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Date:   Tue,  3 Oct 2023 11:15:18 +0800
From:   Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
To:     patrick@...cx.xyz, Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] dt-bindings: hwmon: add MAX31790

Add dt-bindings for the MAXIM MAX31790.

Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
---
Changelog:
v3 - Use 'sensor-type' in 'channel' node to config pwm as tach.
   - Changed the status in MAINTAINERS to 'Maintained'.
v2 - Add dt-bindings for the MAXIM MAX31790.
---
 .../bindings/hwmon/maxim,max31790.yaml        | 89 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 95 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
new file mode 100644
index 000000000000..7f717ab4caac
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/maxim,max31790.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim max31790
+
+maintainers:
+  - Delphine CC Chiu  <Delphine_CC_Chiu@...ynn.com>
+
+description: |
+  The MAX31790 controls the speeds of up to six fans using
+  six independent PWM outputs. The desired fan speeds (or PWM duty cycles)
+  are written through the I2C	interface.
+  The outputs drive “4-wire” fans directly, or can be used to modulate
+  the fan’s power terminals using an external pass transistor.
+
+  Datasheets:
+    https://datasheets.maximintegrated.com/en/ds/MAX31790.pdf
+
+additionalProperties: false
+
+properties:
+  compatible:
+    enum:
+      - maxim,max31790
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^channel@[1-6]$":
+    type: object
+
+    additionalProperties: false
+
+    properties:
+      reg:
+        items:
+          - enum: [1, 2, 3, 4, 5, 6]
+
+      # There are 6 PWM output channel in MAX31790 that allows to be configured
+      # as a TACH input by setting the Fan Configuration register.
+      # The default setting will be PWM output.
+      sensor-type:
+        items:
+          - enum:
+            - PWM
+            - TACH
+
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pwm@20 {
+            compatible = "maxim,max31790";
+            reg = <0x20>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@3 {
+                reg = <3>;
+                sensor-type = "TACH";
+            };
+
+            channel@6 {
+                reg = <6>;
+                sensor-type = "TACH";
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index c8fdd0d03907..21be46200343 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1371,6 +1371,12 @@ F:	Documentation/devicetree/bindings/hwmon/adi,max31760.yaml
 F:	Documentation/hwmon/max31760.rst
 F:	drivers/hwmon/max31760.c
 
+ANALOG DEVICES INC MAX31790 DRIVER
+M:	Delphine CC Chiu  <Delphine_CC_Chiu@...ynn.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
+F:	drivers/hwmon/max31790.c
+
 ANALOGBITS PLL LIBRARIES
 M:	Paul Walmsley <paul.walmsley@...ive.com>
 S:	Supported
-- 
2.25.1

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