add support for Aosong AM2320

The AM2320 is fully compatible with the AM2315 sensor in terms of I2C communication protocol and measurement conversions.

This patch series adds am2320 to the i2c_device_id table, creates of_device_id table and adds both am2315 and am2320 to trivial-devices.yml dt bindings.

v4:
- Addressed minor styling issues in driver's C code pointed by Andy Shevchenko (carried "Reviewed-by: Andy Shevchenko <...> from v3)
- Adapted commit message pointed by Marcelo Schmitt (carried "Reviewed-by: Marcelo Schmitt <...>" from v3)
- Carried Acked-by: "Krzysztof Kozlowski <...>: from v3 dt-bindings patch since bindings patch did not change.

Note: I carried tags from v3 because reviewers declared the tag after pointing things that were resolved in v4 (and the dt-bindings one because the patch did not change from v3 to v4). If this is a mistake please let me know.

v3: [3]
- Added "aosong,am2315" and "aosong,am2320" to trivial-devices.yml.
- Added of_device_id table.
- Replaced using a constant for driver's name with chip_info struct.
- Separated code changes and dt-bindings changes in two commits.

v2: [2]
- Generalized KConfig description text.

v1: [1]

[1] https://lore.kernel.org/all/[email protected]/T/#u
[2] https://lore.kernel.org/all/[email protected]/T/#u
[3] https://lore.kernel.org/all/[email protected]/

Nicolás Antinori (2):
dt-bindings: trivial-devices: add Aosong AM2315 and AM2320 chips
iio: humidity: am2315: add support for am2320

 .../devicetree/bindings/trivial-devices.yaml  |  2 ++
 drivers/iio/humidity/Kconfig                  |  8 +++--
 drivers/iio/humidity/am2315.c                 | 34 ++++++++++++++++---
 3 files changed, 36 insertions(+), 8 deletions(-)

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2.47.3