[PATCH v5 0/6] iio: dac: ad5504: bindings, cleanups, locking, and scale fixes

[Taha Ed-Dafili]

Jonathan Cameron applied patches 2 (sort headers alphabetically) and 4
(introduce local dev pointer) from v3 directly to iio/testing. This
series rebases on top of that state and does not re-send those
patches.

This v5 series addresses feedback from the v4 review by Jonathan
Cameron, Andy Shevchenko and Uwe Kleine-König:

* Drop <linux/mod_devicetable.h> — now covered by spi.h (Andy, Uwe)
* Add blank lines after all guard() call sites (Andy)
* Rename macro to AD5504_VREF_ACPI_DEFAULT_mV (Andy)
* Switch to is_acpi_device_node(dev_fwnode(dev)) (Andy)
* Use (MICRO / MILLI) for microvolt-to-millivolt conversions (Andy)
* Trim all commit messages (Andy, Jonathan)
* Reorder ACPI/DT separation before pdata removal to avoid an
  intermediate commit that hard-fails probe on regulator-less
  systems (issue raised by Andy)

Testing:
Re-verified on ARM64 Raspberry Pi 5 (BCM2712) using a custom Device
Tree overlay on spi10, without physical AD5504 hardware. All test
cases from v4 pass unchanged with the v5 code:

60V path (output-range-microvolt = <0 60000000>):
$ cat /sys/bus/iio/devices/iio:device0/out_voltage_scale
14.648437500  (60000 mV / 4096)

30V path (output-range-microvolt = <0 30000000>):
$ cat /sys/bus/iio/devices/iio:device0/out_voltage_scale
7.324218750   (30000 mV / 4096)

Invalid range (output-range-microvolt = <0 70000000>):
[   94.762850] ad5504 spi10.0: error -EINVAL: Invalid output-range-microvolt
[   94.762857] ad5504 spi10.0: probe with driver ad5504 failed with error -22

Backward compatibility (no output-range-microvolt, vcc-supply = 60V):
$ cat /sys/bus/iio/devices/iio:device0/out_voltage_scale
14.648437500  (60000 mV / 4096 via regulator fallback)

Powerdown sysfs read/write and powerdown mode switching (20kohm_to_gnd,
three_state) verified on all four channels without errors.

Previous versions:
v4: https://lore.kernel.org/linux-iio/20260817211118.21833-1-0rayn.dev@xxxxxxxxx/
v3: https://lore.kernel.org/linux-iio/20260509142047.30302-1-0rayn.dev@xxxxxxxxx/
v2: https://lore.kernel.org/linux-iio/20260310174835.24209-1-0rayn.dev@xxxxxxxxx/
v1: https://lore.kernel.org/linux-iio/20260212181955.42724-1-0rayn.dev@xxxxxxxxx/

Thank you to Jonathan Cameron, David Lechner, Andy Shevchenko, Nuno Sá,
Krzysztof Kozlowski, Conor Dooley and Uwe Kleine-König for the
continued reviews.

Taha Ed-Dafili (6):
  dt-bindings: iio: dac: ad5504: add output-range and missing gpios
  iio: dac: ad5504: Align headers with IWYU principle
  iio: dac: ad5504: separate ACPI and DT paths
  iio: dac: ad5504: remove legacy platform data support
  iio: dac: ad5504: introduce local lock to protect state and spi
    transfers
  iio: dac: ad5504: support scale via output-range-microvolt property

 .../bindings/iio/dac/adi,ad5504.yaml          | 39 ++++++++-
 drivers/iio/dac/ad5504.c                      | 82 +++++++++++++++----
 include/linux/iio/dac/ad5504.h                | 15 ----
 3 files changed, 103 insertions(+), 33 deletions(-)
 delete mode 100644 include/linux/iio/dac/ad5504.h

-- 
2.55.0