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

From: Herve Codina
Date: Tue May 09 2023 - 12:09:18 EST


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
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

- 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 ++++++
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