linux.git/include/linux/iio, branch v6.17 Linux kernel source tree iio: adc: ad_sigma_delta: add SPI offload support 2025-07-13T14:36:25+00:00 David Lechner dlechner@baylibre.com 2025-07-01T21:37:59+00:00 219da3ea842a156e5808176e11db256db9798f6c Add SPI offload support to the ad_sigma_delta module. When the SPI controller has SPI offload capabilities, the module will now use that for buffered reads instead of the RDY interrupt trigger. Drivers that use the ad_sigma_delta module will have to opt into this by setting supports_spi_offload since each driver will likely need additional changes before SPI offload can be used. This will allow us to gradually enable SPI offload support for each driver. Signed-off-by: David Lechner <dlechner@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-11-42abb83e3dac@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add SPI offload support to the ad_sigma_delta module.

When the SPI controller has SPI offload capabilities, the module will
now use that for buffered reads instead of the RDY interrupt trigger.

Drivers that use the ad_sigma_delta module will have to opt into this
by setting supports_spi_offload since each driver will likely need
additional changes before SPI offload can be used. This will allow us
to gradually enable SPI offload support for each driver.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-11-42abb83e3dac@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: adc: ad_sigma_delta: use spi_optimize_message() 2025-07-13T14:36:25+00:00 David Lechner dlechner@baylibre.com 2025-07-01T21:37:56+00:00 db63e45a7da0678652c69f7cbed2cbf2a9922b39 Use spi_optimize_message() to improve the performance of buffered reads. By setting up the SPI message and pre-optimizing it in the buffer postenable callback, we can reduce overhead during each sample read. A rough estimate shows that this reduced the CPU usage of the interrupt handler thread from 22% to 16% using an EVAL-AD4112ARDZ board on a DE10-Nano (measuring a single channel at the default 6.2 kHz sample rate). Signed-off-by: David Lechner <dlechner@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-8-42abb83e3dac@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Use spi_optimize_message() to improve the performance of buffered reads.

By setting up the SPI message and pre-optimizing it in the buffer
postenable callback, we can reduce overhead during each sample read.

A rough estimate shows that this reduced the CPU usage of the interrupt
handler thread from 22% to 16% using an EVAL-AD4112ARDZ board on a
DE10-Nano (measuring a single channel at the default 6.2 kHz sample
rate).

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-8-42abb83e3dac@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: adc: ad_sigma_delta: use u8 instead of uint8_t 2025-07-13T14:36:25+00:00 David Lechner dlechner@baylibre.com 2025-07-01T21:37:51+00:00 11d58620dfd0c52b0c49b04d28707c7a5a2d00ae Replace uint8_t with u8 in the ad_sigma_delta driver. Technically, uint8_t comes from the C standard library, while u8 is a Linux kernel type. Since we don't use the C standard library in the kernel, we should use the kernel types instead. There is also one instance where int64_t is replaced with s64. Signed-off-by: David Lechner <dlechner@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-3-42abb83e3dac@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Replace uint8_t with u8 in the ad_sigma_delta driver.

Technically, uint8_t comes from the C standard library, while u8 is a
Linux kernel type. Since we don't use the C standard library in the
kernel, we should use the kernel types instead.

There is also one instance where int64_t is replaced with s64.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-3-42abb83e3dac@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: backend: update iio_backend_oversampling_ratio_set 2025-06-26T18:32:51+00:00 Pop Ioan Daniel pop.ioan-daniel@analog.com 2025-06-05T15:09:40+00:00 97e6882ed1a16cd22184127abf2bc9b8202f37e0 Add chan parameter to iio_backend_oversampling_ratio_set() to allow for contexts where the channel must be specified. Modify all existing users. Reviewed-by: David Lechner <dlechner@baylibre.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@analog.com> Link: https://patch.msgid.link/20250605150948.3091827-3-pop.ioan-daniel@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add chan parameter to iio_backend_oversampling_ratio_set() to allow
for contexts where the channel must be specified. Modify all
existing users.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@analog.com>
Link: https://patch.msgid.link/20250605150948.3091827-3-pop.ioan-daniel@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: cros_ec_sensors: add cros_ec_activity driver 2025-06-26T18:32:51+00:00 Gwendal Grignou gwendal@chromium.org 2025-06-04T05:39:03+00:00 c430955d0cb87fb7c6b186e457cb3beca4a9c89a ChromeOS EC can report activity information derived from the accelerometer: - Reports on-body/off-body as a proximity event. - Reports significant motion as an activity event. This new sensor is a virtual sensor, included only when the EC firmware is compiled with the appropriate module. Signed-off-by: Gwendal Grignou <gwendal@google.com> Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://patch.msgid.link/20250604053903.1376465-1-gwendal@google.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
ChromeOS EC can report activity information derived from the
accelerometer:
- Reports on-body/off-body as a proximity event.
- Reports significant motion as an activity event.

This new sensor is a virtual sensor, included only when the EC firmware
is compiled with the appropriate module.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20250604053903.1376465-1-gwendal@google.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: core: add ADC delay calibration definition 2025-06-09T06:45:37+00:00 Angelo Dureghello adureghello@baylibre.com 2025-06-06T14:19:17+00:00 342c52dde2f031add61ddeaced9c100f88e04d09 ADCs as ad7606 implement a phase calibration as a delay. Add such definition, needed for ad7606. Signed-off-by: Angelo Dureghello <adureghello@baylibre.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20250606-wip-bl-ad7606-calibration-v9-2-6e014a1f92a2@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
ADCs as ad7606 implement a phase calibration as a delay. Add such
definition, needed for ad7606.

Signed-off-by: Angelo Dureghello <adureghello@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250606-wip-bl-ad7606-calibration-v9-2-6e014a1f92a2@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: backend: add support for number of lanes 2025-06-09T06:45:34+00:00 Antoniu Miclaus antoniu.miclaus@analog.com 2025-05-16T08:26:23+00:00 5ef4cc6d2414d115cf09a6a33c3155f12e58a27d Add iio backend support for number of lanes to be enabled. Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Link: https://patch.msgid.link/20250516082630.8236-4-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add iio backend support for number of lanes to be enabled.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250516082630.8236-4-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: backend: add support for data alignment 2025-06-09T06:45:34+00:00 Antoniu Miclaus antoniu.miclaus@analog.com 2025-05-16T08:26:22+00:00 995fd6e002b0d1ac435faed68005585906467e92 Add backend support for staring the capture synchronization. When activated, it initates a proccess that aligns the sample's most significant bit (MSB) based solely on the captured data, without considering any other external signals. Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Link: https://patch.msgid.link/20250516082630.8236-3-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add backend support for staring the capture synchronization.
When activated, it initates a proccess that aligns the sample's most
significant bit (MSB) based solely on the captured data, without
considering any other external signals.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250516082630.8236-3-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: backend: add support for filter config 2025-06-09T06:45:34+00:00 Antoniu Miclaus antoniu.miclaus@analog.com 2025-05-16T08:26:21+00:00 dc38441890ec0c54d032395ea9c365a4307185fa Add backend support for digital filter type selection. This setting can be adjusted within the IP cores interfacing devices. The IP core can be configured based on the state of the actual digital filter configuration of the part. Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Link: https://patch.msgid.link/20250516082630.8236-2-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add backend support for digital filter type selection.

This setting can be adjusted within the IP cores interfacing devices.

The IP core can be configured based on the state of the actual
digital filter configuration of the part.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250516082630.8236-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: introduce IIO_DECLARE_BUFFER_WITH_TS macros 2025-05-21T13:20:31+00:00 David Lechner dlechner@baylibre.com 2025-05-07T20:42:41+00:00 63fc53526d3090b27bd06bb43b92e8bc85f46fb1 Add new macros to help with the common case of declaring a buffer that is safe to use with iio_push_to_buffers_with_ts(). This is not trivial to do correctly because of the alignment requirements of the timestamp. This will make it easier for both authors and reviewers. To avoid double __align() attributes in cases where we also need DMA alignment, add a 2nd variant IIO_DECLARE_DMA_BUFFER_WITH_TS(). Reviewed-by: Nuno Sá <nuno.sa@analog.com> Signed-off-by: David Lechner <dlechner@baylibre.com> Link: https://patch.msgid.link/20250507-iio-introduce-iio_declare_buffer_with_ts-v6-2-4aee1b9f1b89@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> 
Add new macros to help with the common case of declaring a buffer that
is safe to use with iio_push_to_buffers_with_ts(). This is not trivial
to do correctly because of the alignment requirements of the timestamp.
This will make it easier for both authors and reviewers.

To avoid double __align() attributes in cases where we also need DMA
alignment, add a 2nd variant IIO_DECLARE_DMA_BUFFER_WITH_TS().

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250507-iio-introduce-iio_declare_buffer_with_ts-v6-2-4aee1b9f1b89@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>