[PATCH v4 0/6] Add support for AD3532R/AD3532

[Kim Seer Paller]

This series adds support for the AD3532R/AD3532, a 16-channel, 16-bit
voltage output DAC, to the existing ad3530r driver.

The AD3532R is part of the AD3530R family and shares similar
functionality (channel configuration, LDAC triggering, powerdown
control). It extends the existing ad3530r driver as the underlying
workflow remains the same. The main difference being the register
address map due to the dual-bank architecture, which is handled
by table-driven helpers introduced in this series.

The AD3532R uses a dual-bank register architecture (bank 0 at 0x1000
for channels 0-7, bank 1 at 0x3000 for channels 8-15). Per-chip
register address arrays in chip_info are iterated by bank helpers,
replacing single-register setup calls for existing variants and scaling
naturally to the AD3532R's dual-bank layout.

The series also adds AD3532R-specific powerdown modes (1kohm_to_gnd,
10kohm_to_gnd, three_state) and a new ABI entry for the 10kohm_to_gnd
powerdown mode.

Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad3532r.pdf

Signed-off-by: Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
---
Changes in v4:
- Split the table-driven refactor into three patches: sw_ldac_trig_reg
  function pointer, table-driven register banks, and a no-op per-chip
  regmap_config precursor.
- Use regmap_set_bits() in the bank helper instead of regmap_update_bits().
- Split the AD3532R register defines into separate bank 0 / bank 1
  comment blocks.
- Derive the bank in ad3532r_input_ch_reg(), ad3532r_trigger_sw_ldac_reg()
  via AD3530R_CH_PER_BANK instead of magic 8.
- ad3532r_set_dac_powerdown(): narrow the mutex to the shared state and IO,
  use regmap_clear_bits() on power-up, and drop the pdmode.
- Link to v3: https://patch.msgid.link/20260629-iio-ad3532r-support-v3-0-f6e4f4abebbe@xxxxxxxxxx

Changes in v3:
- Reverted the spi_device_id named initializer change from v2, to avoid
  crossing with Uwe's tree-wide SPI series.
- Reworked the Kconfig help text into an explicit per-part list.
- Removed a duplicate .input_ch_reg initialization in ad3530r_chip
  caught by Sashiko.
- Sorted AD3532R register defines by address (bank 0, then bank 1) with
  a comment about the two banks.
- Split the register/mask calculation in ad3532r_set_dac_powerdown()
  into named variables for readability.
- Link to v2: https://patch.msgid.link/20260615-iio-ad3532r-support-v2-0-84a0af8b83fa@xxxxxxxxxx

Changes in v2:
- Split AD3532R patch into refactor only and new device support patches.
- Add ad3530r_set_reg_bank_bits() helper for set-bits call sites.
- Use for (unsigned int i = 0; ...) in bank helpers.
- Add per-chip regmap_config to limit debugfs register space per variant.
- Switch spi_device_id to named initializers.
- Fix line wrapping in ad3532r_set_dac_powerdown().
- Link to v1: https://patch.msgid.link/20260604-iio-ad3532r-support-v1-0-c3552f9031de@xxxxxxxxxx

To: Nuno Sá <nuno.sa@xxxxxxxxxx>
To: Michael Hennerich <Michael.Hennerich@xxxxxxxxxx>
To: Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
To: Jonathan Cameron <jic23@xxxxxxxxxx>
To: David Lechner <dlechner@xxxxxxxxxxxx>
To: Andy Shevchenko <andy@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: linux-iio@xxxxxxxxxxxxxxx
Cc: linux@xxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx

---
Kim Seer Paller (6):
      iio: ABI: add DAC 10kohm_to_gnd powerdown mode
      dt-bindings: iio: dac: add support for AD3532R/AD3532
      iio: dac: ad3530r: Convert sw_ldac_trig_reg to a function pointer
      iio: dac: ad3530r: Refactor setup to table-driven register banks
      iio: dac: ad3530r: Make regmap_config selectable per chip
      iio: dac: ad3530r: Add support for AD3532R/AD3532

 Documentation/ABI/testing/sysfs-bus-iio            |   1 +
 .../devicetree/bindings/iio/dac/adi,ad3530r.yaml   |  16 +-
 drivers/iio/dac/Kconfig                            |   7 +-
 drivers/iio/dac/ad3530r.c                          | 351 +++++++++++++++++++--
 4 files changed, 332 insertions(+), 43 deletions(-)
---
base-commit: eb787019c42072cf13470afca673dab0b49cabb6
change-id: 20260604-iio-ad3532r-support-759067e904e1

Best regards,
--  
Kim Seer Paller <kimseer.paller@xxxxxxxxxx>