AD4170-4 backport to main#3190
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nunojsa merged 12 commits intoanalogdevicesinc:mainfrom Mar 26, 2026
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Squashed commits with adaptations for kernel 6.12 with the patches for each respective functionality. Added a brief "tag" to commit messages indicating which patches were adapted. |
nunojsa
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@machschmitt can you rebase and take care about conflicts? |
Add device tree documentation for AD4170-4 and similar sigma-delta ADCs. The AD4170-4 is a 24-bit, multichannel, sigma-delta ADC. Acked-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/aa4b3be541c7b759560f8e0c5340a456cb2f3801.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The AD4170-4 is a multichannel, low noise, 24-bit precision sigma-delta analog to digital converter. The AD4170-4 design offers a flexible data acquisition solution with crosspoint multiplexed analog inputs, configurable ADC voltage reference inputs, ultra-low noise integrated PGA, digital filtering, wide range of configurable output data rates, internal oscillator and temperature sensor, four GPIOs, and integrated features for interfacing with load cell weigh scales, RTD, and thermocouple sensors. Add basic support for the AD4170-4 ADC with the following features: - Single-shot read. - Analog front end PGA configuration. - Differential and pseudo-differential input configuration. Signed-off-by: Ana-Maria Cusco <ana-maria.cusco@analog.com> Co-developed-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/ce3fd150bd63a2aed6eb6fe59aad6d60c0f9fb67.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support for ADC calibration gain configuration. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/ea8d07cad9b7b6106f0b5664c403ed080b362a6b.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support for ADC calibration bias/offset configuration. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/f240fce693d62ec8d587885074bf540e01919b31.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
…pport Add support for sinc3, sinc5, and averaged sinc5 digital filters along with sample frequency configuration. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/31f4226b4172b0bbb26daa054b74b25b1966c7b2.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Extend the AD4170-4 driver to allow buffered data capture in continuous read mode. In continuous read mode, the chip skips the instruction phase and outputs just ADC sample data, enabling faster sample rates to be reached. The internal channel sequencer always starts sampling from channel 0 and channel 0 must be enabled if more than one channel is selected for data capture. The scan mask validation callback checks if the aforementioned condition is met. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/10ed544d31aa86eb40f93ea947f151d3d9827952.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add timestamp channel allowing to record the moment at which ADC samples are captured in buffered read mode. [marcelo.schmitt@analog.com: Adapt to use iio_push_to_buffers_with_timestamp()] Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/e0af7e5424898bee0f3edfbb017133624efc169d.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The AD4170-4 chip can use an externally supplied clock at the XTAL2 pin, or an external crystal connected to the XTAL1 and XTAL2 pins. Alternatively, the AD4170-4 can provide its 16 MHz internal clock at the XTAL2 pin. In addition, the chip has a programmable clock divider that allows dividing the external or internal clock frequency, however, control for that is not provided in this patch. Extend the AD4170-4 driver so it effectively uses the provided external clock, if any, or supplies its own clock as a clock provider. Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/68697c7613b1a69d752e541caef28d08b3e59bc1.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The AD4170-4 has four multifunctional pins that can be used as GPIOs. The GPIO functionality can be accessed when the AD4170-4 chip is not busy performing continuous data capture or handling any other register read/write request. Also, the AD4170-4 does not provide any interrupt based on GPIO pin states so AD4170-4 GPIOs can't be used as interrupt sources. Implement gpio_chip callbacks to make AD4170-4 GPIO pins controllable through the gpiochip interface. [marcelo.schmitt@analog.com: Adapted with 6.12 backport needed changes] Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/e031189d4b7e20cf02dd13220ab1ddf4798760c2.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The AD4170-4 has an internal temperature sensor that can be read using the ADC. Whenever possible, configure an IIO channel to provide the chip's temperature. Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/71ac994060cf79a6c49f39b0c7d04c6c9cbbab00.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
…D sens The AD4170-4 design provides features to aid interfacing with weigh scales, thermocouples, and RTD sensors, which are set up with additional circuitry for proper sensor operation. A key characteristic of those sensors is that the circuit they are in must be excited with a single, a pair, or two pairs of signals. The external circuit can be excited either by a voltage supply or by AD4170-4 excitation signals. The sensor can then be read through a different pair of lines that are connected to the AD4170-4 ADC. Extend the ad4170-4 driver to handle external circuit sensors. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com> Link: https://patch.msgid.link/52686943040ecad34cc89833d4d5d37f1a51f412.1751895245.git.marcelo.schmitt@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Automatically imply ADF4170_4. Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
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PR Description
Backport ad4170-4 driver from upstream IIO tree.
Last 4 commits adapt the upstream driver to kernel 6.12.
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