[PATCH v4 0/3] Add the Renesas X9250 potentiometers IIO support

[Herve Codina <herve.codina@bootlin.com>]

Hi,

The Renesas X9250 integrated four digitally controlled potentiometers.
On each potentiometer, the X9250T has a 100 kOhms total resistance and
the X9250U has a 50 kOhms total resistance.

Compare to the previous iteration
  https://lore.kernel.org/linux-kernel/20230421085245.302169-1-herve.codina@bootlin.com/
This v4 series updates the binding, introduced the power-supply
regulators and the write-protect gpio, uses spi_write_then_read(),
removes spi_get_device_id(spi)->name, removes spi_set_drvdata() call.

Best regards,
Herve Codina

Changes v3 -> v4
  - Patch 1
    Remove iio.yaml.
    Add 'vcc-supply', 'avp-supply' and 'avn-supply'.
    Add 'wp-gpios'

  - Patch 2
    Get and enable the regulators.
    Manage the write-protect gpio.
    Use spi_write_then_read().
    Remove the unneeded spi_setup() call.
    Get name from field added in struct x9250_cfg instead of
    spi_get_device_id(spi)->name.

  - Patch 3
    No changes

Changes v2 -> v3
  - Patch 1
    Remove the reg property description
    Use 'potentiometer' for the node name in the example.

  - Patch 2 and 3
    No changes

Changes v1 -> v2
  - Patch 1
    No changes

  - Patch 2
    Use a define for the 0x50 value used multiple times.

  - Patch 3
    No changes

Herve Codina (3):
  dt-bindings: iio: potentiometer: Add the Renesas X9250 potentiometers
  iio: potentiometer: Add support for the Renesas X9250 potentiometers
  MAINTAINERS: add the Renesas X9250 driver entry

 .../iio/potentiometer/renesas,x9250.yaml      |  78 ++++++
 MAINTAINERS                                   |   7 +
 drivers/iio/potentiometer/Kconfig             |  10 +
 drivers/iio/potentiometer/Makefile            |   1 +
 drivers/iio/potentiometer/x9250.c             | 223 ++++++++++++++++++
 5 files changed, 319 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/potentiometer/renesas,x9250.yaml
 create mode 100644 drivers/iio/potentiometer/x9250.c

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2.40.1