linux-kernel - Re: [PATCH v3 0/8] iio: dac: ds4424: add DS4402/DS4404 support and scale

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Message-ID: <aXqLgDWFysW5bW37@smile.fi.intel.com>
Date: Thu, 29 Jan 2026 00:19:44 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	David Jander <david@...tonic.nl>
Subject: Re: [PATCH v3 0/8] iio: dac: ds4424: add DS4402/DS4404 support and
 scale

On Wed, Jan 28, 2026 at 04:38:16PM +0100, Oleksij Rempel wrote:
> This series extends the ds4424 IIO DAC driver and its devicetree binding
> to support the DS4402 and DS4404 current DAC variants.
> 
> DS440x devices share the same register map as DS442x but use a different
> resolution (5-bit vs 7-bit) and a different full-scale current formula.
> The full-scale current depends on external Rfs resistors connected to
> the FS pins, so a new optional DT property is added to provide the
> per-channel Rfs values and allow the driver to report a correct IIO
> SCALE (mA/step).
> 
> While adding DS440x support, a few related issues were addressed:
> - Port to regmap
> - Reject -128 in RAW writes on DS442x, which cannot be represented with
>   sign-magnitude encoding and could silently program an unintended
>   output.
> - Preserve preconfigured values on probe.
> - Ratelimit read error logging and use device context.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
for patches 1,2,3,6, and 8.

-- 
With Best Regards,
Andy Shevchenko