linux-kernel - [PATCH 01/10] dt-bindings: iio: accel: bosch,BMA220 improvements

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Message-ID: <20250901194742.11599-2-petre.rodan@subdimension.ro>
Date: Mon,  1 Sep 2025 22:47:27 +0300
From: Petre Rodan <petre.rodan@...dimension.ro>
To: linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Petre Rodan <petre.rodan@...dimension.ro>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: [PATCH 01/10] dt-bindings: iio: accel: bosch,BMA220 improvements

 - fix title typo
 - add optional watchdog setting that recovers the sensor from a stuck-low
 SDA condition
 - set correct SPI phase and polarity
 - interrupt on rising edge. the level-based interrupt that is being
 replaced was not actually implemented in the driver.

This set of changes should not negatively affect existing users.

Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
---
 .../bindings/iio/accel/bosch,bma220.yaml      | 20 +++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml b/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
index ec643de031a3..f71b2320b010 100644
--- a/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
+++ b/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/iio/accel/bosch,bma220.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#

-title: Bosch BMA220 Trixial Acceleration Sensor
+title: Bosch BMA220 Triaxial Acceleration Sensor

 maintainers:
   - Jonathan Cameron <Jonathan.Cameron@...wei.com>
@@ -20,6 +20,20 @@ properties:
   interrupts:
     maxItems: 1

+  bosch,watchdog:
+    description:
+      In order to prevent the built-in I2C slave to lock-up the I2C bus, a
+      watchdog timer is introduced. The WDT observes internal I2C signals and
+      resets the I2C interface if the bus is locked-up by the BMA220.
+      0 - off
+      1 - 1ms
+      2 - 10ms
+    enum: [0, 1, 2]
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  spi-cpha: true
+  spi-cpol: true
+
   vdda-supply: true
   vddd-supply: true
   vddio-supply: true
@@ -44,8 +58,10 @@ examples:
             compatible = "bosch,bma220";
             reg = <0>;
             spi-max-frequency = <2500000>;
+            spi-cpol;
+            spi-cpha;
             interrupt-parent = <&gpio0>;
-            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+            interrupts = <0 IRQ_TYPE_EDGE_RISING>;
         };
     };
 ...
--
2.49.1