[PATCH v5 0/3] Add SARADC support on Sophgo CV18XX series

[Thomas Bonnefille <thomas.bonnefille@bootlin.com>]

This patchset adds initial ADC support for Sophgo CV18XX series SoC. This driver can
work with or without interrupt.

Link: https://github.com/sophgo/sophgo-doc/releases/download/sg2002-trm-v1.0/sg2002_trm_en.pdf

Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
---
Changes in v5:
- Add the ability to read the sample frequency
- Edit commit message to remove No-Die reference and add precision on
  the ADC series
- Rename binding and driver file to match compatible
- Reformat the channel property in the binding
- Clean driver code
- Link to v4: https://lore.kernel.org/r/20240812-sg2002-adc-v4-0-599bdb67592f@bootlin.com

Changes in v4:
- Lowercase register hexadecimal value in dts
- Reorder properties in dts
- Use only a const in the compatible property of the device tree bindings
- Specify the series of SoC in the driver to avoid confusing with other
  Sophgo SoCs
- Add channel description in the bindings
- Use FIELD_PREP in the default configuration
- Index channels from 0
- Return PTR_ERR instead of IS_ERR
- Link to v3: https://lore.kernel.org/r/20240731-sg2002-adc-v3-0-5ac40a518c0a@bootlin.com

Changes in v3:
- Subdivide default cycle configuration into multiple elementary
  configurations
- Fix formatting in the driver
- Use devm_mutex_init
- Use devm_clk_get_enabled now because the clock is no more optional
- Remove handling of Saradc in No-Die Domain as RTC isn't implemented yet
- Use cv1800-saradc as default compatible instead of a wildcard
- Remove platform_set_drvdata as it wasn't used
- Link to v2: https://lore.kernel.org/r/20240705-sg2002-adc-v2-0-83428c20a9b2@bootlin.com

Changes in v2:
- Drop modifications in MAINTAINERS file
- Rename the ADC from "sophgo-adc" to "sophgo-cv18xx-adc" to avoid
  conflict with ADCs available in future Sophgo SoCs.
- Reorder nodes in DT to match DTS coding style
- Switch from including <linux/of.h> to <linux/mod_devicetable.h>
- Use scoped_guard instead of mutex_lock/unlock
- Check IRQ Status in the handler
- Change IIO device name
- Use devm_clk_get_optional_enabled instead of a clock variable
- Init completion before the IRQ request
- Removed unnecessary iio_info structure in the private data of the
  driver
- Use SoC specific compatible in the bindings and device trees
- Link to v1: https://lore.kernel.org/r/20240702-sg2002-adc-v1-0-ac66e076a756@bootlin.com

---
Thomas Bonnefille (3):
      dt-bindings: iio: adc: sophgo,cv1800b-saradc: Add Sophgo CV1800B SARADC
      iio: adc: sophgo-saradc: Add driver for Sophgo CV1800B SARADC
      riscv: dts: sophgo: Add SARADC description for Sophgo CV1800B

 .../bindings/iio/adc/sophgo,cv1800b-saradc.yaml    |  83 ++++++++
 arch/riscv/boot/dts/sophgo/cv18xx.dtsi             |  22 +++
 drivers/iio/adc/Kconfig                            |  10 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/sophgo-cv1800b-adc.c               | 218 +++++++++++++++++++++
 5 files changed, 334 insertions(+)
---
base-commit: 5be63fc19fcaa4c236b307420483578a56986a37
change-id: 20240527-sg2002-adc-924b862cd3f2

Best regards,
-- 
Thomas Bonnefille <thomas.bonnefille@bootlin.com>