From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
stable@vger.kernel.org, kernel@pengutronix.de,
linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
devicetree@vger.kernel.org, "Andy Shevchenko" <andy@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"David Jander" <david@protonic.nl>
Subject: Re: [PATCH v5 01/13] iio: dac: ds4424: reject -128 RAW value
Date: Wed, 4 Feb 2026 16:13:59 +0200 [thread overview]
Message-ID: <aYNUJyASwD67oOcN@smile.fi.intel.com> (raw)
In-Reply-To: <20260204140045.390677-2-o.rempel@pengutronix.de>
On Wed, Feb 04, 2026 at 03:00:33PM +0100, Oleksij Rempel wrote:
> The DS442x DAC uses sign-magnitude encoding, so -128 cannot be represented
> in hardware (7-bit magnitude).
>
> Previously, passing -128 resulted in a truncated value that programmed
> 0mA (magnitude 0) instead of the expected maximum negative current,
> effectively failing silently.
>
> Reject -128 to avoid producing the wrong current.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
(as agreed to use S8_* limits for now)
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-02-04 14:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260204140045.390677-1-o.rempel@pengutronix.de>
2026-02-04 14:00 ` [PATCH v5 01/13] iio: dac: ds4424: reject -128 RAW value Oleksij Rempel
2026-02-04 14:13 ` Andy Shevchenko [this message]
2026-02-05 20:14 ` Jonathan Cameron
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