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

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Message-ID: <20251004015623.7019-2-raskar.shree97@gmail.com>
Date: Sat,  4 Oct 2025 07:26:22 +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 1/2] dt-bindings: iio: max30100: Add pulse-width property

The MAX30100 sensor supports multiple LED pulse widths (200us, 400us,
800us, 1600us). These settings affect measurement resolution and power
consumption. Until now, the driver always defaulted to 1600us.

Introduce a new device tree property `maxim,pulse-width` that allows
users to select the desired pulse width in microseconds from device
tree.

Valid values are: 200, 400, 800, 1600.

This prepares for driver changes that read this property and configure
the SPO2 register accordingly.

Signed-off-by: Shrikant Raskar <raskar.shree97@...il.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..55aaf2ff919b 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:
+    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 = <1600>;
             interrupt-parent = <&gpio1>;
             interrupts = <16 2>;
         };
-- 
2.43.0