[PATCH v6 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 provides GPIO control and a watchdog timer.

Reviewed-by: Conor Dooley <[email protected]>
Signed-off-by: Thomas Perrot (Schneider Electric) <[email protected]>
---
 .../bindings/mfd/aaeon,srg-imx8p-mcu.yaml          | 67 ++++++++++++++++++++++
 MAINTAINERS                                        |  6 ++
 2 files changed, 73 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8p-mcu.yaml b/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8p-mcu.yaml
new file mode 100644
index 000000000000..034fb7b42551
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/aaeon,srg-imx8p-mcu.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/aaeon,srg-imx8p-mcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AAEON Embedded Controller
+
+maintainers:
+  - Jérémie Dautheribes <[email protected]>
+  - Thomas Perrot <[email protected]>
+
+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-imx8p-mcu
+
+  reg:
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-line-names:
+    minItems: 1
+    maxItems: 19
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - "#gpio-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      embedded-controller@62 {
+        compatible = "aaeon,srg-imx8p-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 c9e416ba74c6..ea9d55f76f35 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-IMX8P CONTROLLER MFD DRIVER
+M:	Thomas Perrot <[email protected]>
+R:	Jérémie Dautheribes <[email protected]>
+S:	Maintained
+F:	Documentation/devicetree/bindings/mfd/aaeon,srg-imx8p-mcu.yaml
+
 AAEON UPBOARD FPGA MFD DRIVER
 M:	Thomas Richard <[email protected]>
 S:	Maintained

-- 
2.54.0