RTQ6056: Add compatible for the same chip family

From: ChiYuan Huang <[email protected]>

RTQ6053 and RTQ6059 are the same RTQ6056 family.
The differences are listed below
- RTQ6053
Only change chip package type
- RTQ6059
1. Enlarge the shunt voltage sensing range
2. Shrink the pinout for VBUS sense pin
3. Due to 1, the scale value is also changed

Since v5:
- Correct field names for rtq6059 bitfield declaration

Since v4:
- Remove the unused chip type enum
- Directly return in switch case of read_channel function
- Refine in write_raw switch case for IIO_CHAN_INFO_SAMP_FREQ
If sample frequency is fixed, return invalid and break switch case
- Use devdata->num_channels to replace the predefined constant
- Change the rtq6059 difference part for the control bitfield name from the general 'F_xxx' to 'F_RTQ6059_xxx'
- Fix rtq6059 average sample variable store problem in 'set_average' function

Since v3:
- Add Reviewed-by tag in binding document patch
- Resotre the enum for control field.
- Put all the predefined datas/callbacks in dev_data.
- Remove the unused 'rtq6059_info'.
- Change 'default_conv_time' to 'default_conv_time_us'.
- Move the comment for default config above the dev_data setting line.

Since v2:
- Refine the description of 'compatible' property

ChiYuan Huang (2):
dt-bindings: iio: adc: rtq6056: add support for the whole RTQ6056
family
iio: adc: rtq6056: Add support for the whole RTQ6056 family

 .../bindings/iio/adc/richtek,rtq6056.yaml     |   9 +-
 drivers/iio/adc/rtq6056.c                     | 275 ++++++++++++++++--
 2 files changed, 263 insertions(+), 21 deletions(-)

base-commit: 610a9b8f49fbcf1100716370d3b5f6f884a2835a

2.34.1