linux.git/drivers/iio/dac, branch master

Merge tag 'v7.0-rc7' into char-misc-next

2026-04-06T07:04:53+00:00

We need the char/misc/iio/comedi fixes in here as well for testing

Signed-off-by: Greg Kroah-Hartman

iio: dac: ds4424: add Rfs-based scale and per-variant limits

2026-03-22T12:44:23+00:00

Parse optional maxim,rfs-ohms values to derive the per-channel output
current scale (mA per step) for the IIO current ABI.

Behavior changes:
- If maxim,rfs-ohms is present, IIO_CHAN_INFO_SCALE becomes available
  and reports mA/step derived from Rfs.
- If maxim,rfs-ohms is missing, SCALE is not exposed to keep older DTs
  working without requiring updates.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: convert to regmap

2026-03-22T12:44:23+00:00

Refactor the driver to use the regmap API.

Replace the driver-specific mutex and manual shadow buffers with the
standard regmap infrastructure for locking and caching.

This ensures the cache is populated from hardware at probe, preventing
state desynchronization (e.g. across suspend/resume).

Define access tables to validate the different register maps of DS44x2
and DS44x4.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Sander Vanheule 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: support per-variant output range limits

2026-03-22T12:43:48+00:00

The DS4402/DS4404 variants operate with a 5-bit resolution (31 steps),
whereas the DS4422/DS4424 support 7-bit (127 steps).

Previously, the driver enforced a hardcoded 7-bit mask (DS4424_DAC_MASK)
for all variants. This allowed users to write values exceeding the 5-bit
range to DS4402/DS4404 devices, resulting in silent truncation or
undefined behavior.

Add a `result_mask` field to the chip_info structure to define the valid
data range for each variant. Use this mask to:
1. Correctly mask register values in read_raw().
2. Return -EINVAL in write_raw() if the input value exceeds the
   variant's capabilities.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: add DS4402/DS4404 device IDs

2026-03-22T12:43:47+00:00

Add I2C/OF IDs for DS4402 and DS4404 and set the correct channel count.
Follow-up changes add per-variant scaling based on external Rfs.

Co-developed-by: Oleksij Rempel 
Signed-off-by: Oleksij Rempel 
Signed-off-by: David Jander 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: use fsleep() instead of usleep_range()

2026-03-22T12:43:47+00:00

The DS4422/DS4424 and DS4402/DS4404 datasheets do not specify a minimum
delay between power-up (POR) and the availability of the I2C interface.

The driver previously used `usleep_range(1000, 1200)` to enforce a ~1ms
delay. Replace this with `fsleep(1000)` to allow the kernel to select
the most efficient sleep mechanism while retaining the existing
conservative delay to ensure device readiness.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: use device match data for chip info

2026-03-22T12:43:22+00:00

Refactor the driver to use device match data instead of checking ID enums
in a switch statement.

Define a `ds4424_chip_info` structure to hold variant-specific attributes
(currently just the channel count) and attach it directly to the I2C and
OF device ID tables.

This simplifies the probe function and makes it easier to add support for
new variants like DS4402/DS4404.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: rename iio_info struct to avoid ambiguity

2026-03-22T12:43:22+00:00

Rename the static `ds4424_info` structure to `ds4424_iio_info`.

The previous name was generic and could be confused with chip-specific
data structures (like the upcoming `ds4424_chip_info`). The new name
explicitly indicates that this structure holds the IIO framework
callbacks.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: sort headers alphabetically

2026-03-22T12:43:22+00:00

Sort the header inclusions alphabetically. This improves readability and
simplifies adding new includes in the future.

Group subsystem-specific headers (linux/iio/*) separately at the end
to clarify subsystem context.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron

iio: dac: ds4424: ratelimit read errors and use device context

2026-03-22T12:38:30+00:00

Replace pr_err() with dev_err_ratelimited() in the RAW read path to avoid
log spam on repeated I2C failures and to include the device context.

Use %pe to print errno names for faster debugging. Use the parent
device context to identify the physical hardware causing the error.

Signed-off-by: Oleksij Rempel 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Jonathan Cameron