware storing PSCR Data

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Date: Fri, 19 Jan 2024 14:25:17 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Sebastian Reichel <sre@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Lukasz Luba <lukasz.luba@....com>,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	Søren Andersen <san@...v.dk>
Subject: [RFC PATCH v1 3/7] dt-bindings: power: reset: add bindings for NVMEM hardware storing PSCR Data

Add device tree bindings that describe hardware implementations of
Non-Volatile Memory (NVMEM) used for storing Power State Change Reasons (PSCR).

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 .../bindings/power/reset/pscr-nvmem.yaml      | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/pscr-nvmem.yaml

diff --git a/Documentation/devicetree/bindings/power/reset/pscr-nvmem.yaml b/Documentation/devicetree/bindings/power/reset/pscr-nvmem.yaml
new file mode 100644
index 000000000000..0642b470af41
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/pscr-nvmem.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/state-change/pscr-nvmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic NVMEM Power State Change Reason storage
+
+maintainers:
+  - Oleksij Rempel <o.rempel@...gutronix.de>
+
+description: This binding describes the Non-Volatile Memory (NVMEM) hardware
+  that stores Power State Change Reasons (PSCR).
+
+allOf:
+  - $ref: pse-controller.yaml#
+
+properties:
+  compatible:
+    const: pscr-nvmem
+
+  nvmem-cells:
+    description: |
+      A phandle pointing to the nvmem-cells node where the power state change
+      reasons are stored.
+    maxItems: 1
+
+  nvmem-cell-names:
+    items:
+      - const: pscr
+
+  pscr-unknown:
+  pscr-under-voltage:
+  pscr-over-current:
+  pscr-over-temperature:
+
+required:
+  - compatible
+  - nvmem-cells
+  - nvmem-cell-names
+
+additionalProperties: false
+
+examples:
+  - |
+    power-state-change-reason {
+      compatible = "pscr-nvmem";
+      nvmem-cells = <&pscr_cell>;
+      nvmem-cell-names = "pscr";
+      pscr-unknown = <1>;
+      pscr-under-voltage = <2>;
+      pscr-over-temperature = <3>;
+    };
+...
-- 
2.39.2