Add support for MAX30210

Documentation/devicetree/bindings/iio/temperature/adi,max30210.yaml

@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2024 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/temperature/adi,max30210.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX30210 Low-Power I2C Digital Temperature Sensor
+
+maintainers:
+  - Daniel Matyas <[email protected]>
+  - John Erasmus Mari Geronimo <[email protected]>
+
+description: |
+  The MAX30210 operates from 1.7V to 2.0V supply voltage, and is a low-power,
+  high-accuracy digital temperature sensor with ±0.1°C accuracy from +20°C to
+  +50°C and ±0.15°C accuracy from -20°C to +85°C.
+  https://www.analog.com/media/en/technical-documentation/data-sheets/max30210.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,max30210
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: |
+      Analog Supply Voltage Input. Must have values in the interval (1.7V; 5.5V)
+      in order for the device to function correctly.
+
+  powerdown-gpios:
+    description: |
+      GPIO spec for CVT/PDB pin. Should be configured with GPIO_ACTIVE_LOW.
+    maxItems: 1
+
+  interrupts:
+    description: |
+      Connected to INT pin. Should be configured with type IRQ_TYPE_EDGE_BOTH.
+    maxItems: 1
+
+  pwms:
+    description: |
+      If present, CVT/PDB pin is used for external temperature conversion. The
+      active edge of CVT/PDB pin is the polarity of the PWM. Name of PWM should
+      be "ext-cvt-pwm".
+
+  pwm-names:
+    const: ext-cvt-pwm
+
+  adi,ext-conv-rising-edge:
+    description:
+      It is used to set the active edge of the EXT CVT to rising. By default,
+      the active edge is falling.
+    type: boolean
+
+  adi,roc-en:
+    description: |
+      If present, temperature change detection is enabled.
+    type: boolean
+
+  adi,roc-len:
+    description: |
+      If present, this is the length of the rate of change filter. The rate of
+      change is calculated based on the number of samples selected in this
+      property. The user needs to set the appropriate number of samples to fit
+      the application needs. The default value is 2.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [2, 3, 5, 9, 17, 33, 65]
+
+  adi,comp-int:
+    description: |
+      If present, the device is in comparator mode. In this mode, the low
+      temperature threshold value acts as high temperature hysteresis. If not
+      present, interrupt mode is used (default).
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - powerdown-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/pwm/pwm.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        status = "okay";
+
+        temperature-sensor@40 {
+            compatible = "adi,max30210";
+            reg = <0x40>;
+            vdd-supply = <&vdd>;
+            powerdown-gpios = <&gpio 12 GPIO_ACTIVE_LOW>;
+
+            interrupt-parent = <&gpio>;
+            interrupts = <17 IRQ_TYPE_EDGE_BOTH>;
+
+            pwm-names = "ext-cvt-pwm";
+            pwms = <&pwm 0 0>;
+            adi,ext-conv-rising-edge;
+            adi,roc-en;
+            adi,comp-int;
+        };
+    };
+...

MAINTAINERS

@@ -12587,6 +12587,14 @@ F:	Documentation/userspace-api/media/drivers/max2175.rst
 F:	drivers/media/i2c/max2175*
 F:	include/uapi/linux/max2175.h
 
+MAX30210 IIO TEMPERATURE DRIVER
+M:	John Erasmus Mari Geronimo <[email protected]>
+L:	[email protected]
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/temperature/adi,max30210.yaml
+F:	drivers/iio/temperature/max30210.c
+
 MAX31827 TEMPERATURE SWITCH DRIVER
 M:	Daniel Matyas <[email protected]>
 L:	[email protected]

drivers/iio/Kconfig.adi

@@ -203,3 +203,4 @@ config IIO_ALL_ADI_DRIVERS
 	imply ADRV9025
 	imply ADL5580
 	imply LTC2664
+	imply MAX30210

drivers/iio/temperature/Kconfig

@@ -148,4 +148,14 @@ config MAX31865
 	  This driver can also be build as a module. If so, the module
 	  will be called max31865.
 
+config MAX30210
+	tristate "MAX30210 Low-Power I2C Digital Temperature Sensor"
+	depends on I2C
+	help
+	  If you say yes here you get support for MAX30210 low-power digital
+	  temperature sensor chip connected via I2C.
+
+	  This driver can also be build as a module. If so, the module
+	  will be called max30210.
+
 endmenu

drivers/iio/temperature/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_IQS620AT_TEMP) += iqs620at-temp.o
 obj-$(CONFIG_LTC2983) += ltc2983.o
 obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o
 obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
+obj-$(CONFIG_MAX30210) += max30210.o
 obj-$(CONFIG_MAX31856) += max31856.o
 obj-$(CONFIG_MAX31865) += max31865.o
 obj-$(CONFIG_MLX90614) += mlx90614.o