linux-kernel - Re: [PATCH v2 4/4] iio: adc: ad4080: add support for AD4880 dual-channel ADC

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Message-ID: <95ba8b40af82959dac08d3576579eb1451f28364.camel@gmail.com>
Date: Sun, 08 Feb 2026 09:26:19 +0000
From: Nuno Sá <noname.nuno@...il.com>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>, Lars-Peter Clausen	
 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron	 <jic23@...nel.org>, David Lechner
 <dlechner@...libre.com>, Nuno Sá	 <nuno.sa@...log.com>,
 Andy Shevchenko <andy@...nel.org>, Rob Herring	 <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley	
 <conor+dt@...nel.org>, Olivier Moysan <olivier.moysan@...s.st.com>, Mark
 Brown	 <broonie@...nel.org>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, 	linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 4/4] iio: adc: ad4080: add support for AD4880
 dual-channel ADC

On Fri, 2026-02-06 at 18:07 +0200, Antoniu Miclaus wrote:
> Add support for the AD4880, a dual-channel 20-bit 40MSPS SAR ADC with
> integrated fully differential amplifiers (FDA).
> 
> The AD4880 has two independent ADC channels, each with its own SPI
> configuration interface. The driver uses spi_new_ancillary_device() to
> create an additional SPI device for the second channel, allowing both
> channels to share the same SPI bus with different chip selects.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---

...

> 
> -	ret = devm_iio_backend_enable(dev, st->back);
> +	/*
> +	 * Request buffer from the first backend only. For multi-channel
> +	 * devices (e.g., AD4880), all backends share a single IIO buffer
> +	 * as data from all ADC channels is interleaved into one stream.
> +	 */
> +	ret = devm_iio_backend_request_buffer(dev, st->back[0], indio_dev);
>  	if (ret)
>  		return ret;

Ahh that's a pitty. When I read the cover, I thought we would finally have a multi
buffer user so we could fix some issues with it :)

- Nuno Sá