linux-kernel - [PATCH v2 2/5] dt-bindings: mfd: Add AAEON embedded controller

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Message-Id: <20260123-dev-b4-aaeon-mcu-driver-v2-2-9f4c00bfb5cb@bootlin.com>
Date: Fri, 23 Jan 2026 10:54:31 +0100
From: "Thomas Perrot (Schneider Electric)" <thomas.perrot@...tlin.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Linus Walleij <linusw@...nel.org>, 
 Bartosz Golaszewski <brgl@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>, 
 Wim Van Sebroeck <wim@...ux-watchdog.org>, 
 Guenter Roeck <linux@...ck-us.net>, Lee Jones <lee@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-watchdog@...r.kernel.org, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 "Thomas Perrot (Schneider Electric)" <thomas.perrot@...tlin.com>
Subject: [PATCH v2 2/5] dt-bindings: mfd: Add AAEON embedded controller

Add device tree binding documentation for the AAEON embedded controller
(MCU). This microcontroller is found on AAEON embedded boards, it is
connected via I2C and  and provides a GPIO control and watchdog timer.

Signed-off-by: Thomas Perrot (Schneider Electric) <thomas.perrot@...tlin.com>
---
 .../bindings/mfd/aaeon,srg-imx8pl-mcu.yaml         | 56 ++++++++++++++++++++++
 MAINTAINERS                                        |  6 +++
 2 files changed, 62 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8pl-mcu.yaml b/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8pl-mcu.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..b8eb5bf88853b6eb3d31841e1f6d6acd4b776bd4
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8pl-mcu.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/aaeon,srg-imx8pl-mcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AAEON Embedded Controller
+
+maintainers:
+  - Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>
+  - Thomas Perrot <thomas.perrot@...tlin.com>
+
+description:
+  AAEON embeds a microcontroller on Standard RISC Gateway with ARM i.MX8M Plus
+  Quad-Core boards providing GPIO control and watchdog timer.
+
+  This MCU is connected via I2C bus.
+
+  Its GPIO controller provides 7 GPOs and 12 GPIOs.
+
+  Its watchdog has a fixed maximum hardware heartbeat of 25 seconds and supports
+  a timeout of 240 seconds through automatic pinging.
+  The timeout is not programmable and cannot be changed via device tree properties.
+
+properties:
+  compatible:
+    const: aaeon,srg-imx8pl-mcu
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      aaeon_mcu: embedded-controller@62 {
+        compatible = "aaeon,srg-imx8pl-mcu";
+        reg = <0x62>;
+
+        gpio-controller;
+        #gpio-cells = <2>;
+        gpio-line-names = "gpo-1", "gpo-2", "gpo-3", "gpo-4",
+                  "gpo-5", "gpo-6", "gpo-7",
+                  "gpio-1", "gpio-2", "gpio-3", "gpio-4",
+                  "gpio-5", "gpio-6", "gpio-7", "gpio-8",
+                  "gpio-9", "gpio-10", "gpio-11", "gpio-12";
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index c9e416ba74c64e90629c0b7d7941f879c9ac589e..10f7d5b183795376b3fcdedc9c3835eecb9d0a3b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -186,6 +186,12 @@ W:	http://www.adaptec.com/
 F:	Documentation/scsi/aacraid.rst
 F:	drivers/scsi/aacraid/
 
+AAEON SRG-IMX8PL CONTROLLER MFD DRIVER
+M:	Thomas Perrot <thomas.perrot@...tlin.com>
+R:	Jérémie Dautheribes <jeremie.dautheribes@...tlin.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/mfd/aaeon,srg-imx8pl-mcu.yaml
+
 AAEON UPBOARD FPGA MFD DRIVER
 M:	Thomas Richard <thomas.richard@...tlin.com>
 S:	Maintained

-- 
2.52.0