[v7,0/3] Add support for Allwinner GPADC on D1/T113s/R329/T507 SoCs

Message

Maksim Kiselev June 15, 2023, 8:55 p.m. UTC

This series adds support for general purpose ADC (GPADC) on new
Allwinner's SoCs, such as D1, T113s, T507 and R329. The implemented driver
provides basic functionality for getting ADC channels data.

Change History:
v7:
- Fixed typo in DT bindings property

v6:
- Fixed DT bindings regexp for channel properties
- Dropped checking the max number of channels from the drivers code
  (This is redundant as we raly on DT bindings check)

v5:
- Fixed DT bindings properties for child nodes

v4:
- Fixed DT bindings warnings
- Used GENMASK to clear the irq register
- Minor formatting fixes

v3:
- Added DT bindings dual license, fixed property order and example formatting
- Added explanations comments for timeout and mutex
- Dropped unnecessary regmap and used readl/writel instead
- Added error message about getting channel number
- Renamed labels and variables to make them self-explanatory

v2:
- Added lastch flag to avoid addition work for already selected channel
- Added reset assertion on module remove
- Added dynamic channel allocation and dropped iio_chan_spec arrays
- Changed IIO_CHAN_INFO_SCALE type to FRACTIONAL_LOG2
- Dropped separate compatible strings and configs for T113s and R329
- Fixed includes
- Fixed Kconfig description
- Removed duplicate probe error messages
- Used FIELD_PREP for bit setup

v1:
- Initial version

Maksim Kiselev (3):
  iio: adc: Add Allwinner D1/T113s/R329/T507 SoCs GPADC
  dt-bindings: iio: adc: Add Allwinner D1/T113s/R329/T507 SoCs GPADC
  riscv: dts: allwinner: d1: Add GPADC node

 .../iio/adc/allwinner,sun20i-d1-gpadc.yaml    |  91 ++++++
 .../boot/dts/allwinner/sunxi-d1s-t113.dtsi    |  10 +
 drivers/iio/adc/Kconfig                       |  10 +
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/sun20i-gpadc-iio.c            | 276 ++++++++++++++++++
 5 files changed, 388 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/allwinner,sun20i-d1-gpadc.yaml
 create mode 100644 drivers/iio/adc/sun20i-gpadc-iio.c