[v6,0/2] AD4130

AD4130-8 is an ultra-low power, high precision, measurement solution for
low bandwidth battery operated applications.

The fully integrated AFE (Analog Front-End) includes a multiplexer for up
to 16 single-ended or 8 differential inputs, PGA (Programmable Gain
Amplifier), 24-bit Sigma-Delta ADC, on-chip reference and oscillator,
selectable filter options, smart sequencer, sensor biasing and excitation
options, diagnostics, and a FIFO buffer.

V1 -> V2
 * add kernel version to ABI file
 * merge ABI patch into driver patch
 * make copyright header similar to other drivers
 * rearrange includes
 * use units.h defines where possible and add unit sufix to
   SOFT_RESET_SLEEP define
 * remove ending comma to last members of enums / lists
 * remove unused FILTER_MAX define
 * use BIT macro for PIN_FN_*
 * rearrange SETUP_SIZE definition
 * group bools in ad4130_state and ad4130_chan_info
 * put scale_tbls definition on one line
 * remove newline before reg size == 0 check
 * put mask used as value in a variable
 * remove useless ret = 0 assignment
 * make buffer attrs oneline
 * use for_each_set_bit in update_scan_mode
 * use if else for internal reference voltage error checking
 * inline reference voltage check
 * check number of vbias pins
 * remove .has_int_pin = false
 * remove avail_len for IIO_AVAIL_RANGE
 * remove useless enabled_channels check in unlink_slot
 * remove unused AD4130_RESET_CLK_COUNT define
 * only call fwnode_handle_put for child in case of error
 * default adi,reference-select to REFIN1
 * default adi,int-ref-en to false
 * of_irq_get_byname -> fwnode_irq_get_byname
 * P1 -> P2 as interrupt pin options
 * add missing comma in db3_freq_avail init
 * cast values to u64 to make math using units.h work
 * add datasheet reference to IRQ polarity
 * add comment about disabling channels in predisable
 * add part number prefix find_table_index
 * return voltage from get_ref_voltage
 * add datasheet reference for internal reference voltage selection
 * add comment explaining AIN and GPIO pin sharing
 * parse channel setup before parsing excitation pins
 * only validate excitation pin if value is not off
 * use FIELD_PREP for bipolar and int_ref_en
 * put devm_regmap_init call on one line
 * introduce a slot_info struct to contain setup_info for each slot
 * enable internal reference automatically if needed
 * decide mclk sel based on adi,ext-clk-freq and adi,int-clk-out
 * dt-bindings: use internal reference explicitly
 * dt-bindings: set type for adi,excitation-pin-0
 * dt-bindings: set $ref for adi,vbias-pins
 * dt-bindings: remove minItems from interrupts property
 * dt-bindings: remove adi,int-ref-en default value
 * dt-bindings: remove adi,bipolar default value
 * dt-bindings: inline adi,int-ref-en description
 * dt-bindings: default adi,reference-select to REFIN1
 * dt-bindings: clean up description for diff-channels and
   adi,reference-select
 * dt-bindings: add more text to interrupt-names description
 * dt-bindings: turn interrupt-names into a single string
 * dt-bindings: add maxItems to adi,vbias-pins

V2 -> V3
 * dt-bindings: add interrupt controller include to example
 * dt-bindings: remove $ref in diff-channels

V3 -> V4:
  * handle watermark value as number of datum
  * DOUT_OR_INT -> INT
  * AD4130_8_NAME -> AD4130_NAME
  * return early in case of failure when parsing fw channel
  * use IIO_DMA_MINALIGN for aligning buffer
  * add comments for fs_to_freq and freq_to_fs
  * remove support for other variants because of unavailability of model
    ids for future chip variants
  * remove support for db3 frequency because of inaccuracy when calculating
  * remove ternary where possible
  * refactor defines
  * dt-bindings: add unevaluatedProperties: true to channel node

V4 -> V5:
 * simplify get_ref_voltage function and move print statement to first user
 * inline statements not going over the 80 cols limit
 * simplify scale table filling
 * determine table length inside find table index macro
 * current_na -> tmp inside ad4130_parse_fw_setup
 * define full register set
 * put range register size definitions on one line
 * nanoamps -> nanoamp
 * adi,ext-clk-freq -> adi,ext-clk-freq-hz
 * return directly in ad4130_validate_vbias_pins
 * place comment regarding irq_trigger at assignment
 * inversed -> inverted inside irq_trigger comment
 * do not initialize int_clk_out
 * return directly in ad4130_validate_diff_channels
 * add () after reference to update_scan_mode in comment
 * use BIT() for channel offset
 * comment nitpicks on slot finding
 * return -EINVAL out of reg read for invalid sizes
 * place regmap at start of ad4130_state
 * place bools at the end of ad4130_setup_info
 * remove commas after terminators
 * dt-bindings: only allow one element in reg
 * dt-bindings: inline reg description
 * dt-bindings: remove $ref from adi,ext-clk-freq-hz

V5 -> V6:
 * bump KernelVersion
 * use IIO_DEVICE_ATTR_RO
 * nitpick inside mutex comment
 * use valid_mask for validating gpios
 * improve DMA comment

Cosmin Tanislav (2):
  dt-bindings: iio: adc: add AD4130
  iio: adc: ad4130: add AD4130 driver

 .../ABI/testing/sysfs-bus-iio-adc-ad4130      |   36 +
 .../bindings/iio/adc/adi,ad4130.yaml          |  259 +++
 MAINTAINERS                                   |    8 +
 drivers/iio/adc/Kconfig                       |   13 +
 drivers/iio/adc/Makefile                      |    1 +
 drivers/iio/adc/ad4130.c                      | 2014 +++++++++++++++++
 6 files changed, 2331 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
 create mode 100644 drivers/iio/adc/ad4130.c