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SubjectRe: [PATCH 3/4] dt-bindings: iio: dac: add mcp4822
Date
On Mittwoch, 5. April 2023 16:10:10 CEST Krzysztof Kozlowski wrote:
> On 05/04/2023 16:01, Nicolas Frattaroli wrote:
> > The MCP4801, MCP4802, MCP4811, MCP4812, MCP4821, and MCP4822 are
> > SPI digital-to-analog converters by Microchip, which have an
> > internal voltage reference, in contrast to the MCP49xx series
> > of DACs which use an external voltage reference.
> >
> > Thus, these need a separate binding, as to not overcomplicate
> > the mcp4922 binding.
>
> The difference is just one property which is very easy to handle - one
> allOf:if:then: with
> vref-supply: false
>
> Are there any other differences?
>
> Best regards,
> Krzysztof
>
>

In place of the external vref input, the MCP48XX series chips also
have a "SHDN" input, which is an active-low pin to disable the whole
chip and put it in a low power state. Future users of the bindings
may want to model this as being tied to some GPIO, though I haven't
done it here since I don't care about this feature.

Kind regards,
Nicolas Frattaroli


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