From: Nicolas Frattaroli <frattaroli.nicolas@gmail.com>
To: Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] dt-bindings: iio: dac: add mcp4822
Date: Wed, 05 Apr 2023 16:17:54 +0200 [thread overview]
Message-ID: <4357039.nDxAD4yF8u@archbook> (raw)
In-Reply-To: <748c4391-1c8c-8fc2-cef9-6091512c77ef@linaro.org>
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
next prev parent reply other threads:[~2023-04-05 14:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-05 14:01 [PATCH 0/4] Add MCP48XX bindings and driver support Nicolas Frattaroli
2023-04-05 14:01 ` [PATCH 1/4] dt-bindings: iio: dac: mcp4922: add vdd-supply property Nicolas Frattaroli
2023-04-09 20:52 ` Michael Welling
2023-04-05 14:01 ` [PATCH 2/4] iio: dac: mcp4922: get and enable vdd regulator Nicolas Frattaroli
2023-04-05 14:21 ` Lars-Peter Clausen
2023-04-07 17:46 ` Jonathan Cameron
2023-04-07 17:44 ` Jonathan Cameron
2023-04-05 14:01 ` [PATCH 3/4] dt-bindings: iio: dac: add mcp4822 Nicolas Frattaroli
2023-04-05 14:10 ` Krzysztof Kozlowski
2023-04-05 14:17 ` Nicolas Frattaroli [this message]
2023-04-06 18:58 ` Krzysztof Kozlowski
2023-04-05 14:01 ` [PATCH 4/4] iio: dac: mcp4922: add support for mcp48xx series chips Nicolas Frattaroli
2023-04-05 14:18 ` Lars-Peter Clausen
2023-04-07 17:35 ` Jonathan Cameron
2023-04-07 17:40 ` Jonathan Cameron
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