[PATCH v7 2/2] dt-bindings: embedded-controller: Add synology microp devices

[Markus Probst via B4 Relay <devnull+markus.probst.posteo.de@kernel.org>]

From: Markus Probst <markus.probst@posteo.de>

Add the Synology Microp devicetree bindings. Those devices are
microcontrollers found on Synology NAS devices. They are connected to a
serial port on the host device.

Those devices are used to control certain LEDs, fan speeds, a beeper, to
handle buttons, fan failures and to properly shutdown and reboot the
device.

The device has a different feature set depending on the Synology NAS
model, like having different number of fans, buttons and leds. Depending
on the architecture of the model, they also need a different system
shutdown behaviour.

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
 .../synology,ds923p-microp.yaml                    | 92 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 93 insertions(+)

diff --git a/Documentation/devicetree/bindings/embedded-controller/synology,ds923p-microp.yaml b/Documentation/devicetree/bindings/embedded-controller/synology,ds923p-microp.yaml
new file mode 100644
index 000000000000..0a8fb1d8f314
--- /dev/null
+++ b/Documentation/devicetree/bindings/embedded-controller/synology,ds923p-microp.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/embedded-controller/synology,ds923p-microp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synology NAS on-board Microcontroller
+
+maintainers:
+  - Markus Probst <markus.probst@posteo.de>
+
+description: |
+  Synology Microp is a microcontroller found in Synology NAS devices.
+  It is connected to a serial port on the host device.
+
+  It is necessary to properly shutdown and reboot the NAS device and
+  provides additional functionality such as led control, fan speed control,
+  a beeper and buttons on the NAS device.
+
+properties:
+  compatible:
+    enum:
+      - synology,ds923p-microp
+      - synology,ds918p-microp
+      - synology,ds214play-microp
+      - synology,ds225p-microp
+      - synology,ds425p-microp
+      - synology,ds710p-microp
+      - synology,ds1010p-microp
+      - synology,ds723p-microp
+      - synology,ds1522p-microp
+      - synology,rs422p-microp
+      - synology,ds725p-microp
+      - synology,ds118-microp
+      - synology,ds124-microp
+      - synology,ds223-microp
+      - synology,ds223j-microp
+      - synology,ds1823xsp-microp
+      - synology,rs822p-microp
+      - synology,rs1221p-microp
+      - synology,rs1221rpp-microp
+      - synology,ds925p-microp
+      - synology,ds1525p-microp
+      - synology,ds1825p-microp
+
+  fan-failure-gpios:
+    description: GPIOs needed to determine which fans stopped working on a fan failure event.
+    minItems: 2
+    maxItems: 3
+
+required:
+  - compatible
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - synology,ds214play-microp
+              - synology,ds225p-microp
+              - synology,ds710p-microp
+              - synology,ds723p-microp
+              - synology,ds725p-microp
+              - synology,ds118-microp
+              - synology,ds124-microp
+              - synology,ds223-microp
+              - synology,ds223j-microp
+              - synology,ds1823xsp-microp
+              - synology,rs822p-microp
+              - synology,rs1221p-microp
+              - synology,rs1221rpp-microp
+              - synology,ds1825p-microp
+    then:
+      properties:
+        fan-failure-gpios: false
+    else:
+      required:
+        - fan-failure-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    embedded-controller {
+      compatible = "synology,ds923p-microp";
+
+      fan-failure-gpios = <&gpio 68 GPIO_ACTIVE_HIGH>, <&gpio 69 GPIO_ACTIVE_HIGH>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 78c99d831431..72075c9a2016 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25557,6 +25557,7 @@ F:	include/uapi/linux/sync_file.h
 SYNOLOGY MICROP DRIVER
 M:	Markus Probst <markus.probst@posteo.de>
 S:	Maintained
+F:	Documentation/devicetree/bindings/embedded-controller/synology,ds923p-microp.yaml
 F:	drivers/platform/synology_microp/
 
 SYNOPSYS ARC ARCHITECTURE

-- 
2.52.0