[PATCH v2 02/14] dt-bindings: iio: accel: bosch,bma220 setup SPI clock mode

Petre Rodan
2025-09-10T07:58:09Z

Assert CPOL for a high-idle clock signal and CPHA for sampling on the
trailing (rising) edge.

Quoting from the datasheet:

"During the transitions on CSB, SCK must be high. SDI and SDO are driven
at the falling edge of SCK and should be captured at the rising edge of
SCK."

The sensor does not function with the default SPI clock mode.

Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro>
---
ChangeLog:
- split out from a bigger patch file
---
Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml b/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
index da047258aca3d84e8b2cbe92a9c98309236fe7ae..0e27ec74065acca611e63309d6ae889b8a3134ce 100644
--- a/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
+++ b/Documentation/devicetree/bindings/iio/accel/bosch,bma220.yaml
@@ -20,6 +20,9 @@ properties:
interrupts:
maxItems: 1

+ spi-cpha: true
+ spi-cpol: true
+
vdda-supply: true
vddd-supply: true
vddio-supply: true
@@ -44,6 +47,8 @@ examples:
compatible = "bosch,bma220";
reg = <0>;
spi-max-frequency = <2500000>;
+ spi-cpol;
+ spi-cpha;
interrupt-parent = <&gpio0>;
interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
};

--
2.49.1