From: Marcelo Schmitt <marcelo.schmitt@analog.com>
To: <linux-iio@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: <jic23@kernel.org>, <nuno.sa@analog.com>,
<Michael.Hennerich@analog.com>, <dlechner@baylibre.com>,
<andy@kernel.org>, <robh@kernel.org>, <krzk+dt@kernel.org>,
<conor+dt@kernel.org>, <julianbraha@gmail.com>,
<marcelo.schmitt1@gmail.com>
Subject: [PATCH v8 0/5] iio: adc: Add support for LTC2378 and similar ADCs
Date: Thu, 23 Jul 2026 16:51:46 -0300 [thread overview]
Message-ID: <cover.1784835663.git.marcelo.schmitt@analog.com> (raw)
This patch series adds support for LTC2378 and similar low noise, low power,
high speed, successive approximation register (SAR) ADCs. These ADCs are similar
among each other, varying mainly on the amount of precision bits, maximum sample
rate, and input configuration (either fully differential or pseudo-differential).
Patch 1 adds device tree documentation for LTC2378.
Patch 2 enables single-shot sample read with a GPIO connected to the LTC2378 CNV pin.
Patch 3 enables high-speed data captures with SPI offloading.
The setup is similar to AD4030, with a specialized PWM generator being used both
for SPI offload triggering and conversion start signaling.
Patch 4 enables running buffered data captures without SPI offloading.
Patch 5 recommends using voltageY-voltageZ ABI for differential parts.
Even though these parts are somewhat similar to AD4000, the wiring configuration
for LTC parts is different as well as the available HDL for high speed sample
rate mode. Because of that, I propose creating a new device driver for
supporting LTC2378-like devices.
Specifications can be found at:
https://www.analog.com/media/en/technical-documentation/data-sheets/233818fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236416fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236418f.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236716fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236718f.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236816f.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236818f.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/236918fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237016fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237616fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237618fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237620fb.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237716fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237718fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237720fb.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237816fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237818fa.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237820fb.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/237918fb.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/238016fb.pdf
Previous submissions:
v7: https://lore.kernel.org/linux-iio/cover.1784235595.git.marcelo.schmitt@analog.com/
v6: https://lore.kernel.org/linux-iio/cover.1783629101.git.marcelo.schmitt@analog.com/
v5: https://lore.kernel.org/linux-iio/cover.1783028033.git.marcelo.schmitt@analog.com/
v4: https://lore.kernel.org/linux-iio/cover.1782397418.git.marcelo.schmitt@analog.com/
v3: https://lore.kernel.org/linux-iio/cover.1781661028.git.marcelo.schmitt@analog.com/
v2: https://lore.kernel.org/linux-iio/cover.1779976379.git.marcelo.schmitt@analog.com/
v1: https://lore.kernel.org/linux-iio/cover.1779117444.git.marcelo.schmitt1@gmail.com/
Change log v7 -> v8:
[DT]
No changes in device tree doc.
[IIO]
- Updated channel macros to make up indexed IIO channels.
- Encourage differential voltage ABI usage [NEW PATCH].
- Simplified if/else to consecutive if statements on ltc2378_refin_setup().
- Picked up review tags.
With best regards,
Marcelo
Marcelo Schmitt (5):
dt-bindings: iio: adc: Add ltc2378
iio: adc: ltc2378: Add support for LTC2378-20 and similar ADCs
iio: adc: ltc2378: Enable high-speed data capture
iio: adc: ltc2378: Enable triggered buffer data capture
iio: ABI: Encourage differential voltage ABI usage
Documentation/ABI/testing/sysfs-bus-iio | 9 +-
.../bindings/iio/adc/adi,ltc2378.yaml | 170 ++++
MAINTAINERS | 8 +
drivers/iio/adc/Kconfig | 19 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ltc2378.c | 851 ++++++++++++++++++
6 files changed, 1054 insertions(+), 4 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ltc2378.yaml
create mode 100644 drivers/iio/adc/ltc2378.c
base-commit: aa58ecc73466d0cb8c418de98e2225490bf600e3
--
2.53.0
next reply other threads:[~2026-07-23 19:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-23 19:51 Marcelo Schmitt [this message]
2026-07-23 19:52 ` [PATCH v8 1/5] dt-bindings: iio: adc: Add ltc2378 Marcelo Schmitt
2026-07-23 19:52 ` [PATCH v8 2/5] iio: adc: ltc2378: Add support for LTC2378-20 and similar ADCs Marcelo Schmitt
2026-07-23 20:04 ` sashiko-bot
2026-07-23 19:52 ` [PATCH v8 3/5] iio: adc: ltc2378: Enable high-speed data capture Marcelo Schmitt
2026-07-23 20:13 ` sashiko-bot
2026-07-23 19:53 ` [PATCH v8 4/5] iio: adc: ltc2378: Enable triggered buffer " Marcelo Schmitt
2026-07-23 19:53 ` [PATCH v8 5/5] iio: ABI: Encourage differential voltage ABI usage Marcelo Schmitt
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