Jonathan writes:
IIO: New device support, features and cleanup for 6.18
New device support
==================
ad,ade9000
- New driver for this complex energy and power monitoring ADC.
infineon,tlv493d
- New driver for this 3D magnetic sensor.
intel,dollar
- New driver for this TI PMIC (part number unknown)
marvel,88pm886
- Driver for this PMIC ADC.
microchip,mcp9600
- Add explicit support for the mcp9601 which has some additional features
over the mcp9600.
rohm,bd79112
- New driver for this ADC / GPIO Chip.
Features
========
Core
- New helper to multiply data expressed in IIO types.
- Add KUnit tests.
- New IIO_ALTCURRENT type, similar to existing IIO_ALTVOLTAGE
- Add some channel modifiers related to energy and power, such as
reactive.
adi,ad7124
- Support external clocks sources and output of the internal clocks.
- Filter control.
adi,ad7173
- Add filter support. Some fiddly interactions with other parameters on this
device.
adi,ad7779
- Add backend support which required control of the number of lanes used.
liteon,ltr390
- Add runtime PM support.
microchip,mcp9600
- Add support for different thermocouple types.
Cleanup and minor fixes
=======================
core
- Switch info_mask fields to be unsigned. Not clear why they were ever
signed.
- Fix handling of negative channel scale in iio_convert_raw_to_processed()
- Fix offset handling for channels without a scale attribute.
- Improve the precision of scaling slightly.
- Drop apparent handling of IIO_CHAN_INFO_PROCESSED for devices that don't
have any such channels.
various
- Drop many pm_runtime_mark_last_busy() calls now
pm_runtime_put_autosuspend() calls it internally.
- Drop dev_err_probe() calls where the error code is hard coded as -ENOMEM
as they don't do anything.
- Drop dev_err() calls where the error code is -ENOMEM. This will reduce
error prints, but memory failures generate a lot of messages anyway
so unlikely we need these prints.
current-sense-amplifier
- Add #io-channels property this channel to be used by a consumer driver.
adi,ad7124
- Fix incorrect clocks dt-binding property.
- Make the mclk clock optional in DT - this is internal to the ADC so should
never have been in he binding.
- Fix up sample rate to comply with ABI.
- Use read_avail() callback rather than opencoding similar.
- Deploy guard() to clean up some lock handling.
adi,ad7768
- Use devm_regulator_get_enable_read_voltage() to replace similar code.
adi,ad7816
- Drop an unnecessary dev_set_drvdata() call as nothing uses the data.
ad,adxl345
- Fix missing blank line before bullet list in documentation.
arm,scmi
- Use devm_kcalloc() for an array allocation rather than devm_kzalloc().
bosch,bmi270
- Match an ACPI ID seen in the wild. It is not spec compliant but we can't
do much about that.
bosch,bmp280
- Drop overly noisy dev_info()
- Allow for sleeping gpio controllers.
gogle,cros-ec
- Drop unused location attribute that has been replaced by label.
invense,icm42600
- Simplify the power management.
- Use guard() to simplify some locking.
maxim,max1238
- Add io-channel-cells property to dt-binding as there is an in tree
consumer.
microchip,mcp9600
- Specify a default value in dt-binding for the thermocouple type
- General whitespace cleanup.
samsung,exynos
- Drop support for the S3C2410 including bindings, and touchscreen support
as nothing else uses that.
- Drop platform ID based binding as not used.
st,vl53l0x
- Fix returning the wrong variable in an error path.
ti,pac1934
- Replace open coded devm_mutex_init().
xilinx,ams
- Update maintainers entry.
* tag 'iio-for-6.18a' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (178 commits)
MAINTAINERS: Support ROHM BD79112 ADC
iio: adc: Support ROHM BD79112 ADC/GPIO
dt-bindings: iio: adc: ROHM BD79112 ADC/GPIO
iio: pressure: bmp280: Use gpiod_set_value_cansleep()
iio: pressure: bmp280: Remove noisy dev_info()
iio: ABI: add filter types for ad7173
iio: adc: ad7173: support changing filter type
iio: adc: ad7173: rename odr field
iio: adc: ad7173: rename ad7173_chan_spec_ext_info
iio: adc: Add driver for Marvell 88PM886 PMIC ADC
dt-bindings: mfd: 88pm886: Add #io-channel-cells
iio: ABI: document "sinc4+rej60" filter_type
iio: adc: ad7124: add filter support
iio: adc: ad7124: support fractional sampling_frequency
iio: adc: ad7124: use guard(mutex) to simplify return paths
iio: adc: ad7124: use read_avail() for scale_available
iio: adc: ad7124: use clamp()
iio: adc: ad7124: fix sample rate for multi-channel use
Documentation: ABI: iio: add sinc4+lp
docs: iio: add documentation for ade9000 driver
...
The ROHM BD79112 is an ADC/GPIO with 32 channels. The channel inputs can
be used as ADC or GPIO. Using the GPIOs as IRQ sources isn't supported.
The ADC is 12-bit, supporting input voltages up to 5.7V, and separate I/O
voltage supply. Maximum SPI clock rate is 20 MHz (10 MHz with
daisy-chain configuration) and maximum sampling rate is 1MSPS.
The IC does also support CRC but it is not implemented in the driver.
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Replace `gpiod_set_value()` with `gpiod_set_value_cansleep()`, which is
required when the GPIO controller is connected via a slow bus such as
I2C. This is also safe to use in sleepable contexts like the driver
probe function.
Signed-off-by: Salah Triki <salah.triki@gmail.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support for changing the filter type to the ad7173 driver.
This family of chips by default uses a sinc5+sinc1 filter. There are
also optional post-filters that can be added in this configuration for
various 50/60Hz rejection purposes. The sinc3 filter doesn't have any
post-filters and handles the output data rate (ODR) a bit differently.
Here, we've opted to use SINC3_MAPx to get the maximum possible
sampling frequencies with the SINC3 filter.
Adding support consists of adding the filter_type and
filter_type_available attributes, making the sampling_frequency
attribute aware of the filter type, and programming the filter
parameters when we configure the channel of the ADC for reading
a sample.
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Rename odr to sinc5_odr_index in the channel setup structure. In a
following commit, we will be adding a separate odr field for when the
sinc3 filter is used instead so having sinc5 in the name will help
avoid confusion. And _index makes it more clear that this is an index
of the sinc5_data_rates array and not the output data rate itself.
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Rename ad7173_calibsys_ext_info[] to ad7173_chan_spec_ext_info[]. This
array is not limited to calibration attributes, so the name should be
more generic.
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Marvell's 88PM886 PMIC has a so-called General Purpose ADC used for
monitoring various system voltages and temperatures. Add the relevant
register definitions to the MFD header and a driver for the ADC.
Acked-by: Karel Balej <balejk@matfyz.cz> # for the PMIC
Signed-off-by: Duje Mihanović <duje@dujemihanovic.xyz>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support to the ad7124 driver for selecting the filter type.
The filter type has an influence on the effective sampling frequency of
each channel. For sinc3+pf{1,2,3,4}, the sampling frequency is fixed.
For sinc{3,4} (without post filter), there is a factor of 3 or 4
depending on the filter type. For the extra +sinc1, there is an extra
averaging factor that depends on the power mode.
In order to select the closest sampling frequency for each filter type,
we keep a copy of the requested sampling frequency. This way, if the
user sets the sampling frequency first and then selects the filter type,
the sampling frequency will still be as close as possible to the
requested value.
Since we always either have the SINGLE_CYCLE bit set or have more than
one channel enabled, the sampling frequency is always using the
"zero-latency" calculation from the data sheet. This is only documented
for the basic sinc{3,4} filters, so the other filter types had to be
inferred and confirmed through testing.
Since the flat filter type list consists of multiple register fields,
the struct ad7124_channel_config::filter_type field is changed to the
enum ad7124_filter_type type to avoid nested switch statements in a
lot of places.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Modify the attribute read/write functions for sampling_frequency and
filter_low_pass_3db_frequency to return fractional values.
These ADCs support output data rates in the single digits, so being
able to specify fractional values is necessary to use all possible
sampling frequencies.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Use guard(mutex) in a couple of functions to allow direct returns. This
simplifies the code a bit and will make later changes easier.
cleanup.h was already included for prior use of __free()
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Replace custom attribute with the standard IIO read_avail() callback
to provide in_voltage_scale_available attribute.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Change how the FS[10:0] field of the FILTER register is calculated to
get consistent sample rates when only one channel is enabled vs when
multiple channels are enabled in a buffered read.
By default, the AD7124 allows larger sampling frequencies when only one
channel is enabled. It assumes that you will discard the first sample or
so to allow for settling time and then no additional settling time is
needed between samples because there is no multiplexing due to only one
channel being enabled. The conversion formula to convert between the
sampling frequency and the FS[10:0] field is:
fADC = fCLK / (FS[10:0] x 32)
which is what the driver has been using.
On the other hand, when multiple channels are enabled, there is
additional settling time needed when switching between channels so the
calculation to convert between becomes:
fADC = fCLK / (FS[10:0] x 32 x N)
where N depends on if SINGLE_CYCLE is set, the selected filter type and,
in some cases, the power mode.
The FILTER register has a SINGLE_CYCLE bit that can be set to force the
single channel case to use the same timing as the multi-channel case.
Before this change, the first formula was always used, so if all of the
in_voltageY_sampling_frequency attributes were set to 10 Hz, then doing
a buffered read with 1 channel enabled would result in the requested
sampling frequency of 10 Hz. But when more than one channel was
enabled, the actual sampling frequency would be 2.5 Hz per channel,
which is 1/4 of the requested frequency.
After this change, the SINGLE_CYCLE flag is now always enabled and the
multi-channel formula is now always used. This causes the sampling
frequency to be consistent regardless of the number of channels enabled.
For now, we are hard-coding N = 4 since the driver doesn't yet support
other filter types other than the default sinc4 filter.
The AD7124_FILTER_FS define is moved while we are touching this to
keep the bit fields in descending order to be consistent with the rest
of the file.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add driver support for the ade9000. highly accurate,
fully integrated, multiphase energy and power quality
monitoring device.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add new IIO modifiers to support power and energy measurement devices:
Power modifiers:
- IIO_MOD_ACTIVE: Real power consumed by the load
- IIO_MOD_REACTIVE: Power that oscillates between source and load
- IIO_MOD_APPARENT: Magnitude of complex power
Signal quality modifiers:
- IIO_MOD_RMS: Root Mean Square value
Additionally adds:
- IIO_CHAN_INFO_POWERFACTOR: Power factor channel info type for
representing the ratio of active power to apparent power
These modifiers enable proper representation of power measurement
devices like energy meters and power analyzers.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support for IIO_ALTCURRENT channel type to distinguish AC current
measurements from DC current measurements. This follows the same pattern
as IIO_VOLTAGE and IIO_ALTVOLTAGE.
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Implement runtime power management for the LTR390 sensor. The device
autosuspends after 1s of idle time, reducing current consumption from
100 µA in active mode to 1 µA in standby mode as per the datasheet.
Ensure that interrupts continue to be delivered with runtime PM.
Since the LTR390 cannot be used as a wakeup source during runtime
suspend, therefore increment the runtime PM refcount when enabling
events and decrement it when disabling events or powering down.
This prevents event loss while still allowing power savings when IRQs
are unused.
Signed-off-by: Akshay Jindal <akshayaj.lkd@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Replace explicit mutex_lock() and mutex_unlock() with the guard() macro
for cleaner and safer mutex handling.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The tmag5273 driver does not advertise IIO_CHAN_INFO_PROCESSED in its
info_mask_* fields, so the corresponding case in read_raw()/write_raw()
is never used.
Drop the dead code to reduce unnecessary branches and improve clarity.
Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The als31300 driver does not advertise IIO_CHAN_INFO_PROCESSED in its
info_mask_* fields, so the corresponding case in read_raw() is never used.
Drop the dead code to reduce unnecessary branches and improve clarity.
Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Rework the power management in inv_icm42600_core_probe() to use
devm_pm_runtime_set_active_enabled(), which simplifies the runtime PM
setup by handling activation and enabling in one step.
Remove the separate inv_icm42600_disable_pm callback, as it's no longer
needed with the devm-managed approach.
Using devm_pm_runtime_enable() also fixes the missing disable of
autosuspend.
Update inv_icm42600_disable_vddio_reg() to only disable the regulator if
the device is not suspended i.e. powered-down, preventing unbalanced
disables.
Also remove redundant error msg on regulator_disable(), the regulator
framework already emits an error message when regulator_disable() fails.
This simplifies the PM setup and avoids manipulating the usage counter
unnecessarily.
Fixes: 31c24c1e93 ("iio: imu: inv_icm42600: add core of new inv_icm42600 driver")
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20250901-icm42pmreg-v3-1-ef1336246960@geanix.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The Infineon TLV493D is a Low-Power 3D Magnetic Sensor. The Sensor
applications includes joysticks, control elements (white goods,
multifunction knops), or electric meters (anti tampering) and any
other application that requires accurate angular measurements at
low power consumptions.
The Sensor is configured over I2C, and as part of Sensor measurement
data it provides 3-Axis magnetic fields and temperature core measurement.
The driver supports raw value read and buffered input via external trigger
to allow streaming values with the same sensing timestamp.
While the sensor has an interrupt pin multiplexed with an I2C SCL pin.
But for bus configurations interrupt(INT) is not recommended, unless timing
constraints between I2C data transfers and interrupt pulses are monitored
and aligned.
The Sensor's I2C register map and mode information is described in product
User Manual [1].
Datasheet: https://www.infineon.com/assets/row/public/documents/24/49/infineon-tlv493d-a1b6-datasheet-en.pdf
Link: https://www.mouser.com/pdfDocs/Infineon-TLV493D-A1B6_3DMagnetic-UserManual-v01_03-EN.pdf [1]
Signed-off-by: Dixit Parmar <dixitparmar19@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20250906-tlv493d-sensor-v6_16-rc5-v6-2-b1a62d968353@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Intel has 2 completely different "Dollar Cove" PMICs for its Bay Trail /
Cherry Trail SoCs. One is made by X-Powers and is called the AXP288.
The AXP288's GPADC is already supported by the X-Powers AXP288 ADC driver.
The other "Dollar Cove" PMIC is made by TI and does not have any clear TI
denomination, its MFD driver calls it the "Intel Dollar Cove TI PMIC".
Add a driver for the Intel Dollar Cove TI PMIC's general purpose ADC,
binding to the "chtdc_ti_adc" MFD cell of the MFD driver.
The "cht" in the cell name comes from Cherry Trail, but it turns out that
just like the AXP288 the Intel Dollar Cove TI PMIC is also used with both
Intel Bay Trail and Intel Cherry Trail SoCs, so this new ADC driver does
not include the cht part in its name.
This is loosely based on kernel/drivers/iio/adc/iio_dc_ti_gpadc.c
from the Acer A1-840 Android kernel source-code archive named:
"App. Guide_Acer_20151221_A_A.zip"
which is distributed by Acer from the Acer A1-840 support page:
https://www.acer.com/us-en/support/product-support/A1-840/downloads
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250831104825.15097-7-hansg@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Before this change iio_read_channel_processed_scale() always assumes that
channels which advertise IIO_CHAN_INFO_PROCESSED capability return
IIO_VAL_INT on success.
Ignoring any fractional values from drivers which return
IIO_VAL_INT_PLUS_MICRO / IIO_VAL_INT_PLUS_NANO. These fractional values
might become non fractional after scaling so these should be taken into
account for better precision.
Use the new iio_multiply_value() helper to do proper scaling taking
the fractionional values into account.
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250831104825.15097-5-hansg@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The channel-scale handling in iio_convert_raw_to_processed() in essence
does the following:
processed = raw * caller-provided-scale * channel-scale
Which can also be written as:
multiplier = raw * caller-provided-scale
iio-value = channel-scale
processed = multiplier * iio-value
Where iio-value is a set of IIO_VAL_* type + val + val2 integers, being
able to handle multiplication of iio-values like this is something
which is useful to have in general and, as previous bugfixes to
iio_convert_raw_to_processed() have shown, also tricky to implement.
Split the iio-value multiplication code from iio_convert_raw_to_processed()
out into a new iio_multiply_value() helper. This serves multiple purposes:
1. Having this split out allows writing a KUnit test for this.
2. Having this split out allows re-use to get better precision
when scaling values in iio_read_channel_processed_scale().
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250831104825.15097-4-hansg@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
There is an issue with the handling of negative channel scales
in iio_convert_raw_to_processed_unlocked() when the channel-scale
is of the IIO_VAL_INT_PLUS_[MICRO|NANO] type:
Things work for channel-scale values > -1.0 and < 0.0 because of
the use of signed values in:
*processed += div_s64(raw64 * (s64)scale_val2 * scale, 1000000LL);
Things will break however for scale values < -1.0. Lets for example say
that raw = 2, (caller-provided)scale = 10 and (channel)scale_val = -1.5.
The result should then be 2 * 10 * -1.5 = -30.
channel-scale = -1.5 means scale_val = -1 and scale_val2 = 500000,
now lets see what gets stored in processed:
1. *processed = raw64 * scale_val * scale;
2. *processed += raw64 * scale_val2 * scale / 1000000LL;
1. Sets processed to 2 * -1 * 10 = -20
2. Adds 2 * 500000 * 10 / 1000000 = 10 to processed
And the end result is processed = -20 + 10 = -10, which is not correct.
Fix this by always using the abs value of both scale_val and scale_val2
and if either is negative multiply the end-result by -1.
Note there seems to be an unwritten rule about negative
IIO_VAL_INT_PLUS_[MICRO|NANO] values that:
i. values > -1.0 and < 0.0 are written as val=0 val2=-xxx
ii. values <= -1.0 are written as val=-xxx val2=xxx
But iio_format_value() will also correctly display a third option:
iii. values <= -1.0 written as val=-xxx val2=-xxx
Since iio_format_value() uses abs(val) when val2 < 0.
This fix also makes iio_convert_raw_to_processed() properly handle
channel-scales using this third option.
Fixes: 48e44ce0f8 ("iio:inkern: Add function to read the processed value")
Cc: Matteo Martelli <matteomartelli3@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250831104825.15097-2-hansg@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
The ADF4350/1 features a programmable dual-modulus prescaler of 4/5 or 8/9.
When set to 4/5, the maximum RF frequency allowed is 3 GHz.
Therefore, when operating the ADF4351 above 3 GHz, this must be set to 8/9.
In this context not the RF output frequency is meant
- it's the VCO frequency.
Therefore move the prescaler selection after we derived the VCO frequency
from the desired RF output frequency.
This BUG may have caused PLL lock instabilities when operating the VCO at
the very high range close to 4.4 GHz.
Fixes: e31166f0fd ("iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers")
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20250829-adf4350-fix-v2-1-0bf543ba797d@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add support for an external clock source to the AD7124 ADC driver.
Previously, the driver only supported using the internal clock and had
bad devicetree bindings that used a fake clock to essentially select
the power mode. This is preserved for backwards compatibility.
If the clock is not named "mclk", then we know that the devicetree is
using the correct bindings and we can configure the chip to use an
external clock source rather than internal.
Also drop a redundant comment when configuring the register fields
instead of adding more.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250828-iio-adc-ad7124-proper-clock-support-v3-3-0b317b4605e5@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Make the "mclk" clock optional in the ad7124 driver. The MCLK is an
internal counter on the ADC, so it is not something that should be
coming from the devicetree. However, existing users may be using this
to essentially select the power mode of the ADC from the devicetree.
In order to not break those users, we have to keep the existing "mclk"
handling, but now it is optional.
Now, when the "mclk" clock is omitted from the devicetree, the driver
will default to the full power mode. Support for an external clock
and dynamic power mode switching can be added later if needed.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250828-iio-adc-ad7124-proper-clock-support-v3-2-0b317b4605e5@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
