The legacy sd modulator driver registers the sigma delta modulator as
an IIO channel provider. This implementation is not convenient when the
SD modulator has to be cascaded with another IIO device. The scaling
information is distributed across devices, which makes it difficult to
report consistent scaling data on IIO devices.
The solution is to expose these cascaded IIO devices as an aggregate
device, which report global scaling information.
Add IIO backend support to SD modulator to allow scaling information
management.
Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
---
.../iio/adc/sigma-delta-modulator.yaml | 24 +++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
index cab0d425eaa4..e34aa560da63 100644
--- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
@@ -18,18 +18,38 @@ properties:
- sd-modulator
- ads1201
+ '#io-backend-cells':
+ const: 0
+
'#io-channel-cells':
const: 0
+ reg:
+ maxItems: 1
+
+ vref-supply:
+ description: Phandle to the vref input analog reference voltage.
+
required:
- compatible
- - '#io-channel-cells'
+
+allOf:
+ - anyOf:
+ - required: ['#io-backend-cells']
+ - required: ['#io-channel-cells']
additionalProperties: false
examples:
- |
- ads1202: adc {
+ // Exemple1: SD modulator is an IIO backend device
+ ads1201_0 {
+ compatible = "ti,ads1201";
+ #io-backend-cells = <0>;
+ };
+
+ //Example2: SD modulator is an IIO channel provider
+ ads1201_1 {
compatible = "sd-modulator";
#io-channel-cells = <0>;
};
--
2.25.1
