overlays: Add MAX30102 HR to i2c-sensor overlay

Add support for the MAX30102 heart rate and blood oxygen sensor to the
i2c-sensor overlay.

See: raspberrypi/linux#4535

Signed-off-by: Phil Elwell <[email protected]>

Author: jclsn

arch/arm/boot/dts/overlays/README

@@ -1725,6 +1725,9 @@ Params: addr                    Set the address for the BH1750, BME280, BME680,
 
         htu21                   Select the HTU21 temperature and humidity sensor
 
+        int_pin                 Set the GPIO to use for interrupts (max30102
+                                only)
+
         lm75                    Select the Maxim LM75 temperature sensor
                                 Valid addresses 0x48-0x4f, default 0x4f
 
@@ -1733,6 +1736,9 @@ Params: addr                    Set the address for the BH1750, BME280, BME680,
         max17040                Select the Maxim Integrated MAX17040 battery
                                 monitor
 
+        max30102                Select the Maxim Integrated MAX30102 heart-rate
+                                and blood-oxygen sensor
+
         sht3x                   Select the Sensiron SHT3x temperature and
                                 humidity sensor. Valid addresses 0x44-0x45,
                                 default 0x44

arch/arm/boot/dts/overlays/i2c-sensor-overlay.dts

@@ -291,11 +291,30 @@
 		};
 	};
 
+	fragment@19 {
+		target = <&i2c_arm>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			max30102: max30102@57 {
+				compatible = "maxim,max30102";
+				reg = <0x57>;
+				maxim,red-led-current-microamp = <7000>;
+				maxim,ir-led-current-microamp  = <7000>;
+				interrupt-parent = <&gpio>;
+				interrupts = <4 2>;
+			};
+		};
+	};
+
 	__overrides__ {
 		addr =  <&bme280>,"reg:0", <&bmp280>,"reg:0", <&tmp102>,"reg:0",
 			<&lm75>,"reg:0", <&hdc100x>,"reg:0", <&sht3x>,"reg:0",
 			<&ds1621>,"reg:0", <&bme680>,"reg:0", <&ccs811>,"reg:0",
 			<&bh1750>,"reg:0";
+		int_pin = <&max30102>, "interrupts:0";
 		bme280 = <0>,"+0";
 		bmp085 = <0>,"+1";
 		bmp180 = <0>,"+2";
@@ -316,5 +335,6 @@
 		sgp30 = <0>,"+16";
 		ccs811 = <0>, "+17";
 		bh1750 = <0>, "+18";
+		max30102 = <0>,"+19";
 	};
 };