The documentation is erroneously stating that spi-cpha is required, and
the example is erroneously setting both spi-cpol and spi-cpha. According
to the datasheet, only cpol should be set.
On zedboard for instance, setting the devicetree as in the example will
simply not work.
Fixes: 416f882c3b40 ("dt-bindings: iio: adc: Migrate AD7606 documentation to yaml")
Fixes: 6e33a125df66 ("dt-bindings: iio: adc: Add docs for AD7606 ADC")
Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
Signed-off-by: Guillaume Stols <gstols@xxxxxxxxxxxx>
---
Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
index bec7cfba52a7..47081c79a1cf 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7606.yaml
@@ -39,6 +39,11 @@ properties:
"#size-cells":
const: 0
+ # According to the datasheet, "Data is clocked in from SDI on the falling
+ # edge of SCLK, while data is clocked out on DOUTA on the rising edge of
+ # SCLK". Also, even if not stated textually in the datasheet, it is made
+ # clear on the diagrams that sclk idles at high. Subsequently, in case SPI
+ # interface is used, the correct way is to only set spi-cpol.
spi-cpha: true
spi-cpol: true
@@ -168,7 +173,6 @@ patternProperties:
required:
- compatible
- reg
- - spi-cpha
- avcc-supply
- vdrive-supply
- interrupts
@@ -255,7 +259,6 @@ examples:
reg = <0>;
spi-max-frequency = <1000000>;
spi-cpol;
- spi-cpha;
avcc-supply = <&adc_vref>;
vdrive-supply = <&vdd_supply>;
@@ -288,7 +291,6 @@ examples:
spi-max-frequency = <1000000>;
spi-cpol;
- spi-cpha;
avcc-supply = <&adc_vref>;
vdrive-supply = <&vdd_supply>;
--
2.34.1
