[v5,0/6] Add driver for LTC2664 and LTC2672

Message

Paller, Kim Seer July 2, 2024, 3 a.m. UTC

Generalize the ABI documentation for DAC. The ABI defined for toggle mode
channels:

LTC2664:
  * out_voltageY_toggle_en
  * out_voltageY_raw0
  * out_voltageY_raw1
  * out_voltageY_symbol

LTC2672:
  * out_currentY_toggle_en
  * out_currentY_raw0
  * out_currentY_raw1
  * out_currentY_symbol

Default channels won't have any of the above ABIs. A channel is toggle capable
if the devicetree 'adi,toggle-mode' flag is set.

changes in v5:

ltc2664:
  * Removed return statement for error code in ltc2664_dac_code_read making it a
    void function.
  * Refactored voltage regulator error handling and logic setting for vref_mv.
  * Added Reviewed-by tag.

Bindings:
  * Added dac.yaml and generalized DAC common properties.
  * Modified ltc2664 binding adding constraints for the adi,manual-span-operation-config
    and output-range-microvolt properties.

changes in v4:

ltc2664:
  * Added comments for each field in the ltc2664_chan struct.
  * Changed global_toggle data type to bool and updated vref and rfsadj variables
    to include units.
  * Added 0,0 entry in ltc2672_span_helper to removed the id field from the
    ltc2664_chip_info struct.
  * Used mul_u64_u32_div helper function from linux/math64.h to avoid integer
    overflow during scale calculation.
  * Refactored code to use a single template for channel instead of separate
    channel arrays.
  * Used the devm_regulator_get_enable_read_voltage API for simplifying voltage
    retrieval.

ABI:
  sysfs-bus-iio:
    * Added commit message for the ABI changes.
  sysfs-bus-iio-dac:
    * Updated the description of toggle_en to clarify autonomous toggling.
    * Fixed inconsistent use of spacing and tabs.

Bindings:
  * Dropped Reviewed-by tag.
  * Updated the description for both bindings to include both 12-bit and 16-bit
    versions.

changes in v3:

ltc2664:
  * Added span sanity check for no match.
  * Initialized the variable 'span' to fix build warning.
  * Added Reported-by and Closes by tag.

ABI:
  * Modified descriptions to make it more generalize.
  * Removed MAINTAINERS file entry.

Bindings:
  * Changed clr-gpios to reset-gpios.
  * Added output range and reset code description for 'adi,manual-span-operation-config'
    property in ltc2664 binding.
  * Removed the $ref for 'adi,output-range-microamp' due to dt-schema warning
    in ltc2672 binding. Added Reported-by and Closes by tag.
  * Modified io-channels description and added maxItems constraint.

changes in v2:

ltc2664:
  * Updated struct ltc2664_chip_info to include device-specific data for scale,
    offset, measurement type, internal vref, manual span support, and rfsadj
    support.
  * Added a read-only extended info attribute powerdown_mode to indicate the
    state that the DAC output enters when the device is powered down.
  * Refactored code for setting the span into separate function and directly
    returning the span.
  * Adjusted memory allocation for st->iio_channels to include null terminator.
  * Spaces have been added after { and before }. Each pair of values is now
    placed on a separate line.

ABI:
  * Generalized the ABI documentation for DAC.
  * Added DAC 42kohm_to_gnd powerdown mode.

Bindings:
  * Created separate bindings for ltc2664 and ltc2672.
  * Added v-pos-supply and v-neg-supply regulator properties.
  * Renamed vref-supply to ref-supply based on the datasheet.
  * Added io-channels property and specifying the pin for multiplexer output.
  * Added vdd0-vdd4 supply properties for ltc2672, although they are not
    currently supported in the driver.
  * Changed clr-gpios description based on the datasheet.
  * Used 4 spaces for example indentation.


Kim Seer Paller (6):
  iio: ABI: Generalize ABI documentation for DAC
  iio: ABI: add DAC 42kohm_to_gnd powerdown mode
  dt-bindings: iio: dac: Generalize DAC common properties
  dt-bindings: iio: dac: Add adi,ltc2664.yaml
  dt-bindings: iio: dac: Add adi,ltc2672.yaml
  iio: dac: ltc2664: Add driver for LTC2664 and LTC2672

 Documentation/ABI/testing/sysfs-bus-iio       |   1 +
 Documentation/ABI/testing/sysfs-bus-iio-dac   |  61 ++
 .../ABI/testing/sysfs-bus-iio-dac-ltc2688     |  31 -
 .../bindings/iio/dac/adi,ltc2664.yaml         | 176 +++++
 .../bindings/iio/dac/adi,ltc2672.yaml         | 160 ++++
 .../devicetree/bindings/iio/dac/dac.yaml      |  50 ++
 MAINTAINERS                                   |  10 +
 drivers/iio/dac/Kconfig                       |  11 +
 drivers/iio/dac/Makefile                      |   1 +
 drivers/iio/dac/ltc2664.c                     | 736 ++++++++++++++++++
 10 files changed, 1206 insertions(+), 31 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac
 create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
 create mode 100644 Documentation/devicetree/bindings/iio/dac/adi,ltc2672.yaml
 create mode 100644 Documentation/devicetree/bindings/iio/dac/dac.yaml
 create mode 100644 drivers/iio/dac/ltc2664.c


base-commit: 3587914bf61df7924933530353d840378cdc4973