linux-kernel - [PATCH v5 1/2] dt-bindings: iio: light: bh1750: Add reset-gpios property

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Message-ID: <20250321161609.3662-1-sergio@pereznus.es>
Date: Fri, 21 Mar 2025 17:16:08 +0100
From: Sergio Perez <sergio@...eznus.es>
To: Tomasz Duszynski <tduszyns@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Sergio Perez <sergio@...eznus.es>
Subject: [PATCH v5 1/2] dt-bindings: iio: light: bh1750: Add reset-gpios property

Some BH1750 sensors require a hardware reset via GPIO before they can
be properly detected on the I2C bus. Add a new reset-gpios property
to the binding to support this functionality.

The reset-gpios property allows specifying a GPIO that will be toggled
during driver initialization to reset the sensor.

Signed-off-by: Sergio Perez <sergio@...eznus.es>
---
Revision history:
v4 => v5:
 - Update description to reflect "active low" on reset signal as indicated by Krzysztof Kozlowski
 - Update description to clarify what pin of sensor is used to do reset (DVI) as mentioned by Krzysztof Kozlowski
 - Edit example to be coherent with "active low" as informed by Krzysztof Kozlowski
 - Added necessary include on example
v3 => v4:
 - No changes
v2 => v3:
 - Split in two patches: dtbinding and code
 - Ensure list off mantainers following instructions by Krzysztof Kozlowski
 - Delete redundant details on description as suggested by Jonathan Cameron
 - Added related example to existing one as suggested by Jonathan Cameron
v1 => v2:
 - Ensure check tests as commented by Rob Herring
 - Fixes some whitespaces and end lines
---
 Documentation/devicetree/bindings/iio/light/bh1750.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/light/bh1750.yaml b/Documentation/devicetree/bindings/iio/light/bh1750.yaml
index 1a88b3c253d5..e388610d3741 100644
--- a/Documentation/devicetree/bindings/iio/light/bh1750.yaml
+++ b/Documentation/devicetree/bindings/iio/light/bh1750.yaml
@@ -24,6 +24,10 @@ properties:
   reg:
     maxItems: 1
 
+  reset-gpios:
+    description: GPIO connected to the DVI reset pin (active low)
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -36,9 +40,12 @@ examples:
       #address-cells = <1>;
       #size-cells = <0>;
 
+      #include <dt-bindings/gpio/gpio.h>
+
       light-sensor@23 {
         compatible = "rohm,bh1750";
         reg = <0x23>;
+        reset-gpios = <&gpio2 17 GPIO_ACTIVE_LOW>;
       };
     };
 
-- 
2.43.0