[PATCH 1/2] dt-bindings: hwmon: Add LTC4282 bindings

[Nuno Sa <nuno.sa@analog.com>]

Add bindings for the LTC4282 High Current Hot Swap Controller with I2C
Compatible Monitoring.

Signed-off-by: Nuno Sa <nuno.sa@analog.com>
---
 .../bindings/hwmon/adi,ltc4282.yaml           | 228 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 234 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml
new file mode 100644
index 000000000000..0a5d540f014e
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml
@@ -0,0 +1,228 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C
+
+maintainers:
+  - Nuno Sa <nuno.sa@analog.com>
+
+description: |
+  Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C.
+
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf
+
+
+properties:
+  compatible:
+    enum:
+      - adi,ltc4282
+
+  reg:
+    maxItems: 1
+
+  vdd-supply: true
+
+  clocks:
+    maxItems: 1
+
+  adi,clkout-mode:
+    description: |
+      Controls in which mode the CLKOUT PIN should work:
+        0 - Configures the CLKOUT pin to output the internal system clock
+        1 - Configures the CLKOUT pin to output the internal conversion time
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1]
+
+  adi,rsense-nano-ohms:
+    description: Value of the sense resistor.
+
+  adi,vin-mode-microvolt:
+    description:
+      Selects operating range for the Undervoltage, Overvoltage and Foldback
+      pins. Also for the ADC. Should be set to the nominal input voltage.
+    enum: [3300000, 5000000, 12000000, 24000000]
+    default: 12000000
+
+  adi,fet-bad-timeout-ms:
+    description:
+      From the moment a FET bad conditions is present, this property selects the
+      wait time/timeout for a FET-bad fault to be signaled. Setting this to 0,
+      disables FET bad faults to be reported.
+    default: 255
+    maximum: 255
+
+  adi,overvoltage-dividers:
+    description: |
+      Select which dividers to use for VDD Overvoltage detection. Note that
+      when the internal dividers are used the threshold is referenced to VDD.
+      The percentages in the datasheet are misleading since the actual values
+      to look for are in the "Absolute Maximum Ratings" table in the
+      "Comparator Inputs" section. In there there's a line for each of the 5%,
+      10% and 15% settings with the actual min, typical and max tolerances.
+        0 - Use the external dividers.
+        1 - Internal dividers 5%
+        2 - Internal dividers 10%
+        3 - Internal dividers 15%
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3]
+    default: 0
+
+  adi,undervoltage-dividers:
+    description: |
+      Select which dividers to use for VDD Overvoltage detection. Note that
+      when the internal dividers are used the threshold is referenced to VDD.
+      The percentages in the datasheet are misleading since the actual values
+      to look for are in the "Absolute Maximum Ratings" table in the
+      "Comparator Inputs" section. In there there's a line for each of the 5%,
+      10% and 15% settings with the actual min, typical and max tolerances.
+        0 - Use the external dividers.
+        1 - Internal dividers 5%
+        2 - Internal dividers 10%
+        3 - Internal dividers 15%
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2, 3]
+    default: 0
+
+  adi,current-limit-microvolt:
+    description:
+      The current limit sense voltage of the chip is adjustable between
+      12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current
+      on the load.
+    enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375]
+    default: 25000
+
+  adi,overcurrent-retry:
+    description:
+      If set, enables the chip to auto-retry 256 timer cycles after an
+      Overcurrent fault.
+    type: boolean
+
+  adi,overvoltage-retry-disable:
+    description:
+      If set, disables the chip to auto-retry 50ms after an Overvoltage fault.
+      It's enabled by default.
+    type: boolean
+
+  adi,undervoltage-retry-disable:
+    description:
+      If set, disables the chip to auto-retry 50ms after an Undervoltage fault.
+      It's enabled by default.
+    type: boolean
+
+  adi,fault-log-enable:
+    description:
+      If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written
+      to the EEPROM when a fault bit transitions high and hence, will be
+      available after a power cycle (the chip loads the contents of
+      the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot).
+    type: boolean
+
+  adi,gpio-alert:
+    description: Use the ALERT pin as a GPIO.
+    type: boolean
+
+  adi,gpio1-mode:
+    description: |
+      Defines the function of the Pin.
+          0 - GPIO Mode.
+          1 - Power Bad. Goes into high-z to indicate that the output power is
+              no longer good.
+          2 - Power Good. Pulls low to indicate that the output power is no
+              longer good.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 2
+
+  adi,gpio2-mode:
+    description: |
+      Defines the function of the Pin.
+          0 - GPIO Mode.
+          1 - Acts as an input pin and it is feeded into the ADC.
+          2 - Pulls Low when the MOSFET is dissipating power (stress).
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 2
+
+  adi,gpio3-mode:
+    description: |
+      Defines the function of the Pin.
+          0 - GPIO Mode.
+          1 - Acts as an input pin and it is feeded into the ADC.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 1
+
+  gpio-controller:
+    description:
+      This property applies if some of the pins are used as GPIOs.
+
+  '#gpio-cells':
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - adi,rsense-nano-ohms
+
+dependencies:
+  adi,alert-as-gpio: [gpio-controller, '#gpio-cells']
+
+allOf:
+  - if:
+      required:
+        - adi,gpio1-mode
+    then:
+      allOf:
+        - if:
+            properties:
+              adi,gpio0-mode:
+                const: 0
+          then:
+            dependencies:
+              adi,gpio0-mode: [gpio-controller, '#gpio-cells']
+  - if:
+      required:
+        - adi,gpio2-mode
+    then:
+      allOf:
+        - if:
+            properties:
+              adi,gpio1-mode:
+                const: 0
+          then:
+            dependencies:
+              adi,gpio1-mode: [gpio-controller, '#gpio-cells']
+  - if:
+      required:
+        - adi,gpio3-mode
+    then:
+      allOf:
+        - if:
+            properties:
+              adi,gpio2-mode:
+                const: 0
+          then:
+            dependencies:
+              adi,gpio2-mode: [gpio-controller, '#gpio-cells']
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        hwmon@50 {
+            compatible = "adi,ltc4282";
+            reg = <0x50>;
+            adi,rsense-nano-ohms = <500>;
+
+            gpio-controller;
+            #gpio-cells = <2>;
+
+            adi,gpio1-mode = <2>;
+            adi,gpio2-mode = <0>;
+        };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 43121073390c..9f9527f6057b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12481,6 +12481,12 @@ S:	Maintained
 F:	Documentation/hwmon/ltc4261.rst
 F:	drivers/hwmon/ltc4261.c
 
+LTC4282 HARDWARE MONITOR DRIVER
+M:	Nuno Sa <nuno.sa@analog.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Supported
+F:	Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml
+
 LTC4306 I2C MULTIPLEXER DRIVER
 M:	Michael Hennerich <michael.hennerich@analog.com>
 L:	linux-i2c@vger.kernel.org
-- 
2.42.1