[PATCH hwmon-next v2 2/3] dt-bindings: hwmon: add Microchip EMC2305 fan controller.

[<michaelsh@nvidia.com>]

From: Michael Shych <michaelsh@nvidia.com>

Add basic description of emc2305 driver device tree binding.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
---
v1->v2
- Fix dt binding check errors;
- Add descriptions;
- Add missing fields;
- Change the patch subject name;
- Separate pwm-min, pwm-max per PWM channel.
---
 .../bindings/hwmon/microchip,emc2305.yaml          | 87 ++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
new file mode 100644
index 000000000000..0aa65dcfd238
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/microchip,emc2305.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip EMC2305 RPM-based PWM Fan Speed Controller
+
+maintainers:
+  - Michael Shych <michaelsh@nvidia.com>
+
+description: |
+  Microchip EMC2301/2/3/5 are RPM-based PWM Fan Controller.
+  The Fan Controller supports up to 5 independently controlled PWM fan drives.
+  Fan rotation speeds are reported in RPM.
+
+  Datasheet: https://www.microchip.com/en-us/product/EMC2305
+
+properties:
+  compatible:
+    enum:
+      - microcip,emc2305
+      - microcip,emc2303
+      - microcip,emc2302
+      - microcip,emc2301
+
+  microchip,pwm-channel:
+    description:
+      Max number of pwm channels.
+      Zero index is used in case of one common PWM setting.
+      Number of used separted pwm channels can be less than
+      maximum number of available pwm chnnels on this FAN controller.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    items:
+      minimum: 0
+      maximum: 5
+      default: 0
+    maxItems: 1
+
+  microchip,cooling-levels:
+    description:
+      Quantity of cooling level state.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    items:
+      minimum: 0
+      maximum: 10
+      default: 10
+    maxItems: 1
+
+  microchip,pwm-min:
+    description:
+      Min pwm of emc2305
+    $ref: /schemas/types.yaml#/definitions/uint8
+    default: 0
+    maxItems: 1
+
+  microchip,pwm-max:
+    description:
+      Max pwm of emc2305
+    $ref: /schemas/types.yaml#/definitions/uint8
+    default: 255
+    maxItems: 1
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    fan {
+        microchip,compatible = "microchip,emc2305";
+        microchip,pwm-channel = <5>;
+        microchip,cooling-levels = <10>;
+        microchip,pwms {
+            pwm@0 {
+                      pwm-min = <0>;
+                      pwm-max = <255>;
+            };
+            pwm@1 {
+                      pwm-min = <0>;
+                      pwm-max = <255>;
+            };
+        };
+    };
+
-- 
2.14.1