| Message ID | 20240703160535.2277871-6-olivier.moysan@foss.st.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | iio: adc: dfsdm: add scaling support | expand |
On Wed, 03 Jul 2024 18:05:30 +0200, Olivier Moysan wrote: > 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> > --- > .../iio/adc/sigma-delta-modulator.yaml | 24 +++++++++++++++++-- > 1 file changed, 22 insertions(+), 2 deletions(-) > My bot found errors running 'make dt_binding_check' on your patch: yamllint warnings/errors: ./Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml:38:5: [warning] wrong indentation: expected 6 but found 4 (indentation) dtschema/dtc warnings/errors: Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.example.dtb: /example-0/ads1201_0: failed to match any schema with compatible: ['ti,ads1201'] doc reference errors (make refcheckdocs): See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20240703160535.2277871-6-olivier.moysan@foss.st.com The base for the series is generally the latest rc1. A different dependency should be noted in *this* patch. If you already ran 'make dt_binding_check' and didn't see the above error(s), then make sure 'yamllint' is installed and dt-schema is up to date: pip3 install dtschema --upgrade Please check and re-submit after running the above command yourself. Note that DT_SCHEMA_FILES can be set to your schema file to speed up checking your schema. However, it must be unset to test all examples with your schema.
On Wed, Jul 03, 2024 at 06:05:30PM +0200, Olivier Moysan wrote: > 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> > --- > .../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: Don't need 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>; Don't you need some link between the nodes? > }; > -- > 2.25.1 >
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>; };
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> --- .../iio/adc/sigma-delta-modulator.yaml | 24 +++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-)