Add adi,sync-in-spi property to enable synchronization over SPI.
This should be used in the case when the GPIO cannot provide a
pulse synchronous with the base MCLK signal.
User can choose between SPI, GPIO synchronization or neither of them,
but only if a external pulse can be provided, for example, by another
device in a multidevice setup.
Signed-off-by: Jonathan Santos <Jonathan.Santos@xxxxxxxxxx>
---
.../bindings/iio/adc/adi,ad7768-1.yaml | 24 ++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
index 3ce59d4d065f..55cec27bfe60 100644
--- a/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7768-1.yaml
@@ -47,6 +47,15 @@ properties:
in any way, for example if the filter decimation rate changes.
As the line is active low, it should be marked GPIO_ACTIVE_LOW.
+ adi,sync-in-spi:
+ description:
+ Enables synchronization of multiple devices over SPI. This property is
+ used when a signal synchronous to the base MCLK signal cannot be provided
+ via GPIO. It requires the SYNC_OUT pin to be connected to the SYNC_IN pin
+ on the ADC. In the case of multiple devices, the SYNC_OUT pin of one device
+ should be routed to the SYNC_IN pins of the other devices.
+ type: boolean
+
reset-gpios:
maxItems: 1
@@ -65,7 +74,6 @@ required:
- vref-supply
- spi-cpol
- spi-cpha
- - adi,sync-in-gpios
patternProperties:
"^channel@([0-9]|1[0-5])$":
@@ -89,6 +97,20 @@ patternProperties:
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
+ # adi,sync-in-gpios and adi,sync-in-spi are mutually exclusive (neither is also valid)
+ - if:
+ required:
+ - adi,sync-in-gpios
+ then:
+ properties:
+ adi,sync-in-spi: false
+ - if:
+ required:
+ - adi,sync-in-spi
+ then:
+ properties:
+ adi,sync-in-gpios: false
+
unevaluatedProperties: false
examples:
--
2.34.1
