linux-kernel - [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width property

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Message-ID: <20251008031737.7321-2-raskar.shree97@gmail.com>
Date: Wed,  8 Oct 2025 08:47:36 +0530
From: Shrikant Raskar <raskar.shree97@...il.com>
To: jic23@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: dlechner@...libre.com,
	nuno.sa@...log.com,
	andy@...nel.org,
	matt@...ostay.sg,
	skhan@...uxfoundation.org,
	david.hunter.linux@...il.com,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev,
	Shrikant Raskar <raskar.shree97@...il.com>
Subject: [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width property

The appropriate LED pulse width for the MAX30100 depends on
board-specific optical and mechanical design (lens, enclosure,
LED-to-sensor distance) and the trade-off between measurement
resolution and power consumption. Encoding it in Device Tree
documents these platform choices and ensures consistent behavior.

Tested on: Raspberry Pi 3B + MAX30100 breakout board.

Signed-off-by: Shrikant Raskar <raskar.shree97@...il.com>

Changes since v1:
Add unit suffix.
Drop redundant description.

Link to v1:
https://lore.kernel.org/all/20251004015623.7019-2-raskar.shree97@gmail.com/
---
 .../devicetree/bindings/iio/health/maxim,max30100.yaml      | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml b/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
index 967778fb0ce8..5c651a0151cc 100644
--- a/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
+++ b/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
@@ -27,6 +27,11 @@ properties:
       LED current whilst the engine is running. First indexed value is
       the configuration for the RED LED, and second value is for the IR LED.
 
+  maxim,pulse-width-us:
+    maxItems: 1
+    description: Pulse width in microseconds
+    enum: [200, 400, 800, 1600]
+
 additionalProperties: false
 
 required:
@@ -44,6 +49,7 @@ examples:
             compatible = "maxim,max30100";
             reg = <0x57>;
             maxim,led-current-microamp = <24000 50000>;
+            maxim,pulse-width-us = <1600>;
             interrupt-parent = <&gpio1>;
             interrupts = <16 2>;
         };
-- 
2.43.0