[PATCH v5 1/3] dt-bindings: iio: health: add adi,max86150

[Md Shofiqul Islam <shofiqtest@gmail.com>]

Add Device Tree binding schema for the Analog Devices MAX86150
integrated ECG and PPG biosensor.

The device exposes two PPG channels (Red LED and IR LED) and one ECG
channel over I2C, with a 32-entry hardware FIFO and an active-low
interrupt.

Signed-off-by: Md Shofiqul Islam <shofiqtest@gmail.com>
---
 .../bindings/iio/health/adi,max86150.yaml     | 78 +++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/health/adi,max86150.yaml

diff --git a/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml b/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml
new file mode 100644
index 000000000000..c191f4f1525b
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml
@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/health/adi,max86150.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX86150 ECG and PPG Biosensor
+
+maintainers:
+  - Md Shofiqul Islam <shofiqtest@gmail.com>
+
+description: |
+  The MAX86150 is an integrated biosensor SoC that combines:
+    - Two PPG (photoplethysmography) channels: Red LED and IR LED,
+      for heart rate and blood-oxygen saturation (SpO2) measurement.
+    - One ECG (electrocardiogram) channel for biopotential recording.
+
+  The device communicates over I2C at up to 400 kHz and raises an
+  active-low interrupt when the 32-entry hardware FIFO reaches its
+  configurable almost-full threshold.
+
+  Datasheet:
+    https://www.analog.com/media/en/technical-documentation/data-sheets/MAX86150.pdf
+
+properties:
+  compatible:
+    const: adi,max86150
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+    description: |
+      Active-low interrupt line.  Asserted when the FIFO almost-full
+      threshold is reached or when a new PPG sample is ready.
+
+  vdd-supply:
+    description: Digital core power supply (1.8 V).
+
+  avdd-supply:
+    description: Analog core power supply (1.8 V).
+
+  vref-supply:
+    description: ECG reference voltage supply.
+
+  leds-supply:
+    description: LED anode supply, typically 3.3 V.
+
+required:
+  - compatible
+  - reg
+  - vdd-supply
+  - avdd-supply
+  - vref-supply
+  - leds-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        heart-rate@5e {
+            compatible = "adi,max86150";
+            reg = <0x5e>;
+            interrupt-parent = <&gpio1>;
+            interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
+            vdd-supply = <&vdd_1v8>;
+            avdd-supply = <&vdd_1v8>;
+            vref-supply = <&vdd_1v8>;
+            leds-supply = <&vdd_3v3>;
+        };
+    };
-- 
2.51.1