linux-kernel - [RFC PATCH v1 1/2] dt-bindings: firmware: add toradex,embedded-controller

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Message-Id: <20250313144331.70591-2-francesco@dolcini.it>
Date: Thu, 13 Mar 2025 15:43:30 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Emanuele Ghidoli <ghidoliemanuele@...il.com>,
	Francesco Dolcini <francesco@...cini.it>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	soc@...nel.org,
	Andy Shevchenko <andy@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [RFC PATCH v1 1/2] dt-bindings: firmware: add toradex,embedded-controller

From: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>

The Toradex Embedded Controller serves as a system controller, providing
system power-off and restart functionalities
The two variants, Smarc iMX95 and Smarc iMX8P, have a compatible I2C interface.
Besides this, different compatible values are defined to allow for
future implementation differences.

Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
 .../firmware/toradex,embedded-controller.yaml | 44 +++++++++++++++++++
 MAINTAINERS                                   |  6 +++
 2 files changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/toradex,embedded-controller.yaml

diff --git a/Documentation/devicetree/bindings/firmware/toradex,embedded-controller.yaml b/Documentation/devicetree/bindings/firmware/toradex,embedded-controller.yaml
new file mode 100644
index 000000000000..626e5e653c0d
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/toradex,embedded-controller.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/toradex,embedded-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Toradex Embedded Controller
+
+maintainers:
+  - Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
+  - Francesco Dolcini <francesco.dolcini@...adex.com>
+
+description:
+  The Toradex Embedded Controller acts as a system controller which provides
+  system power off and restart.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - toradex,smarc-imx95-ec
+          - toradex,smarc-imx8mp-ec
+      - const: toradex,embedded-controller
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        embedded-controller@28 {
+            compatible = "toradex,smarc-imx95-ec", "toradex,embedded-controller";
+            reg = <0x28>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index ed7aa6867674..19d7c17c0115 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -23972,6 +23972,12 @@ L:	platform-driver-x86@...r.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/topstar-laptop.c
 
+TORADEX EMBEDDED CONTROLLER DRIVER
+M:	Emanuele Ghidoli <ghidoliemanuele@...il.com>
+M:	Francesco Dolcini <francesco@...cini.it>
+S:	Maintained
+F:	Documentation/devicetree/bindings/firmware/toradex,embedded-controller.yaml
+
 TORTURE-TEST MODULES
 M:	Davidlohr Bueso <dave@...olabs.net>
 M:	"Paul E. McKenney" <paulmck@...nel.org>
-- 
2.39.5