Merge tag 'iio-for-7.4a' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio into char-misc-next

Jonathan writes:

IIO: 1st set of device support, features and cleanup for 7.4

2 merges
- v7.3-rc4 to get a x86 build fix needed by the ad9910 driver.
- devm_notifier_chain_register to pick up the IIO specific users of this
  new infrastructure.

New device support
------------------

Major refactors or new drivers needed:

adi,ad3530r
- Support for the AD5710R and AD5711R 8 channel IDAC / VDAC parts.
  Needed substantial driver rework to support channel type controls.
adi,ad5529r
- New driver for this 16 channel DAC with 12 and 16 bit variants.
adi,ad7768
- New driver for the 8 (AD7768) and 4 (AD7768-4) channel variants of this
  24-bit simultaneous sampling ADC family. They are very different from
  the 1 channel variant that has as separate driver.
adi,ad9910
- New driver for this DDS (Direct Digital Synthesizer). This was a large
  undertaking is it is a complex chip requiring quite a lot of new IIO ABI.
  Delayed from last cycle by an x86 bug that was fixed in rc4.
adi,ade9000
- Add support for the ADE9078 polyphase energy metering device.
  Required significant changes to introduce multiple part support into
  this driver.
adi,adis16201
- Add support for the ADIS16203 device, replacing the driver in staging.
axiado,saradc
- New driver for the SARADC found on the AX3000 and ADX3005 SoCs.
liteon,ltr501
- Add support for the LTR-329ALS-01 ambient light sensor. Included
  various bits of driver modernization.
microchip,mcp48fev02
- Split previously I2C specific mcp47feb02 into core and I2C specific
  parts.
- Add an SPI specific part for the many parts in the MCP48FxBy1/2/4/8
  series of SPI DACS 24 different part numbers covering:
  - 8, 10 and 12 bit resolutions
  - 1, 2, 4, and 8 channels
  - EEPROM and no non volatile storage variants.
- Substantial driver modification and cleanup was needed prior to the new
  support.
maxim,max40080
- New driver for this current-sense amplifier with integrated ADC.
renesas,rzg2l_adc
- Support the RZ/G3L ADC 1 that is dedicate to the on-chip thermal
  sensor unit. The thermal parts of this support will be going through
  that tree.
sensortek,stk3310
- Add support for the STK36C61 Ambient Light, proximity and RGB color
  sensor. Handling had to be added for RGB elements and the driver in
  general had to be made ready for support multiple parts.
ti,ads1100
- Add support for the ADS1110 with faster data rate and 2.048V reference.
ti,ads112c04
- New driver to support this 16bit sigma-delta ADC.
vishay,veml6031x00
- New driver for this ambient light sensor that was built in in stages.
- Add triggered buffer data capture.
- Add support for events and triggers.
- Enable mysterious 'internal calibration' setting.

Minor additions such as IDs, compatibles or device specific data.

adi,ad3530r
- Support the AD3536R which is low resolution equivalent of the already
  supported AD3532R.
adi,ad4080
- Support the AD4885 - only needed chip specific data.
aosong,am2315
- Add support for the AM2320, fully compatible wth the AM2315.
invensense,icm42600
- Minor tweaks + addition of compatible for the ICM42630 IMU.
mediatek,mt2701-adc
- Compatible for the MT6572
rockchip,saradc
- Support the RV1106.

Features
--------

IIO Core
- Add a helper to discover if timestamps are enabled.  In a few cases
  (typically when there is batching involved) we may have to refuse
  to start the buffer if timestamps are enabled.  Provided a helper
  to allow that to be queried.
IIO backend
- CRC support.
infineon,dps310
- Add triggered buffer support.
linear,ltc2497
- Add 2x conversion speed mode.
- Add the internal temperature channel.
renesas,r9a09g077
- Add missing DMA properties to DT and enable use of DMA
- Expose the sampling frequency as per channel attributes.
ti,ad1015
- Add per channel labels from DT support.
ti,ads112c14
- Add dataready trigger using continuous mode if only one channel is
  enabled.
- Add burnout current control including new IIO ABI.
- Add filter control.
- Add new ABI for settling time.

Cleanup and minor or late breaking fixes
----------------------------------------

Only calling out the more significant changes or ones that were carried
on out on several drivers.

multiple drivers
- Add sanity check for spi_device_get_match_data() returning NULL due
  to use of driver_override.
- Add some useful __counted_by_ptr markings.
- Add some missing MODULE_DEVICE_TABLE() calls.
- Use dmaenginge_get_dma_device() instead of chan->device->dev
- A few precursor cleanups for planed devm_ object allocators.
- Disable autosuspend on exit.  Note there is work ongoing to make
  this unnecessary.
- Header reorders and IWYU being applied to what was included.
- Use devm_blocking_notifier_chain_register() to replace open coded
  equivalent.
- Ensure some clk related structures are always fully initialized.
- Use the size checked iio_push_to_buffers_with_ts() replacement for
  iio_push_to_buffers_with_timestamp().
- Avoid shadowing various error codes from store() callbacks.
adi,axi-adc
- Fix missing mutex_init()
adi,ad4080
- Ensure autoincrement is set for multi register reads.
adi,ad5758
- Fix wrong offset calculation
- Reject out of range values rather than truncating values.
- Make sure buffer used for bulk acceses is DMA safe.
adi,ad7816
- Local lock to protect state by serializing accesses. A few extra locations
  were added much later in the cycle.
- Stop using non DMA safe buffers by using spi_write_then_read()
  to ensure the data was bounce buffered.
adi,adxl367
- Ensure interrupt mapping is resolved before device setup reducing work
  done before potential deferral.
- Support INT2 pin.
asahi-kasei,ak8975
- Use BIT() and GENMASK() to improve readability of defines.
- Add an enum for scan mask elements.
- Switch to devm_ for all resources.
avago,apds9306
- Fix the default sampling frequency.
awinc,aw96103
- Fix an early return that stopped all channels being checked.
broadcom,iproc-adc
- General modernization and conversion to devm managed cleanup.
- Use dev_err_probe(), local dev pointer and drop some duplicate error
  messages.
capella,cm32181
- Add device specific dt-binding as trivial-devices doesn't provide
  vdd-supply or interrupt properties.
freescale,mma8452
- Modernize driver via guard(), IIO specific cleanup helpers and
  bulk regulator handling.
infineon,dps310
- Add context analysis lock markings.
- Single local acquire / release per raw read.
- Replace opencoded get_unaligned_be24().
- Fix incorrect CFG_REG bit definitions.
invensense,icm42600
- Ensure ODR is updated when switching power mode to paper over a hardware
  bug.
- Fix detecting ODR change in invalid data packets.
- Optimize high frequency data readback by not bothering to read the
  FIFO count when the watermark is known to have been passed.
- Various other minor fixes.
isil,isl29028
- Fix a runtime pm reference leak.
liteon,ltr501
- Make the dt-binding property proximit-near-level only available
  on parts that support it.
kionix,kx022a
- Use as structure to make the channel layout explicit and use that for
  all cases (previously there were two similar buffers).
pulsed-light,lidar-lite-v2
- Move binding from trivial-devices to it's own file as there are power
  enable and mode control pins that needs describing.
renesas,r9a09g077
- Drop some interrupt descriptions for interrupts that aren't connected to
  the interrupt controller.
- Avoid direct reads when buffer enabled.
- Store the device PA and IRQ in state ready for the DMA support.
st,hts221
- Fix a potential division by zero if calibration data corrupted.
- Allow an unknown Who Am I value to support fallback dt-compatibles.
- Replace opencoded oversampling_ration_available handling with read_avail
  callback.
st,stm32-adc
- Fix up some wrong minimum sample times.
ti,ads1100
- Fix readings after datarate change by ensuring a long enough wait for
  a new sample.
ti,tmp117
- Fix case where cached state was updated before we know if the write
  to the device succeeds.
vishay,veml3328
- Reshape the scale array to improve readability as it is made up
  of value pairs.

* tag 'iio-for-7.4a' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jic23/iio: (270 commits)
  iio: dac: ad5758: Fix the offset calculation
  iio: dac: ad5758: Reject out-of-range raw values
  iio: dac: ad5758: Fix alignment for DMA safety
  iio: pressure: dps310: check the lock markings with context analysis
  iio: core: add an accessor for scan_timestamp
  iio: pressure: dps310: add triggered buffer support
  iio: pressure: dps310: take the lock once per raw read
  iio: pressure: dps310: use get_unaligned_be24() for the 24-bit results
  iio: pressure: dps310: use a local device pointer in probe
  iio: pressure: dps310: fix CFG_REG bit definitions
  staging: iio: adc: ad7816: Protect sysfs attributes with mutex
  dt-bindings: iio: Add dedicated CM32181 schema
  iio: adc: stm32: fix minimum sampling time values
  iio: light: veml6031x00: Enable internal calibration
  iio: dac: add support for Microchip MCP48FEB02
  dt-bindings: iio: dac: add support for MCP48FEB02 SPI
  iio: dac: mcp47feb02: refactor MCP47FEB02 I2C driver into two modules
  iio: dac: mcp47feb02: protect EEPROM store sequence with mutex
  iio: dac: mcp47feb02: Avoid unjustified probe error on missing label
  iio: adc: rzg2l_adc: Add RZ/G3L ADC support for TSU
  ...

1 files changed, 105 insertions, 0 deletions

diff --git a/kernel/notifier.c b/kernel/notifier.c
index 2f9fe7c30287..55fbd2be7407 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#include <linux/device/devres.h>
 #include <linux/kdebug.h>
 #include <linux/kprobes.h>
 #include <linux/export.h>
@@ -197,6 +198,58 @@ int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
 }
 EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister);
 
+struct atomic_notifier_chain_devres {
+	struct atomic_notifier_head *nh;
+	struct notifier_block *nb;
+};
+
+static void devm_atomic_notifier_chain_unregister(struct device *dev, void *res)
+{
+	struct atomic_notifier_chain_devres *dr = res;
+
+	atomic_notifier_chain_unregister(dr->nh, dr->nb);
+}
+
+/**
+ *	devm_atomic_notifier_chain_register - Device-managed atomic notifier registration
+ *	@dev: Device to tie the notifier lifetime to
+ *	@nh: Pointer to head of the atomic notifier chain
+ *	@nb: New entry in notifier chain
+ *
+ *	Adds a notifier to an atomic notifier chain and registers a cleanup
+ *	action to automatically unregister it when @dev is unbound.
+ *
+ *	Must be called in process context.
+ *
+ *	Return:
+ *	0 on success, negative errno on error.
+ */
+int devm_atomic_notifier_chain_register(struct device *dev,
+					struct atomic_notifier_head *nh,
+					struct notifier_block *nb)
+{
+	struct atomic_notifier_chain_devres *dr;
+	int ret;
+
+	dr = devres_alloc(devm_atomic_notifier_chain_unregister,
+			  sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	ret = atomic_notifier_chain_register(nh, nb);
+	if (ret) {
+		devres_free(dr);
+		return ret;
+	}
+
+	dr->nh = nh;
+	dr->nb = nb;
+	devres_add(dev, dr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_atomic_notifier_chain_register);
+
 /**
  *	atomic_notifier_call_chain - Call functions in an atomic notifier chain
  *	@nh: Pointer to head of the atomic notifier chain
@@ -349,6 +402,58 @@ int blocking_notifier_call_chain_robust(struct blocking_notifier_head *nh,
 }
 EXPORT_SYMBOL_GPL(blocking_notifier_call_chain_robust);
 
+struct blocking_notifier_chain_devres {
+	struct blocking_notifier_head *nh;
+	struct notifier_block *nb;
+};
+
+static void devm_blocking_notifier_chain_unregister(struct device *dev,
+						    void *res)
+{
+	struct blocking_notifier_chain_devres *dr = res;
+
+	blocking_notifier_chain_unregister(dr->nh, dr->nb);
+}
+
+/**
+ *	devm_blocking_notifier_chain_register - Device-managed blocking notifier registration
+ *	@dev: Device to tie the notifier lifetime to
+ *	@nh: Pointer to head of the blocking notifier chain
+ *	@nb: New entry in notifier chain
+ *
+ *	Adds a notifier to a blocking notifier chain and registers a cleanup
+ *	action to automatically unregister it when @dev is unbound.
+ *	Must be called in process context.
+ *
+ *	Return:
+ *	0 on success, negative errno on error.
+ */
+int devm_blocking_notifier_chain_register(struct device *dev,
+					  struct blocking_notifier_head *nh,
+					  struct notifier_block *nb)
+{
+	struct blocking_notifier_chain_devres *dr;
+	int ret;
+
+	dr = devres_alloc(devm_blocking_notifier_chain_unregister,
+			  sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	ret = blocking_notifier_chain_register(nh, nb);
+	if (ret) {
+		devres_free(dr);
+		return ret;
+	}
+
+	dr->nh = nh;
+	dr->nb = nb;
+	devres_add(dev, dr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_blocking_notifier_chain_register);
+
 /**
  *	blocking_notifier_call_chain - Call functions in a blocking notifier chain
  *	@nh: Pointer to head of the blocking notifier chain