[PATCH v2 0/8] iio: ad9467 and axi-adc cleanups

[Nuno Sa via B4 Relay <devnull+nuno.sa.analog.com@kernel.org>]

As requested in [1], this is a preparatory series with some basic cleanups for
the ad9467 and adi-axi-adc drivers.

This means that the iio backend series [2] will depend on this one but
hopefully we'll quickly get this one in.

[1]: https://lore.kernel.org/linux-iio/20231204144925.4fe9922f@jic23-huawei/T/#ma7ed8a58d747e78e1ff2273c2d6cdd11de22f177
[2]: https://lore.kernel.org/linux-iio/20231204144925.4fe9922f@jic23-huawei/T/#m222f5175273b81dbfe40b7f0daffcdc67d6cb8ff

---
Changes in v2:
- Patch 1.
  * Use IS_ERR_OR_NULL() and PTR_ERR_OR_ZERO();
  * Improved commit message (mention it's inverted polarity).
- Patch 4:
  * Properly allocate enough memory for the scale array;
  * Use devm_kmalloc_array() as we don't need to zero initialize it;
  * Don't multiple by 2 in the for() loop. We just want to go over the
    rows.
 
- Link to v1: https://lore.kernel.org/r/20231205-iio-backend-prep-v1-0-7c9bc18d612b@analog.com

---
Nuno Sa (8):
      iio: adc: ad9467: fix reset gpio handling
      iio: adc: ad9467: don't ignore error codes
      iio: adc: ad9467: add mutex to struct ad9467_state
      iio: adc: ad9467: fix scale setting
      iio: adc: ad9467: use spi_get_device_match_data()
      iio: adc: ad9467: use chip_info variables instead of array
      iio: adc: ad9467: use the more common !val NULL check
      iio: adc: adi-axi-adc: convert to regmap

 drivers/iio/adc/ad9467.c            | 207 +++++++++++++++++++++++-------------
 drivers/iio/adc/adi-axi-adc.c       | 159 ++++++++++++---------------
 include/linux/iio/adc/adi-axi-adc.h |   4 +
 3 files changed, 204 insertions(+), 166 deletions(-)
---
base-commit: 5c8f90655a7bdb6232b2cea6503df16367b11a53
change-id: 20231205-iio-backend-prep-4d96ef364080
--

Thanks!
- Nuno Sá