user/sven/linux.git/include/linux/iio, branch v6.18.1

iio: buffer-dma: support getting the DMA channel

2025-10-13T07:38:08Z

Implement the .get_dma_dev() callback for DMA buffers by returning the device that owns the DMA channel. This allows the core DMABUF infrastructure to properly map DMA buffers using the correct device, avoiding the need for bounce buffers on systems where memory is mapped above the 32-bit range. The function returns the DMA queue's device, which is the actual device responsible for DMA operations in buffer-dma implementations. Cc: stable@vger.kernel.org Reviewed-by: David Lechner Signed-off-by: Nuno Sá Signed-off-by: Jonathan Cameron

iio: buffer: support getting dma channel from the buffer

2025-10-13T07:38:08Z

Add a new buffer accessor .get_dma_dev() in order to get the struct device responsible for actually providing the dma channel. We cannot assume that we can use the parent of the IIO device for mapping the DMA buffer. This becomes important on systems (like the Xilinx/AMD zynqMP Ultrascale) where memory (or part of it) is mapped above the 32 bit range. On such systems and given that a device by default has a dma mask of 32 bits we would then need to rely on bounce buffers (to swiotlb) for mapping memory above the dma mask limit. In the process, add an iio_buffer_get_dma_dev() helper function to get the proper DMA device. Cc: stable@vger.kernel.org Reviewed-by: David Lechner Signed-off-by: Nuno Sá Signed-off-by: Jonathan Cameron

Merge tag 'iio-for-6.18a' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

2025-09-23T12:15:25Z

Jonathan writes: IIO: New device support, features and cleanup for 6.18 New device support ================== ad,ade9000 - New driver for this complex energy and power monitoring ADC. infineon,tlv493d - New driver for this 3D magnetic sensor. intel,dollar - New driver for this TI PMIC (part number unknown) marvel,88pm886 - Driver for this PMIC ADC. microchip,mcp9600 - Add explicit support for the mcp9601 which has some additional features over the mcp9600. rohm,bd79112 - New driver for this ADC / GPIO Chip. Features ======== Core - New helper to multiply data expressed in IIO types. - Add KUnit tests. - New IIO_ALTCURRENT type, similar to existing IIO_ALTVOLTAGE - Add some channel modifiers related to energy and power, such as reactive. adi,ad7124 - Support external clocks sources and output of the internal clocks. - Filter control. adi,ad7173 - Add filter support. Some fiddly interactions with other parameters on this device. adi,ad7779 - Add backend support which required control of the number of lanes used. liteon,ltr390 - Add runtime PM support. microchip,mcp9600 - Add support for different thermocouple types. Cleanup and minor fixes ======================= core - Switch info_mask fields to be unsigned. Not clear why they were ever signed. - Fix handling of negative channel scale in iio_convert_raw_to_processed() - Fix offset handling for channels without a scale attribute. - Improve the precision of scaling slightly. - Drop apparent handling of IIO_CHAN_INFO_PROCESSED for devices that don't have any such channels. various - Drop many pm_runtime_mark_last_busy() calls now pm_runtime_put_autosuspend() calls it internally. - Drop dev_err_probe() calls where the error code is hard coded as -ENOMEM as they don't do anything. - Drop dev_err() calls where the error code is -ENOMEM. This will reduce error prints, but memory failures generate a lot of messages anyway so unlikely we need these prints. current-sense-amplifier - Add #io-channels property this channel to be used by a consumer driver. adi,ad7124 - Fix incorrect clocks dt-binding property. - Make the mclk clock optional in DT - this is internal to the ADC so should never have been in he binding. - Fix up sample rate to comply with ABI. - Use read_avail() callback rather than opencoding similar. - Deploy guard() to clean up some lock handling. adi,ad7768 - Use devm_regulator_get_enable_read_voltage() to replace similar code. adi,ad7816 - Drop an unnecessary dev_set_drvdata() call as nothing uses the data. ad,adxl345 - Fix missing blank line before bullet list in documentation. arm,scmi - Use devm_kcalloc() for an array allocation rather than devm_kzalloc(). bosch,bmi270 - Match an ACPI ID seen in the wild. It is not spec compliant but we can't do much about that. bosch,bmp280 - Drop overly noisy dev_info() - Allow for sleeping gpio controllers. gogle,cros-ec - Drop unused location attribute that has been replaced by label. invense,icm42600 - Simplify the power management. - Use guard() to simplify some locking. maxim,max1238 - Add io-channel-cells property to dt-binding as there is an in tree consumer. microchip,mcp9600 - Specify a default value in dt-binding for the thermocouple type - General whitespace cleanup. samsung,exynos - Drop support for the S3C2410 including bindings, and touchscreen support as nothing else uses that. - Drop platform ID based binding as not used. st,vl53l0x - Fix returning the wrong variable in an error path. ti,pac1934 - Replace open coded devm_mutex_init(). xilinx,ams - Update maintainers entry. * tag 'iio-for-6.18a' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (178 commits) MAINTAINERS: Support ROHM BD79112 ADC iio: adc: Support ROHM BD79112 ADC/GPIO dt-bindings: iio: adc: ROHM BD79112 ADC/GPIO iio: pressure: bmp280: Use gpiod_set_value_cansleep() iio: pressure: bmp280: Remove noisy dev_info() iio: ABI: add filter types for ad7173 iio: adc: ad7173: support changing filter type iio: adc: ad7173: rename odr field iio: adc: ad7173: rename ad7173_chan_spec_ext_info iio: adc: Add driver for Marvell 88PM886 PMIC ADC dt-bindings: mfd: 88pm886: Add #io-channel-cells iio: ABI: document "sinc4+rej60" filter_type iio: adc: ad7124: add filter support iio: adc: ad7124: support fractional sampling_frequency iio: adc: ad7124: use guard(mutex) to simplify return paths iio: adc: ad7124: use read_avail() for scale_available iio: adc: ad7124: use clamp() iio: adc: ad7124: fix sample rate for multi-channel use Documentation: ABI: iio: add sinc4+lp docs: iio: add documentation for ade9000 driver ...

iio: add power and energy measurement modifiers

2025-09-13T12:47:19Z

Add new IIO modifiers to support power and energy measurement devices: Power modifiers: - IIO_MOD_ACTIVE: Real power consumed by the load - IIO_MOD_REACTIVE: Power that oscillates between source and load - IIO_MOD_APPARENT: Magnitude of complex power Signal quality modifiers: - IIO_MOD_RMS: Root Mean Square value Additionally adds: - IIO_CHAN_INFO_POWERFACTOR: Power factor channel info type for representing the ratio of active power to apparent power These modifiers enable proper representation of power measurement devices like energy meters and power analyzers. Signed-off-by: Antoniu Miclaus Signed-off-by: Jonathan Cameron

iio: consumers: Add an iio_multiply_value() helper function

2025-09-10T18:47:04Z

The channel-scale handling in iio_convert_raw_to_processed() in essence does the following: processed = raw * caller-provided-scale * channel-scale Which can also be written as: multiplier = raw * caller-provided-scale iio-value = channel-scale processed = multiplier * iio-value Where iio-value is a set of IIO_VAL_* type + val + val2 integers, being able to handle multiplication of iio-values like this is something which is useful to have in general and, as previous bugfixes to iio_convert_raw_to_processed() have shown, also tricky to implement. Split the iio-value multiplication code from iio_convert_raw_to_processed() out into a new iio_multiply_value() helper. This serves multiple purposes: 1. Having this split out allows writing a KUnit test for this. 2. Having this split out allows re-use to get better precision when scaling values in iio_read_channel_processed_scale(). Reviewed-by: Andy Shevchenko Signed-off-by: Hans de Goede Link: https://patch.msgid.link/20250831104825.15097-4-hansg@kernel.org Signed-off-by: Jonathan Cameron

iio: frequency: adf4350: Fix ADF4350_REG3_12BIT_CLKDIV_MODE

2025-08-31T15:46:36Z

The clk div bits (2 bits wide) do not start in bit 16 but in bit 15. Fix it accordingly. Fixes: e31166f0fd48 ("iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers") Signed-off-by: Michael Hennerich Signed-off-by: Nuno Sá Link: https://patch.msgid.link/20250829-adf4350-fix-v2-2-0bf543ba797d@analog.com Cc: Signed-off-by: Jonathan Cameron

iio: core: switch info_mask fields to unsigned long to match find_bit helpers

2025-08-25T10:07:17Z

for_each_set_bit()/find_*_bit() expect arrays of unsigned long (see include/linux/find.h), but industrialio-core passed const long * into iio_device_add_info_mask_type{,_avail}(). These masks are used purely as bit arrays and are populated via BIT() (1UL << n). Switch the info_mask_* fields and the corresponding function parameters to unsigned long so the types match the helpers. This removes sparse warnings about signedness mismatches (seen with 'make C=1' CF='-Wsparse-all') without changing behavior or struct layout. No functional change intended. Suggested-by: Jonathan Cameron Signed-off-by: Junjie Cao Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20250820004755.69627-1-junjie.cao@intel.com Signed-off-by: Jonathan Cameron

iio: fix iio_push_to_buffers_with_ts() typo

2025-08-16T10:57:05Z

Replace iio_push_to_buffer_with_ts() with iio_push_to_buffers_with_ts() in some documentation comments in iio.h. The latter is the correct name of the function, the former doesn't exist. Signed-off-by: David Lechner Link: https://patch.msgid.link/20250722-iio-fix-iio_push_to_buffer_with_ts-typo-v1-1-6ac9efb856d3@baylibre.com Signed-off-by: Jonathan Cameron

iio: adc: ad_sigma_delta: add SPI offload support

2025-07-13T14:36:25Z

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 Reviewed-by: Andy Shevchenko Reviewed-by: Nuno Sá Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-11-42abb83e3dac@baylibre.com Signed-off-by: Jonathan Cameron

iio: adc: ad_sigma_delta: use spi_optimize_message()

2025-07-13T14:36:25Z

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 Reviewed-by: Andy Shevchenko Reviewed-by: Nuno Sá Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-8-42abb83e3dac@baylibre.com Signed-off-by: Jonathan Cameron