linux-kernel - Re: [PATCH v2 0/4] iio: adc: ad4080: add support for AD4880 dual-channel ADC

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Message-ID: <aYiGj_TYelvJdVaR@smile.fi.intel.com>
Date: Sun, 8 Feb 2026 14:50:23 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc: 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 0/4] iio: adc: ad4080: add support for AD4880
 dual-channel ADC

On Fri, Feb 06, 2026 at 06:07:12PM +0200, Antoniu Miclaus wrote:
> Add support for the AD4880, a dual-channel 20-bit 40MSPS SAR ADC from
> the same family as AD4080.
> 
> The AD4880 has two independent ADC channels, each with its own SPI
> configuration interface and LVDS data output. The driver uses
> spi_new_ancillary_device() for the second channel's SPI and requires
> two io-backend instances for the data interfaces.

I believe there is a better approach, what you need is rather a flag
to SPI core to tell that this is the device with shared CS.

-- 
With Best Regards,
Andy Shevchenko