[PATCH v10 1/2] dt-bindings: iio: health: add adi,max86150

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

Add the Device Tree binding schema for the Analog Devices MAX86150
integrated biosensor, which combines two photoplethysmography (PPG)
channels (Red LED and IR LED) and one electrocardiogram (ECG) channel
in a single I2C device. Samples are buffered in a 32-entry hardware
FIFO with a configurable almost-full interrupt.

The device requires four independent supply rails per the datasheet
power tree: digital core (vdd), analog core (avdd), ECG reference
(vref), and LED anode (leds).

Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Md Shofiqul Islam <shofiqtest@gmail.com>
---
 .../bindings/iio/health/adi,max86150.yaml     | 78 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 84 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 0000000000000..da2ff9b0ada2b
--- /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_LEVEL_LOW>;
+            vdd-supply = <&vdd_1v8>;
+            avdd-supply = <&vdd_1v8>;
+            vref-supply = <&vdd_1v8>;
+            leds-supply = <&vdd_3v3>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3115538ce8291..189385966de82 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15705,6 +15705,12 @@ S:	Orphan
 F:	Documentation/hwmon/max6650.rst
 F:	drivers/hwmon/max6650.c
 
+MAX86150 ECG AND PPG BIOSENSOR DRIVER
+M:	Md Shofiqul Islam <shofiqtest@gmail.com>
+L:	linux-iio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/health/adi,max86150.yaml
+
 MAX9286 QUAD GMSL DESERIALIZER DRIVER
 M:	Jacopo Mondi <jacopo+renesas@jmondi.org>
 M:	Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
-- 
2.51.1