linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: adc: Add ROHM BD79100G

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Message-ID: <20250513-coconut-reconfirm-b90590efeb45@spud>
Date: Tue, 13 May 2025 15:39:11 +0100
From: Conor Dooley <conor@...nel.org>
To: Matti Vaittinen <mazziesaccount@...il.com>
Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: adc: Add ROHM BD79100G

On Tue, May 13, 2025 at 11:26:27AM +0300, Matti Vaittinen wrote:
> The ROHM BD79100G is a 12-bit ADC which can be read over SPI. Device has
> no MOSI pin. ADC results can be read from MISO by clocking in 16 bits.
> The 4 leading bits will be zero, last 12 containig the data.

I think it is probably worth mentioning why a rohm device is going into
this binding (clone?) and that the 12-bit thing is a differentiator that
is why you're not using a fallback.

> 
> Device has only VCC supply pin, which acts also as a VFS, determining the
> voltage for full 12-bits. Specifying it is mandatory.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> ---
>  Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
> index 44c671eeda73..10fb6e14c2d0 100644
> --- a/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7476.yaml
> @@ -46,6 +46,7 @@ properties:
>        - ti,ads7867
>        - ti,ads7868
>        - lltc,ltc2314-14
> +      - rohm,bu79100g
>  
>    reg:
>      maxItems: 1
> @@ -96,6 +97,7 @@ allOf:
>                - ti,adc121s
>                - ti,ads7866
>                - ti,ads7868
> +              - rohm,bu79100g
>      then:
>        required:
>          - vcc-supply
> -- 
> 2.49.0
> 



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