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dt-bindings: iio: add backend support to sd modulator

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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@foss.st.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20240730084640.1307938-6-olivier.moysan@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Olivier Moysan
2024-07-30 10:46:35 +02:00
committed by Jonathan Cameron
parent b8f31b1d65
commit 281b4318be
1 changed files with 16 additions and 2 deletions
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Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml
+16 -2
View File
@@ -18,18 +18,32 @@ properties:
- sd-modulator
- ads1201
'#io-backend-cells':
const: 0
'#io-channel-cells':
const: 0
required:
- compatible
- '#io-channel-cells'
anyOf:
- required: ['#io-backend-cells']
- required: ['#io-channel-cells']
additionalProperties: false
examples:
- |
ads1202: adc {
// Backend binding example. SD modulator configured as an IIO backend device
ads1201_0: adc {
compatible = "sd-modulator";
#io-backend-cells = <0>;
};
- |
// Legacy binding example. SD modulator configured as an IIO channel provider
ads1201_1: adc {
compatible = "sd-modulator";
#io-channel-cells = <0>;
};