Support ROHM BD79124 ADC. This series adds also couple of IIO ADC helper functions for parsing the channel information from the device tree. There are also two helpers included for counting number of firmware child nodes with a specific name. Series does also convert couple of drivers to use these helpers. The rzg2l_adc and the sun20i-gpadc are converted to use the new ADC helper. The gianfar driver under net is added as an RFC patch to use the newly added firmware child node counting function. There has been some discussion about how useful these ADC helpers are, and whether they should support also differential and single ended channel configurations. This version does not include support for those - with the benefit of reduced complexity and easier to use API. patch 6/10 is small simplification for the ti-ads7924, and it can be taken independently from the rest of the series. NOTE: Patches 4...6 and the patch 10 are untested as I lack of relevant HW. They have been compile tested only. The ROHM BD79124 ADC itself is quite usual stuff. 12-bit, 8-channel ADC with threshold monitoring. Except that: - each ADC input pin can be configured as a general purpose output. - manually starting an ADC conversion and reading the result would require the I2C _master_ to do clock stretching(!) for the duration of the conversion... Let's just say this is not well supported. - IC supports 'autonomous measurement mode' and storing latest results to the result registers. This mode is used by the driver due to the "peculiar" I2C when doing manual reads. Furthermore, the ADC uses this continuous autonomous measuring, and the IC keeps producing new 'out of window' IRQs if measurements are out of window - the driver disables the event for 1 seconds when sending it to user. This prevents generating storm of events Revision history: v4 => v5: Fixes as per various review comments. Most notably: - Drop the patch making the TI's ADC driver to respect device tree. - Add (RFC) patch converting gianfar driver to use new name child-node counting API as suggested by Andy. - Add fwnode_get_child_node_count_named() as suggested by Rob. Changes which were not proposed by reviewers: - rebase to v6.14-rc5 - Do not include all recipients to all of the patches. More accurate changelog in individual patches. v3 => v4: - Drop the ADC helper support for differential channels - Drop the ADC helper for getting only channel IDs by fwnode. - "Promote" the function counting the number of child nodes with a specific name to the property.h (As suggested by Jonathan). - Add ADC helpers to a namespace. - Rebase on v6.14-rc3 - More minor changes described in individual patches. v2 => v3: - Restrict BD79124 channel numbers as suggested by Conor and add Conor's Reviewed-by tag. - Support differential and single-ended inputs - Convert couple of existing drivers to use the added ADC helpers - Minor fixes based on reviews Link to v2: https://lore.kernel.org/all/cover.1738761899.git.mazziesaccount@xxxxxxxxx/ RFC v1 => v2: - Drop MFD and pinmux. - Automatically re-enable events after 1 second. - Export fwnode parsing helpers for finding the ADC channels. --- Matti Vaittinen (10): dt-bindings: ROHM BD79124 ADC/GPO property: Add functions to count named child nodes iio: adc: add helpers for parsing ADC nodes iio: adc: rzg2l_adc: Use adc-helpers iio: adc: sun20i-gpadc: Use adc-helpers iio: adc: ti-ads7924 Drop unnecessary function parameters iio: adc: Support ROHM BD79124 ADC MAINTAINERS: Add IIO ADC helpers MAINTAINERS: Add ROHM BD79124 ADC/GPO net: gianfar: Use device_get_child_node_count_named() .../bindings/iio/adc/rohm,bd79124.yaml | 114 ++ MAINTAINERS | 12 + drivers/base/property.c | 57 + drivers/iio/adc/Kconfig | 17 + drivers/iio/adc/Makefile | 3 + drivers/iio/adc/industrialio-adc.c | 82 ++ drivers/iio/adc/rohm-bd79124.c | 1108 +++++++++++++++++ drivers/iio/adc/rzg2l_adc.c | 38 +- drivers/iio/adc/sun20i-gpadc-iio.c | 38 +- drivers/iio/adc/ti-ads7924.c | 7 +- drivers/net/ethernet/freescale/gianfar.c | 17 +- include/linux/iio/adc-helpers.h | 27 + include/linux/property.h | 4 + 13 files changed, 1462 insertions(+), 62 deletions(-) create mode 100644 Documentation/devicetree/bindings/iio/adc/rohm,bd79124.yaml create mode 100644 drivers/iio/adc/industrialio-adc.c create mode 100644 drivers/iio/adc/rohm-bd79124.c create mode 100644 include/linux/iio/adc-helpers.h base-commit: 7eb172143d5508b4da468ed59ee857c6e5e01da6 -- 2.48.1
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