linux-kernel - [PATCH v2 2/3] dt-bindings: hwmon: Add Microchip EMC2101 support

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Message-Id: <20250701181228.1196102-3-noltari@gmail.com>
Date: Tue,  1 Jul 2025 20:12:27 +0200
From: Álvaro Fernández Rojas <noltari@...il.com>
To: jdelvare@...e.com,
	linux@...ck-us.net,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	corbet@....net,
	linux-hwmon@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Cc: Álvaro Fernández Rojas <noltari@...il.com>
Subject: [PATCH v2 2/3] dt-bindings: hwmon: Add Microchip EMC2101 support

Introduce yaml schema for Microchip emc2101 pwm fan controller with
temperature monitoring.

Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
---
 .../bindings/hwmon/microchip,emc2101.yaml     | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml

 v2: add missing properties.

diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
new file mode 100644
index 000000000000..0966559d373e
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/microchip,emc2101.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip EMC2101 SMBus compliant PWM fan controller
+
+maintainers:
+  - Álvaro Fernández Rojas <noltari@...il.com>
+
+description:
+  Microchip EMC2101 pwm controller which supports up to 1 fan, 1 internal
+  temperature sensor, 1 external temperature sensor and an 8 entry look
+  up table to create a programmable temperature response.
+
+properties:
+  compatible:
+    enum:
+      - microchip,emc2101
+      - microchip,emc2101-r
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  '#pwm-cells':
+    const: 2
+    description: |
+      Number of cells in a PWM specifier.
+      - cell 0: The PWM frequency
+      - cell 1: The PWM polarity: 0 or PWM_POLARITY_INVERTED
+
+patternProperties:
+  '^fan@0$':
+    $ref: fan-common.yaml#
+    unevaluatedProperties: false
+    properties:
+      reg:
+        description:
+          The fan number used to determine the associated PWM channel.
+        maxItems: 1
+
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        fan_controller: fan-controller@4c {
+            compatible = "microchip,emc2101";
+            reg = <0x4c>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+            #pwm-cells = <2>;
+
+            fan@0 {
+                reg = <0x0>;
+                pwms = <&fan_controller 5806 0>;
+                #cooling-cells = <2>;
+            };
+        };
+    };
+...
-- 
2.39.5