[PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[Sean Nyekjaer]

Add basic support for NXP FXLS8962AF/FXLS8964AF Automotive
accelerometers.
It will allow setting up scale/gain and reading x,y,z
axis.

Datasheet: https://www.nxp.com/docs/en/data-sheet/FXLS8962AF.pdf
Datasheet: https://www.nxp.com/docs/en/data-sheet/FXLS8964AF.pdf
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
Changes for v2: 
 - Addressed Kconfig comments
 - Using regmap_read_poll_timeout()
 - Addresed comments from Andy and Jonathan

Changes for v3:
 - fixed Kconfig ordering
 - read INT_STATUS after reset, to ensure the device is ready
 - fixed a few xmas trees
 - added datasheet tags 

I'm adding interrupt support RFC will be posted soonish :)

 drivers/iio/accel/Kconfig           |  27 ++
 drivers/iio/accel/Makefile          |   3 +
 drivers/iio/accel/fxls8962af-core.c | 616 ++++++++++++++++++++++++++++
 drivers/iio/accel/fxls8962af-i2c.c  |  57 +++
 drivers/iio/accel/fxls8962af-spi.c  |  57 +++
 drivers/iio/accel/fxls8962af.h      |  22 +
 6 files changed, 782 insertions(+)
 create mode 100644 drivers/iio/accel/fxls8962af-core.c
 create mode 100644 drivers/iio/accel/fxls8962af-i2c.c
 create mode 100644 drivers/iio/accel/fxls8962af-spi.c
 create mode 100644 drivers/iio/accel/fxls8962af.h

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 2e0c62c39155..7317d839ca1a 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -208,6 +208,33 @@ config DMARD10
 	  Choosing M will build the driver as a module. If so, the module
 	  will be called dmard10.
 
+config FXLS8962AF
+	tristate
+
+config FXLS8962AF_I2C
+	tristate "NXP FXLS8962AF/FXLS8964AF Accelerometer I2C Driver"
+	depends on I2C
+	select FXLS8962AF
+	select REGMAP_I2C
+	help
+	  Say yes here to build support for the NXP 3-axis automotive
+	  accelerometer FXLS8962AF/FXLS8964AF with I2C support.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called fxls8962af_i2c.
+
+config FXLS8962AF_SPI
+	tristate "NXP FXLS8962AF/FXLS8964AF Accelerometer SPI Driver"
+	depends on SPI
+	select FXLS8962AF
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for the NXP 3-axis automotive
+	  accelerometer FXLS8962AF/FXLS8964AF with SPI support.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called fxls8962af_spi.
+
 config HID_SENSOR_ACCEL_3D
 	depends on HID_SENSOR_HUB
 	select IIO_BUFFER
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 4f6c1ebe13b0..1b8c479c6f7c 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -25,6 +25,9 @@ obj-$(CONFIG_DA311)	+= da311.o
 obj-$(CONFIG_DMARD06)	+= dmard06.o
 obj-$(CONFIG_DMARD09)	+= dmard09.o
 obj-$(CONFIG_DMARD10)	+= dmard10.o
+obj-$(CONFIG_FXLS8962AF)	+= fxls8962af-core.o
+obj-$(CONFIG_FXLS8962AF_I2C)	+= fxls8962af-i2c.o
+obj-$(CONFIG_FXLS8962AF_SPI)	+= fxls8962af-spi.o
 obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
 obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
 obj-$(CONFIG_KXSD9)	+= kxsd9.o
diff --git a/drivers/iio/accel/fxls8962af-core.c b/drivers/iio/accel/fxls8962af-core.c
new file mode 100644
index 000000000000..b3b0169e6a17
--- /dev/null
+++ b/drivers/iio/accel/fxls8962af-core.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NXP FXLS8962AF/FXLS8964AF Accelerometer Core Driver
+ *
+ * Copyright 2021 Connected Cars A/S
+ *
+ * Datasheet:
+ * https://www.nxp.com/docs/en/data-sheet/FXLS8962AF.pdf
+ * https://www.nxp.com/docs/en/data-sheet/FXLS8964AF.pdf
+ *
+ * Errata:
+ * https://www.nxp.com/docs/en/errata/ES_FXLS8962AF.pdf
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "fxls8962af.h"
+
+#define FXLS8962AF_INT_STATUS			0x00
+#define FXLS8962AF_INT_STATUS_SRC_BOOT		BIT(0)
+#define FXLS8962AF_INT_STATUS_SRC_DRDY		BIT(7)
+#define FXLS8962AF_TEMP_OUT			0x01
+#define FXLS8962AF_VECM_LSB			0x02
+#define FXLS8962AF_OUT_X_LSB			0x04
+#define FXLS8962AF_OUT_Y_LSB			0x06
+#define FXLS8962AF_OUT_Z_LSB			0x08
+#define FXLS8962AF_BUF_STATUS			0x0b
+#define FXLS8962AF_BUF_X_LSB			0x0c
+#define FXLS8962AF_BUF_Y_LSB			0x0e
+#define FXLS8962AF_BUF_Z_LSB			0x10
+
+#define FXLS8962AF_PROD_REV			0x12
+#define FXLS8962AF_WHO_AM_I			0x13
+
+#define FXLS8962AF_SYS_MODE			0x14
+#define FXLS8962AF_SENS_CONFIG1			0x15
+#define FXLS8962AF_SENS_CONFIG1_ACTIVE		BIT(0)
+#define FXLS8962AF_SENS_CONFIG1_RST		BIT(7)
+#define FXLS8962AF_SC1_FSR_MASK			GENMASK(2, 1)
+#define FXLS8962AF_SC1_FSR_PREP(x)		FIELD_PREP(FXLS8962AF_SC1_FSR_MASK, x)
+#define FXLS8962AF_SC1_FSR_GET(x)		FIELD_GET(FXLS8962AF_SC1_FSR_MASK, x)
+
+#define FXLS8962AF_SENS_CONFIG2			0x16
+#define FXLS8962AF_SENS_CONFIG3			0x17
+#define FXLS8962AF_SENS_CONFIG4			0x18
+#define FXLS8962AF_SENS_CONFIG5			0x19
+
+#define FXLS8962AF_WAKE_IDLE_LSB		0x1b
+#define FXLS8962AF_SLEEP_IDLE_LSB		0x1c
+#define FXLS8962AF_ASLP_COUNT_LSB		0x1e
+
+#define FXLS8962AF_INT_EN			0x20
+#define FXLS8962AF_INT_PIN_SEL			0x21
+
+#define FXLS8962AF_OFF_X			0x22
+#define FXLS8962AF_OFF_Y			0x23
+#define FXLS8962AF_OFF_Z			0x24
+
+#define FXLS8962AF_BUF_CONFIG1			0x26
+#define FXLS8962AF_BUF_CONFIG2			0x27
+
+#define FXLS8962AF_ORIENT_STATUS		0x28
+#define FXLS8962AF_ORIENT_CONFIG		0x29
+#define FXLS8962AF_ORIENT_DBCOUNT		0x2a
+#define FXLS8962AF_ORIENT_BF_ZCOMP		0x2b
+#define FXLS8962AF_ORIENT_THS_REG		0x2c
+
+#define FXLS8962AF_SDCD_INT_SRC1		0x2d
+#define FXLS8962AF_SDCD_INT_SRC2		0x2e
+#define FXLS8962AF_SDCD_CONFIG1			0x2f
+#define FXLS8962AF_SDCD_CONFIG2			0x30
+#define FXLS8962AF_SDCD_OT_DBCNT		0x31
+#define FXLS8962AF_SDCD_WT_DBCNT		0x32
+#define FXLS8962AF_SDCD_LTHS_LSB		0x33
+#define FXLS8962AF_SDCD_UTHS_LSB		0x35
+
+#define FXLS8962AF_SELF_TEST_CONFIG1		0x37
+#define FXLS8962AF_SELF_TEST_CONFIG2		0x38
+
+#define FXLS8962AF_MAX_REG			0x38
+
+#define FXLS8962AF_DEVICE_ID			0x62
+#define FXLS8964AF_DEVICE_ID			0x84
+
+/* Raw temp channel offset */
+#define FXLS8962AF_TEMP_CENTER_VAL		25
+
+#define FXLS8962AF_AUTO_SUSPEND_DELAY_MS	2000
+
+#define FXLS8962AF_SCALE_TABLE_LEN		4
+
+static const int fxls8962af_scale_table[FXLS8962AF_SCALE_TABLE_LEN][2] = {
+	{0, IIO_G_TO_M_S_2(980000)},
+	{0, IIO_G_TO_M_S_2(1950000)},
+	{0, IIO_G_TO_M_S_2(3910000)},
+	{0, IIO_G_TO_M_S_2(7810000)},
+};
+
+struct fxls8962af_chip_info {
+	const char *name;
+	const struct iio_chan_spec *channels;
+	int num_channels;
+	u8 chip_id;
+};
+
+struct fxls8962af_data {
+	struct regmap *regmap;
+	const struct fxls8962af_chip_info *chip_info;
+	struct regulator *vdd_reg;
+	struct iio_mount_matrix orientation;
+};
+
+const struct regmap_config fxls8962af_regmap_conf = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = FXLS8962AF_MAX_REG,
+};
+EXPORT_SYMBOL_GPL(fxls8962af_regmap_conf);
+
+enum {
+	fxls8962af_idx_x,
+	fxls8962af_idx_y,
+	fxls8962af_idx_z,
+	fxls8962af_idx_ts,
+};
+
+static int fxls8962af_drdy(struct fxls8962af_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read_poll_timeout(data->regmap, FXLS8962AF_INT_STATUS, reg,
+			(reg & FXLS8962AF_INT_STATUS_SRC_DRDY), 20000, 2000000);
+	if (ret) {
+		dev_err(dev, "drdy timeout, int_status = 0x%x\n", reg);
+	}
+
+	return ret;
+}
+
+static int fxls8962af_power_on(struct fxls8962af_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+
+	ret = pm_runtime_get_sync(dev);
+
+	if (ret < 0) {
+		dev_err(dev, "failed to power on\n");
+		pm_runtime_put_noidle(dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fxls8962af_power_off(struct fxls8962af_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	int ret;
+
+	pm_runtime_mark_last_busy(dev);
+	ret = pm_runtime_put_autosuspend(dev);
+
+	if (ret < 0) {
+		dev_err(dev, "failed to power off\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int fxls8962af_get_temp(struct fxls8962af_data *data, int *val)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	unsigned int value;
+	int ret;
+
+	ret = fxls8962af_drdy(data);
+	if (ret < 0)
+		return ret;
+
+	ret = fxls8962af_power_on(data);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(data->regmap, FXLS8962AF_TEMP_OUT, &value);
+	if (ret < 0) {
+		dev_err(dev, "Error reading reg_temp\n");
+		fxls8962af_power_off(data);
+		return ret;
+	}
+
+	fxls8962af_power_off(data);
+
+	*val = sign_extend32(value, 7);
+
+	return IIO_VAL_INT;
+}
+
+static int fxls8962af_get_axis(struct fxls8962af_data *data,
+			       struct iio_chan_spec const *chan, int *val)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	__le16 raw_val;
+	int ret;
+
+	ret = fxls8962af_drdy(data);
+	if (ret < 0)
+		return ret;
+
+	ret = fxls8962af_power_on(data);
+	if (ret)
+		return ret;
+
+	ret = regmap_bulk_read(data->regmap, chan->address,
+			       &raw_val, sizeof(raw_val));
+	if (ret < 0) {
+		dev_err(dev, "failed to read axes\n");
+		fxls8962af_power_off(data);
+		return ret;
+	}
+
+	fxls8962af_power_off(data);
+
+	*val = sign_extend32(le16_to_cpu(raw_val), chan->scan_type.realbits - 1);
+
+	return IIO_VAL_INT;
+}
+
+static int fxls8962af_read_avail(struct iio_dev *indio_dev,
+				 struct iio_chan_spec const *chan,
+				 const int **vals, int *type, int *length,
+				 long mask)
+{
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_INT_PLUS_NANO;
+		*vals = (int *)fxls8962af_scale_table;
+		*length = ARRAY_SIZE(fxls8962af_scale_table) * 2;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int fxls8962af_write_raw_get_fmt(struct iio_dev *indio_dev,
+					struct iio_chan_spec const *chan,
+					long mask)
+{
+	return IIO_VAL_INT_PLUS_NANO;
+}
+
+static int fxls8962af_standby(struct fxls8962af_data *data)
+{
+	return regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
+				  FXLS8962AF_SENS_CONFIG1_ACTIVE, 0);
+}
+
+static int fxls8962af_active(struct fxls8962af_data *data)
+{
+	return regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
+				  FXLS8962AF_SENS_CONFIG1_ACTIVE, 1);
+}
+
+static int fxls8962af_is_active(struct fxls8962af_data *data)
+{
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(data->regmap, FXLS8962AF_SENS_CONFIG1, &reg);
+	if (ret < 0)
+		return ret;
+
+	return reg & FXLS8962AF_SENS_CONFIG1_ACTIVE;
+}
+
+static int fxls8962af_update_config(struct fxls8962af_data *data, u8 reg,
+				    u8 mask, u8 val)
+{
+	int ret;
+	int is_active;
+
+	is_active = fxls8962af_is_active(data);
+	if (is_active) {
+		ret = fxls8962af_standby(data);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = regmap_update_bits(data->regmap, reg, mask, val);
+	if (ret < 0)
+		return ret;
+
+	if (is_active) {
+		ret = fxls8962af_active(data);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int fxls8962af_set_full_scale(struct fxls8962af_data *data, u32 scale)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(fxls8962af_scale_table); i++)
+		if (scale == fxls8962af_scale_table[i][1])
+			break;
+
+	if (i == ARRAY_SIZE(fxls8962af_scale_table))
+		return -EINVAL;
+
+	return fxls8962af_update_config(data, FXLS8962AF_SENS_CONFIG1,
+					FXLS8962AF_SC1_FSR_MASK,
+					FXLS8962AF_SC1_FSR_PREP(i));
+}
+
+static unsigned int fxls8962af_read_full_scale(struct fxls8962af_data *data,
+					       int *val)
+{
+	int ret;
+	unsigned int reg;
+	u8 range_idx;
+
+	ret = regmap_read(data->regmap, FXLS8962AF_SENS_CONFIG1, &reg);
+	if (ret < 0)
+		return ret;
+
+	range_idx = FXLS8962AF_SC1_FSR_GET(reg);
+
+	*val = fxls8962af_scale_table[range_idx][1];
+
+	return IIO_VAL_INT_PLUS_NANO;
+}
+
+static int fxls8962af_read_raw(struct iio_dev *indio_dev,
+			       struct iio_chan_spec const *chan,
+			       int *val, int *val2, long mask)
+{
+	struct fxls8962af_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		switch (chan->type) {
+		case IIO_TEMP:
+			ret = fxls8962af_get_temp(data, val);
+			break;
+		case IIO_ACCEL:
+			ret = fxls8962af_get_axis(data, chan, val);
+			break;
+		default:
+			ret = -EINVAL;
+		}
+
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+	case IIO_CHAN_INFO_OFFSET:
+		if (chan->type != IIO_TEMP)
+			return -EINVAL;
+
+		*val = FXLS8962AF_TEMP_CENTER_VAL;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 0;
+		return fxls8962af_read_full_scale(data, val2);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int fxls8962af_write_raw(struct iio_dev *indio_dev,
+				struct iio_chan_spec const *chan,
+				int val, int val2, long mask)
+{
+	struct fxls8962af_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		if (val != 0)
+			return -EINVAL;
+
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = fxls8962af_set_full_scale(data, val2);
+
+		iio_device_release_direct_mode(indio_dev);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+#define FXLS8962AF_CHANNEL(axis, reg, idx) { \
+	.type = IIO_ACCEL, \
+	.address = reg, \
+	.modified = 1, \
+	.channel2 = IIO_MOD_##axis, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE), \
+	.scan_index = idx, \
+	.scan_type = { \
+		.sign = 's', \
+		.realbits = 12, \
+		.storagebits = 16, \
+		.shift = 4, \
+		.endianness = IIO_BE, \
+	}, \
+}
+
+#define FXLS8962AF_TEMP_CHANNEL { \
+	.type = IIO_TEMP, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+			      BIT(IIO_CHAN_INFO_OFFSET),\
+	.scan_index = -1, \
+	.scan_type = { \
+		.realbits = 8, \
+	}, \
+}
+
+static const struct iio_chan_spec fxls8962af_channels[] = {
+	FXLS8962AF_CHANNEL(X, FXLS8962AF_OUT_X_LSB, fxls8962af_idx_x),
+	FXLS8962AF_CHANNEL(Y, FXLS8962AF_OUT_Y_LSB, fxls8962af_idx_y),
+	FXLS8962AF_CHANNEL(Z, FXLS8962AF_OUT_Z_LSB, fxls8962af_idx_z),
+	IIO_CHAN_SOFT_TIMESTAMP(fxls8962af_idx_ts),
+	FXLS8962AF_TEMP_CHANNEL,
+};
+
+static const struct fxls8962af_chip_info fxls_chip_info_table[] = {
+	[fxls8962af] = {
+		.chip_id = FXLS8962AF_DEVICE_ID,
+		.name = "fxls8962af",
+		.channels = fxls8962af_channels,
+		.num_channels = ARRAY_SIZE(fxls8962af_channels),
+	},
+	[fxls8964af] = {
+		.chip_id = FXLS8964AF_DEVICE_ID,
+		.name = "fxls8964af",
+		.channels = fxls8962af_channels,
+		.num_channels = ARRAY_SIZE(fxls8962af_channels),
+	},
+};
+
+static const struct iio_info fxls8962af_info = {
+	.read_raw = &fxls8962af_read_raw,
+	.write_raw = &fxls8962af_write_raw,
+	.write_raw_get_fmt = fxls8962af_write_raw_get_fmt,
+	.read_avail = fxls8962af_read_avail,
+};
+
+static int fxls8962af_reset(struct fxls8962af_data *data)
+{
+	struct device *dev = regmap_get_device(data->regmap);
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
+				 FXLS8962AF_SENS_CONFIG1_RST,
+				 FXLS8962AF_SENS_CONFIG1_RST);
+	if (ret < 0)
+		return ret;
+
+	/* TBOOT1, TBOOT2, specifies we have to wait between 1 - 17.7ms */
+	ret = regmap_read_poll_timeout(data->regmap, FXLS8962AF_INT_STATUS, reg,
+			(reg & FXLS8962AF_INT_STATUS_SRC_BOOT), 1000, 18000);
+	if (ret)
+		dev_err(dev, "reset timeout, int_status = 0x%x\n", reg);
+
+	return ret;
+}
+
+static void fxls8962af_regulator_disable(void *data_ptr)
+{
+	struct fxls8962af_data *data = data_ptr;
+
+	regulator_disable(data->vdd_reg);
+}
+
+static void fxls8962af_pm_disable(void *dev_ptr)
+{
+	struct device *dev = dev_ptr;
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+
+	pm_runtime_disable(dev);
+	pm_runtime_set_suspended(dev);
+	pm_runtime_put_noidle(dev);
+
+	fxls8962af_standby(iio_priv(indio_dev));
+}
+
+int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
+{
+	struct fxls8962af_data *data;
+	struct iio_dev *indio_dev;
+	unsigned int reg;
+	int ret, i;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	dev_set_drvdata(dev, indio_dev);
+	data->regmap = regmap;
+
+	ret = iio_read_mount_matrix(dev, "mount-matrix", &data->orientation);
+	if (ret)
+		return ret;
+
+	data->vdd_reg = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->vdd_reg))
+		return dev_err_probe(dev, PTR_ERR(data->vdd_reg),
+				     "Failed to get vdd regulator\n");
+
+	ret = regulator_enable(data->vdd_reg);
+	if (ret) {
+		dev_err(dev, "Failed to enable vdd regulator: %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, fxls8962af_regulator_disable, data);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(data->regmap, FXLS8962AF_WHO_AM_I, &reg);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(fxls_chip_info_table); i++) {
+		if (fxls_chip_info_table[i].chip_id == reg) {
+			data->chip_info = &fxls_chip_info_table[i];
+			break;
+		}
+	}
+	if (i == ARRAY_SIZE(fxls_chip_info_table)) {
+		dev_err(dev, "failed to match device in table\n");
+		return -ENXIO;
+	}
+
+	indio_dev->channels = data->chip_info->channels;
+	indio_dev->num_channels = data->chip_info->num_channels;
+	indio_dev->name = data->chip_info->name;
+	indio_dev->info = &fxls8962af_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = fxls8962af_reset(data);
+	if (ret < 0)
+		return ret;
+
+	ret = pm_runtime_set_active(dev);
+	if (ret < 0)
+		return ret;
+
+	pm_runtime_enable(dev);
+	pm_runtime_set_autosuspend_delay(dev, FXLS8962AF_AUTO_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+
+	ret = devm_add_action_or_reset(dev, fxls8962af_pm_disable, dev);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_GPL(fxls8962af_core_probe);
+
+static int __maybe_unused fxls8962af_runtime_suspend(struct device *dev)
+{
+	struct fxls8962af_data *data = iio_priv(dev_get_drvdata(dev));
+	int ret;
+
+	ret = fxls8962af_standby(data);
+	if (ret < 0) {
+		dev_err(dev, "powering off device failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __maybe_unused fxls8962af_runtime_resume(struct device *dev)
+{
+	struct fxls8962af_data *data = iio_priv(dev_get_drvdata(dev));
+
+	return fxls8962af_active(data);
+}
+
+const struct dev_pm_ops fxls8962af_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+	SET_RUNTIME_PM_OPS(fxls8962af_runtime_suspend,
+			   fxls8962af_runtime_resume, NULL)
+};
+EXPORT_SYMBOL_GPL(fxls8962af_pm_ops);
+
+MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
+MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/fxls8962af-i2c.c b/drivers/iio/accel/fxls8962af-i2c.c
new file mode 100644
index 000000000000..cba12160a714
--- /dev/null
+++ b/drivers/iio/accel/fxls8962af-i2c.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NXP FXLS8962AF/FXLS8964AF Accelerometer I2C Driver
+ *
+ * Copyright 2021 Connected Cars A/S
+ */
+
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "fxls8962af.h"
+
+static int fxls8962af_probe(struct i2c_client *client)
+{
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_i2c(client, &fxls8962af_regmap_conf);
+	if (IS_ERR(regmap)) {
+		dev_err(&client->dev, "Failed to initialize i2c regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return fxls8962af_core_probe(&client->dev, regmap, client->irq);
+}
+
+static const struct i2c_device_id fxls8962af_id[] = {
+	{"fxls8962af", fxls8962af},
+	{"fxls8964af", fxls8964af},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, fxls8962af_id);
+
+static const struct of_device_id fxls8962af_of_match[] = {
+	{.compatible = "nxp,fxls8962af"},
+	{.compatible = "nxp,fxls8964af"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, fxls8962af_of_match);
+
+static struct i2c_driver fxls8962af_driver = {
+	.driver = {
+		   .name = "fxls8962af_i2c",
+		   .of_match_table = fxls8962af_of_match,
+		   .pm = &fxls8962af_pm_ops,
+		   },
+	.probe_new = fxls8962af_probe,
+	.id_table = fxls8962af_id,
+};
+module_i2c_driver(fxls8962af_driver);
+
+MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
+MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/fxls8962af-spi.c b/drivers/iio/accel/fxls8962af-spi.c
new file mode 100644
index 000000000000..cb971b76d135
--- /dev/null
+++ b/drivers/iio/accel/fxls8962af-spi.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NXP FXLS8962AF/FXLS8964AF Accelerometer SPI Driver
+ *
+ * Copyright 2021 Connected Cars A/S
+ */
+
+#include <linux/dev_printk.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/spi/spi.h>
+#include <linux/regmap.h>
+
+#include "fxls8962af.h"
+
+static int fxls8962af_probe(struct spi_device *spi)
+{
+	struct regmap *regmap;
+
+	regmap = devm_regmap_init_spi(spi, &fxls8962af_regmap_conf);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return fxls8962af_core_probe(&spi->dev, regmap, spi->irq);
+}
+
+static const struct of_device_id fxls8962af_spi_of_match[] = {
+	{.compatible = "nxp,fxls8962af"},
+	{.compatible = "nxp,fxls8964af"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, fxls8962af_spi_of_match);
+
+static const struct spi_device_id fxls8962af_spi_id_table[] = {
+	{"fxls8962af", fxls8962af},
+	{"fxls8964af", fxls8964af},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, fxls8962af_spi_id_table);
+
+static struct spi_driver fxls8962af_driver = {
+	.driver = {
+		   .name = "fxls8962af_spi",
+		   .pm = &fxls8962af_pm_ops,
+		   .of_match_table = fxls8962af_spi_of_match,
+		   },
+	.probe = fxls8962af_probe,
+	.id_table = fxls8962af_spi_id_table,
+};
+module_spi_driver(fxls8962af_driver);
+
+MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
+MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/fxls8962af.h b/drivers/iio/accel/fxls8962af.h
new file mode 100644
index 000000000000..b67572c3ef06
--- /dev/null
+++ b/drivers/iio/accel/fxls8962af.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2021 Connected Cars A/S
+ */
+#ifndef _FXLS8962AF_H_
+#define _FXLS8962AF_H_
+
+struct regmap;
+struct device;
+
+enum {
+	fxls8962af,
+	fxls8964af,
+};
+
+int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq);
+int fxls8962af_core_remove(struct device *dev);
+
+extern const struct dev_pm_ops fxls8962af_pm_ops;
+extern const struct regmap_config fxls8962af_regmap_conf;
+
+#endif				/* _FXLS8962AF_H_ */
-- 
2.31.0

[PATCH v3 2/2] dt-bindings: iio: accel: fxls8962af: add bindings

[Sean Nyekjaer]

Add devicetree binding for the NXP FXLS8962AF/FXLS8964AF
accelerometer sensor.

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
---
Changes for v2:
 - removed requirement for interrupt

Changes for v3:
 - None

 .../bindings/iio/accel/nxp,fxls8962af.yaml    | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/accel/nxp,fxls8962af.yaml

diff --git a/Documentation/devicetree/bindings/iio/accel/nxp,fxls8962af.yaml b/Documentation/devicetree/bindings/iio/accel/nxp,fxls8962af.yaml
new file mode 100644
index 000000000000..c7be7a1679ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/accel/nxp,fxls8962af.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/accel/nxp,fxls8962af.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP FXLS8962AF/FXLS8964AF Accelerometer driver
+
+maintainers:
+  - Sean Nyekjaer <sean@geanix.com>
+
+description: |
+  NXP FXLS8962AF/FXLS8964AF Accelerometer driver that supports
+  SPI and I2C interface.
+    https://www.nxp.com/docs/en/data-sheet/FXLS8962AF.pdf
+    https://www.nxp.com/docs/en/data-sheet/FXLS8964AF.pdf
+
+properties:
+  compatible:
+    enum:
+      - nxp,fxls8962af
+      - nxp,fxls8964af
+
+  reg:
+    maxItems: 1
+
+  vdd-supply:
+    description: phandle to the regulator that provides power to the accelerometer
+
+  spi-max-frequency: true
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* Example for a I2C device node */
+        accelerometer@62 {
+            compatible = "nxp,fxls8962af";
+            reg = <0x62>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* Example for a SPI device node */
+        accelerometer@0 {
+            compatible = "nxp,fxls8962af";
+            reg = <0>;
+            spi-max-frequency = <4000000>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
-- 
2.31.0

Re: [PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[Sean Nyekjaer]

On 28/04/2021 10.01, Sean Nyekjaer wrote:
> |static int fxls8962af_read_raw(struct iio_dev *indio_dev, + struct 
> iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + 
> struct fxls8962af_data *data = iio_priv(indio_dev); + int ret; + + 
> switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = 
> iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + 
> switch (chan->type) { + case IIO_TEMP: + ret = 
> fxls8962af_get_temp(data, val); + break; + case IIO_ACCEL: + ret = 
> fxls8962af_get_axis(data, chan, val); + break; + default: + ret = 
> -EINVAL; + } + + iio_device_release_direct_mode(indio_dev); + return ret;|
|Maybe I should remove iio_device_claim_direct_mode() and release(),
there is actually nothing in the datasheet that block us from reading 
temp and raw
axis data with streaming enabled to the internal fifo.
We have a use-case for reading temperature data while streaming 
accelerometer data.

Could I just check for ||iio_buffer_enabled||() and skip the drdy and 
power_on/off in
||fxls8962af_get_temp() and ||fxls8962af_get_axis()||?

/Sean
|

Re: [PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[Jonathan Cameron]

On Wed, 28 Apr 2021 13:34:01 +0200
Sean Nyekjaer <sean@geanix.com> wrote:

> On 28/04/2021 10.01, Sean Nyekjaer wrote:
> > |static int fxls8962af_read_raw(struct iio_dev *indio_dev, + struct 
> > iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + 
> > struct fxls8962af_data *data = iio_priv(indio_dev); + int ret; + + 
> > switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = 
> > iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + 
> > switch (chan->type) { + case IIO_TEMP: + ret = 
> > fxls8962af_get_temp(data, val); + break; + case IIO_ACCEL: + ret = 
> > fxls8962af_get_axis(data, chan, val); + break; + default: + ret = 
> > -EINVAL; + } + + iio_device_release_direct_mode(indio_dev); + return ret;|  
> |Maybe I should remove iio_device_claim_direct_mode() and release(),
> there is actually nothing in the datasheet that block us from reading 
> temp and raw
> axis data with streaming enabled to the internal fifo.
> We have a use-case for reading temperature data while streaming 
> accelerometer data.
> 
> Could I just check for ||iio_buffer_enabled||() and skip the drdy and 
> power_on/off in
> ||fxls8962af_get_temp() and ||fxls8962af_get_axis()||?

Absolutely fine to have these enabled whilst doing fifo accesses as
long as they don't changing timing etc (they do on some devices).

Sounds like you'd need to reference count power_on / off rather than
basing it on whether the buffer is enabled (to avoid a race condition).

I think runtime pm should handle that for you anyway. 

> 
> /Sean
> |

Re: [PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[Jonathan Cameron]

On Wed, 28 Apr 2021 10:01:06 +0200
Sean Nyekjaer <sean@geanix.com> wrote:

> Add basic support for NXP FXLS8962AF/FXLS8964AF Automotive
> accelerometers.
> It will allow setting up scale/gain and reading x,y,z
> axis.
> 
> Datasheet: https://www.nxp.com/docs/en/data-sheet/FXLS8962AF.pdf
> Datasheet: https://www.nxp.com/docs/en/data-sheet/FXLS8964AF.pdf
> Signed-off-by: Sean Nyekjaer <sean@geanix.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

I took a closer look at read_raw flow as a result of your follow up
point about whether they needed to claim direct mode or not.
It raised a few questions.


Jonathan

> ---
> Changes for v2: 
>  - Addressed Kconfig comments
>  - Using regmap_read_poll_timeout()
>  - Addresed comments from Andy and Jonathan
> 
> Changes for v3:
>  - fixed Kconfig ordering
>  - read INT_STATUS after reset, to ensure the device is ready
>  - fixed a few xmas trees
>  - added datasheet tags 
> 
> I'm adding interrupt support RFC will be posted soonish :)

Very soonish as it turned out :)

> 
>  drivers/iio/accel/Kconfig           |  27 ++
>  drivers/iio/accel/Makefile          |   3 +
>  drivers/iio/accel/fxls8962af-core.c | 616 ++++++++++++++++++++++++++++
>  drivers/iio/accel/fxls8962af-i2c.c  |  57 +++
>  drivers/iio/accel/fxls8962af-spi.c  |  57 +++
>  drivers/iio/accel/fxls8962af.h      |  22 +
>  6 files changed, 782 insertions(+)
>  create mode 100644 drivers/iio/accel/fxls8962af-core.c
>  create mode 100644 drivers/iio/accel/fxls8962af-i2c.c
>  create mode 100644 drivers/iio/accel/fxls8962af-spi.c
>  create mode 100644 drivers/iio/accel/fxls8962af.h
> 
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 2e0c62c39155..7317d839ca1a 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -208,6 +208,33 @@ config DMARD10
>  	  Choosing M will build the driver as a module. If so, the module
>  	  will be called dmard10.
>  
> +config FXLS8962AF
> +	tristate
> +
> +config FXLS8962AF_I2C
> +	tristate "NXP FXLS8962AF/FXLS8964AF Accelerometer I2C Driver"
> +	depends on I2C
> +	select FXLS8962AF
> +	select REGMAP_I2C
> +	help
> +	  Say yes here to build support for the NXP 3-axis automotive
> +	  accelerometer FXLS8962AF/FXLS8964AF with I2C support.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called fxls8962af_i2c.
> +
> +config FXLS8962AF_SPI
> +	tristate "NXP FXLS8962AF/FXLS8964AF Accelerometer SPI Driver"
> +	depends on SPI
> +	select FXLS8962AF
> +	select REGMAP_SPI
> +	help
> +	  Say yes here to build support for the NXP 3-axis automotive
> +	  accelerometer FXLS8962AF/FXLS8964AF with SPI support.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called fxls8962af_spi.
> +
>  config HID_SENSOR_ACCEL_3D
>  	depends on HID_SENSOR_HUB
>  	select IIO_BUFFER
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 4f6c1ebe13b0..1b8c479c6f7c 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -25,6 +25,9 @@ obj-$(CONFIG_DA311)	+= da311.o
>  obj-$(CONFIG_DMARD06)	+= dmard06.o
>  obj-$(CONFIG_DMARD09)	+= dmard09.o
>  obj-$(CONFIG_DMARD10)	+= dmard10.o
> +obj-$(CONFIG_FXLS8962AF)	+= fxls8962af-core.o
> +obj-$(CONFIG_FXLS8962AF_I2C)	+= fxls8962af-i2c.o
> +obj-$(CONFIG_FXLS8962AF_SPI)	+= fxls8962af-spi.o
>  obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
>  obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
>  obj-$(CONFIG_KXSD9)	+= kxsd9.o
> diff --git a/drivers/iio/accel/fxls8962af-core.c b/drivers/iio/accel/fxls8962af-core.c
> new file mode 100644
> index 000000000000..b3b0169e6a17
> --- /dev/null
> +++ b/drivers/iio/accel/fxls8962af-core.c
> @@ -0,0 +1,616 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NXP FXLS8962AF/FXLS8964AF Accelerometer Core Driver
> + *
> + * Copyright 2021 Connected Cars A/S
> + *
> + * Datasheet:
> + * https://www.nxp.com/docs/en/data-sheet/FXLS8962AF.pdf
> + * https://www.nxp.com/docs/en/data-sheet/FXLS8964AF.pdf
> + *
> + * Errata:
> + * https://www.nxp.com/docs/en/errata/ES_FXLS8962AF.pdf
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +#include "fxls8962af.h"
> +
> +#define FXLS8962AF_INT_STATUS			0x00
> +#define FXLS8962AF_INT_STATUS_SRC_BOOT		BIT(0)
> +#define FXLS8962AF_INT_STATUS_SRC_DRDY		BIT(7)
> +#define FXLS8962AF_TEMP_OUT			0x01
> +#define FXLS8962AF_VECM_LSB			0x02
> +#define FXLS8962AF_OUT_X_LSB			0x04
> +#define FXLS8962AF_OUT_Y_LSB			0x06
> +#define FXLS8962AF_OUT_Z_LSB			0x08
> +#define FXLS8962AF_BUF_STATUS			0x0b
> +#define FXLS8962AF_BUF_X_LSB			0x0c
> +#define FXLS8962AF_BUF_Y_LSB			0x0e
> +#define FXLS8962AF_BUF_Z_LSB			0x10
> +
> +#define FXLS8962AF_PROD_REV			0x12
> +#define FXLS8962AF_WHO_AM_I			0x13
> +
> +#define FXLS8962AF_SYS_MODE			0x14
> +#define FXLS8962AF_SENS_CONFIG1			0x15
> +#define FXLS8962AF_SENS_CONFIG1_ACTIVE		BIT(0)
> +#define FXLS8962AF_SENS_CONFIG1_RST		BIT(7)
> +#define FXLS8962AF_SC1_FSR_MASK			GENMASK(2, 1)
> +#define FXLS8962AF_SC1_FSR_PREP(x)		FIELD_PREP(FXLS8962AF_SC1_FSR_MASK, x)
> +#define FXLS8962AF_SC1_FSR_GET(x)		FIELD_GET(FXLS8962AF_SC1_FSR_MASK, x)
> +
> +#define FXLS8962AF_SENS_CONFIG2			0x16
> +#define FXLS8962AF_SENS_CONFIG3			0x17
> +#define FXLS8962AF_SENS_CONFIG4			0x18
> +#define FXLS8962AF_SENS_CONFIG5			0x19
> +
> +#define FXLS8962AF_WAKE_IDLE_LSB		0x1b
> +#define FXLS8962AF_SLEEP_IDLE_LSB		0x1c
> +#define FXLS8962AF_ASLP_COUNT_LSB		0x1e
> +
> +#define FXLS8962AF_INT_EN			0x20
> +#define FXLS8962AF_INT_PIN_SEL			0x21
> +
> +#define FXLS8962AF_OFF_X			0x22
> +#define FXLS8962AF_OFF_Y			0x23
> +#define FXLS8962AF_OFF_Z			0x24
> +
> +#define FXLS8962AF_BUF_CONFIG1			0x26
> +#define FXLS8962AF_BUF_CONFIG2			0x27
> +
> +#define FXLS8962AF_ORIENT_STATUS		0x28
> +#define FXLS8962AF_ORIENT_CONFIG		0x29
> +#define FXLS8962AF_ORIENT_DBCOUNT		0x2a
> +#define FXLS8962AF_ORIENT_BF_ZCOMP		0x2b
> +#define FXLS8962AF_ORIENT_THS_REG		0x2c
> +
> +#define FXLS8962AF_SDCD_INT_SRC1		0x2d
> +#define FXLS8962AF_SDCD_INT_SRC2		0x2e
> +#define FXLS8962AF_SDCD_CONFIG1			0x2f
> +#define FXLS8962AF_SDCD_CONFIG2			0x30
> +#define FXLS8962AF_SDCD_OT_DBCNT		0x31
> +#define FXLS8962AF_SDCD_WT_DBCNT		0x32
> +#define FXLS8962AF_SDCD_LTHS_LSB		0x33
> +#define FXLS8962AF_SDCD_UTHS_LSB		0x35
> +
> +#define FXLS8962AF_SELF_TEST_CONFIG1		0x37
> +#define FXLS8962AF_SELF_TEST_CONFIG2		0x38
> +
> +#define FXLS8962AF_MAX_REG			0x38
> +
> +#define FXLS8962AF_DEVICE_ID			0x62
> +#define FXLS8964AF_DEVICE_ID			0x84
> +
> +/* Raw temp channel offset */
> +#define FXLS8962AF_TEMP_CENTER_VAL		25
> +
> +#define FXLS8962AF_AUTO_SUSPEND_DELAY_MS	2000
> +
> +#define FXLS8962AF_SCALE_TABLE_LEN		4
> +
> +static const int fxls8962af_scale_table[FXLS8962AF_SCALE_TABLE_LEN][2] = {
> +	{0, IIO_G_TO_M_S_2(980000)},
> +	{0, IIO_G_TO_M_S_2(1950000)},
> +	{0, IIO_G_TO_M_S_2(3910000)},
> +	{0, IIO_G_TO_M_S_2(7810000)},
> +};
> +
> +struct fxls8962af_chip_info {
> +	const char *name;
> +	const struct iio_chan_spec *channels;
> +	int num_channels;
> +	u8 chip_id;
> +};
> +
> +struct fxls8962af_data {
> +	struct regmap *regmap;
> +	const struct fxls8962af_chip_info *chip_info;
> +	struct regulator *vdd_reg;
> +	struct iio_mount_matrix orientation;
> +};
> +
> +const struct regmap_config fxls8962af_regmap_conf = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = FXLS8962AF_MAX_REG,
> +};
> +EXPORT_SYMBOL_GPL(fxls8962af_regmap_conf);
> +
> +enum {
> +	fxls8962af_idx_x,
> +	fxls8962af_idx_y,
> +	fxls8962af_idx_z,
> +	fxls8962af_idx_ts,
> +};
> +
> +static int fxls8962af_drdy(struct fxls8962af_data *data)

So this is ensuring a 'fresh' reading?  Given I think it is cleared on any
read at all from the device, it prevents us from doing more than one channel
reading per sample which seems unlikely to be the intent.

Normally, for polled reading via sysfs we don't really mind if the data is
potentially a little stale, though in this case we may be coming out of standby
so you might need do something to ensure reasonably up to date date.
One option would be to stash a timestamp and if it's too long ago then
do a wait for fresh data.  It seems overkill to wait for data in the runtime
resume itself, but that might not be too bad as will only occur at all if readings
are infrequent enough for autosuspend to kick in.

> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	unsigned int reg;
> +	int ret;
> +
> +	ret = regmap_read_poll_timeout(data->regmap, FXLS8962AF_INT_STATUS, reg,
> +			(reg & FXLS8962AF_INT_STATUS_SRC_DRDY), 20000, 2000000);
> +	if (ret) {
> +		dev_err(dev, "drdy timeout, int_status = 0x%x\n", reg);
> +	}
> +
> +	return ret;
> +}
> +
> +static int fxls8962af_power_on(struct fxls8962af_data *data)
> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(dev);

There is a new helper called pm_runtime_resume_and_get()
It will ensure that it doesn't hold a reference if the call fails,
simplifying the flow beyond here.

> +
> +	if (ret < 0) {
> +		dev_err(dev, "failed to power on\n");
> +		pm_runtime_put_noidle(dev);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int fxls8962af_power_off(struct fxls8962af_data *data)
> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	int ret;
> +
> +	pm_runtime_mark_last_busy(dev);
> +	ret = pm_runtime_put_autosuspend(dev);
> +
> +	if (ret < 0) {
> +		dev_err(dev, "failed to power off\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int fxls8962af_get_temp(struct fxls8962af_data *data, int *val)
> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	unsigned int value;
> +	int ret;
> +
> +	ret = fxls8962af_drdy(data);

I'm a little confused.  You check data is ready before calling power on
which could result in you moving from standby to active state?


> +	if (ret < 0)
> +		return ret;
> +
> +	ret = fxls8962af_power_on(data);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_read(data->regmap, FXLS8962AF_TEMP_OUT, &value);
> +	if (ret < 0) {
> +		dev_err(dev, "Error reading reg_temp\n");
> +		fxls8962af_power_off(data);
> +		return ret;
> +	}
> +
> +	fxls8962af_power_off(data);
> +
> +	*val = sign_extend32(value, 7);
> +
> +	return IIO_VAL_INT;
> +}
> +
> +static int fxls8962af_get_axis(struct fxls8962af_data *data,
> +			       struct iio_chan_spec const *chan, int *val)
> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	__le16 raw_val;
> +	int ret;
> +
> +	ret = fxls8962af_drdy(data);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = fxls8962af_power_on(data);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_bulk_read(data->regmap, chan->address,
> +			       &raw_val, sizeof(raw_val));
> +	if (ret < 0) {
> +		dev_err(dev, "failed to read axes\n");
> +		fxls8962af_power_off(data);
> +		return ret;
> +	}
> +
> +	fxls8962af_power_off(data);
> +
> +	*val = sign_extend32(le16_to_cpu(raw_val), chan->scan_type.realbits - 1);
> +
> +	return IIO_VAL_INT;
> +}
> +
> +static int fxls8962af_read_avail(struct iio_dev *indio_dev,
> +				 struct iio_chan_spec const *chan,
> +				 const int **vals, int *type, int *length,
> +				 long mask)
> +{
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		*type = IIO_VAL_INT_PLUS_NANO;
> +		*vals = (int *)fxls8962af_scale_table;
> +		*length = ARRAY_SIZE(fxls8962af_scale_table) * 2;
> +		return IIO_AVAIL_LIST;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int fxls8962af_write_raw_get_fmt(struct iio_dev *indio_dev,
> +					struct iio_chan_spec const *chan,
> +					long mask)
> +{
> +	return IIO_VAL_INT_PLUS_NANO;
> +}
> +
> +static int fxls8962af_standby(struct fxls8962af_data *data)
> +{
> +	return regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
> +				  FXLS8962AF_SENS_CONFIG1_ACTIVE, 0);
> +}
> +
> +static int fxls8962af_active(struct fxls8962af_data *data)
> +{
> +	return regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
> +				  FXLS8962AF_SENS_CONFIG1_ACTIVE, 1);
> +}
> +
> +static int fxls8962af_is_active(struct fxls8962af_data *data)
> +{
> +	unsigned int reg;
> +	int ret;
> +
> +	ret = regmap_read(data->regmap, FXLS8962AF_SENS_CONFIG1, &reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	return reg & FXLS8962AF_SENS_CONFIG1_ACTIVE;
> +}
> +
> +static int fxls8962af_update_config(struct fxls8962af_data *data, u8 reg,
> +				    u8 mask, u8 val)
> +{
> +	int ret;
> +	int is_active;
> +
> +	is_active = fxls8962af_is_active(data);
> +	if (is_active) {
> +		ret = fxls8962af_standby(data);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	ret = regmap_update_bits(data->regmap, reg, mask, val);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (is_active) {
> +		ret = fxls8962af_active(data);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int fxls8962af_set_full_scale(struct fxls8962af_data *data, u32 scale)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(fxls8962af_scale_table); i++)
> +		if (scale == fxls8962af_scale_table[i][1])
> +			break;
> +
> +	if (i == ARRAY_SIZE(fxls8962af_scale_table))
> +		return -EINVAL;
> +
> +	return fxls8962af_update_config(data, FXLS8962AF_SENS_CONFIG1,
> +					FXLS8962AF_SC1_FSR_MASK,
> +					FXLS8962AF_SC1_FSR_PREP(i));
> +}
> +
> +static unsigned int fxls8962af_read_full_scale(struct fxls8962af_data *data,
> +					       int *val)
> +{
> +	int ret;
> +	unsigned int reg;
> +	u8 range_idx;
> +
> +	ret = regmap_read(data->regmap, FXLS8962AF_SENS_CONFIG1, &reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	range_idx = FXLS8962AF_SC1_FSR_GET(reg);
> +
> +	*val = fxls8962af_scale_table[range_idx][1];
> +
> +	return IIO_VAL_INT_PLUS_NANO;
> +}
> +
> +static int fxls8962af_read_raw(struct iio_dev *indio_dev,
> +			       struct iio_chan_spec const *chan,
> +			       int *val, int *val2, long mask)
> +{
> +	struct fxls8962af_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = iio_device_claim_direct_mode(indio_dev);
> +		if (ret)
> +			return ret;
> +
> +		switch (chan->type) {
> +		case IIO_TEMP:
> +			ret = fxls8962af_get_temp(data, val);
> +			break;
> +		case IIO_ACCEL:
> +			ret = fxls8962af_get_axis(data, chan, val);
> +			break;
> +		default:
> +			ret = -EINVAL;
> +		}
> +
> +		iio_device_release_direct_mode(indio_dev);
> +		return ret;
> +	case IIO_CHAN_INFO_OFFSET:
> +		if (chan->type != IIO_TEMP)
> +			return -EINVAL;
> +
> +		*val = FXLS8962AF_TEMP_CENTER_VAL;
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = 0;
> +		return fxls8962af_read_full_scale(data, val2);
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int fxls8962af_write_raw(struct iio_dev *indio_dev,
> +				struct iio_chan_spec const *chan,
> +				int val, int val2, long mask)
> +{
> +	struct fxls8962af_data *data = iio_priv(indio_dev);
> +	int ret;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SCALE:
> +		if (val != 0)
> +			return -EINVAL;
> +
> +		ret = iio_device_claim_direct_mode(indio_dev);
> +		if (ret)
> +			return ret;
> +
> +		ret = fxls8962af_set_full_scale(data, val2);
> +
> +		iio_device_release_direct_mode(indio_dev);
> +		return ret;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +#define FXLS8962AF_CHANNEL(axis, reg, idx) { \
> +	.type = IIO_ACCEL, \
> +	.address = reg, \
> +	.modified = 1, \
> +	.channel2 = IIO_MOD_##axis, \
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> +	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE), \
> +	.scan_index = idx, \
> +	.scan_type = { \
> +		.sign = 's', \
> +		.realbits = 12, \
> +		.storagebits = 16, \
> +		.shift = 4, \
> +		.endianness = IIO_BE, \
> +	}, \
> +}
> +
> +#define FXLS8962AF_TEMP_CHANNEL { \
> +	.type = IIO_TEMP, \
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> +			      BIT(IIO_CHAN_INFO_OFFSET),\
> +	.scan_index = -1, \
> +	.scan_type = { \
> +		.realbits = 8, \
> +	}, \
> +}
> +
> +static const struct iio_chan_spec fxls8962af_channels[] = {
> +	FXLS8962AF_CHANNEL(X, FXLS8962AF_OUT_X_LSB, fxls8962af_idx_x),
> +	FXLS8962AF_CHANNEL(Y, FXLS8962AF_OUT_Y_LSB, fxls8962af_idx_y),
> +	FXLS8962AF_CHANNEL(Z, FXLS8962AF_OUT_Z_LSB, fxls8962af_idx_z),
> +	IIO_CHAN_SOFT_TIMESTAMP(fxls8962af_idx_ts),
> +	FXLS8962AF_TEMP_CHANNEL,
> +};
> +
> +static const struct fxls8962af_chip_info fxls_chip_info_table[] = {
> +	[fxls8962af] = {
> +		.chip_id = FXLS8962AF_DEVICE_ID,
> +		.name = "fxls8962af",
> +		.channels = fxls8962af_channels,
> +		.num_channels = ARRAY_SIZE(fxls8962af_channels),
> +	},
> +	[fxls8964af] = {
> +		.chip_id = FXLS8964AF_DEVICE_ID,
> +		.name = "fxls8964af",
> +		.channels = fxls8962af_channels,
> +		.num_channels = ARRAY_SIZE(fxls8962af_channels),
> +	},
> +};
> +
> +static const struct iio_info fxls8962af_info = {
> +	.read_raw = &fxls8962af_read_raw,
> +	.write_raw = &fxls8962af_write_raw,
> +	.write_raw_get_fmt = fxls8962af_write_raw_get_fmt,
> +	.read_avail = fxls8962af_read_avail,
> +};
> +
> +static int fxls8962af_reset(struct fxls8962af_data *data)
> +{
> +	struct device *dev = regmap_get_device(data->regmap);
> +	unsigned int reg;
> +	int ret;
> +
> +	ret = regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG1,
> +				 FXLS8962AF_SENS_CONFIG1_RST,
> +				 FXLS8962AF_SENS_CONFIG1_RST);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* TBOOT1, TBOOT2, specifies we have to wait between 1 - 17.7ms */
> +	ret = regmap_read_poll_timeout(data->regmap, FXLS8962AF_INT_STATUS, reg,
> +			(reg & FXLS8962AF_INT_STATUS_SRC_BOOT), 1000, 18000);
> +	if (ret)
> +		dev_err(dev, "reset timeout, int_status = 0x%x\n", reg);
> +
> +	return ret;
> +}
> +
> +static void fxls8962af_regulator_disable(void *data_ptr)
> +{
> +	struct fxls8962af_data *data = data_ptr;
> +
> +	regulator_disable(data->vdd_reg);
> +}
> +
> +static void fxls8962af_pm_disable(void *dev_ptr)
> +{
> +	struct device *dev = dev_ptr;
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +
> +	pm_runtime_disable(dev);
> +	pm_runtime_set_suspended(dev);
> +	pm_runtime_put_noidle(dev);
> +
> +	fxls8962af_standby(iio_priv(indio_dev));
> +}
> +
> +int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
> +{
> +	struct fxls8962af_data *data;
> +	struct iio_dev *indio_dev;
> +	unsigned int reg;
> +	int ret, i;
> +
> +	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	data = iio_priv(indio_dev);
> +	dev_set_drvdata(dev, indio_dev);
> +	data->regmap = regmap;
> +
> +	ret = iio_read_mount_matrix(dev, "mount-matrix", &data->orientation);
> +	if (ret)
> +		return ret;
> +
> +	data->vdd_reg = devm_regulator_get(dev, "vdd");
> +	if (IS_ERR(data->vdd_reg))
> +		return dev_err_probe(dev, PTR_ERR(data->vdd_reg),
> +				     "Failed to get vdd regulator\n");
> +
> +	ret = regulator_enable(data->vdd_reg);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable vdd regulator: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = devm_add_action_or_reset(dev, fxls8962af_regulator_disable, data);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_read(data->regmap, FXLS8962AF_WHO_AM_I, &reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(fxls_chip_info_table); i++) {
> +		if (fxls_chip_info_table[i].chip_id == reg) {
> +			data->chip_info = &fxls_chip_info_table[i];
> +			break;
> +		}
> +	}
> +	if (i == ARRAY_SIZE(fxls_chip_info_table)) {
> +		dev_err(dev, "failed to match device in table\n");
> +		return -ENXIO;
> +	}
> +
> +	indio_dev->channels = data->chip_info->channels;
> +	indio_dev->num_channels = data->chip_info->num_channels;
> +	indio_dev->name = data->chip_info->name;
> +	indio_dev->info = &fxls8962af_info;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	ret = fxls8962af_reset(data);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = pm_runtime_set_active(dev);
> +	if (ret < 0)
> +		return ret;
> +
> +	pm_runtime_enable(dev);
> +	pm_runtime_set_autosuspend_delay(dev, FXLS8962AF_AUTO_SUSPEND_DELAY_MS);
> +	pm_runtime_use_autosuspend(dev);
> +
> +	ret = devm_add_action_or_reset(dev, fxls8962af_pm_disable, dev);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(dev, indio_dev);
> +}
> +EXPORT_SYMBOL_GPL(fxls8962af_core_probe);
> +
> +static int __maybe_unused fxls8962af_runtime_suspend(struct device *dev)
> +{
> +	struct fxls8962af_data *data = iio_priv(dev_get_drvdata(dev));
> +	int ret;
> +
> +	ret = fxls8962af_standby(data);
> +	if (ret < 0) {
> +		dev_err(dev, "powering off device failed\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused fxls8962af_runtime_resume(struct device *dev)
> +{
> +	struct fxls8962af_data *data = iio_priv(dev_get_drvdata(dev));
> +
> +	return fxls8962af_active(data);
> +}
> +
> +const struct dev_pm_ops fxls8962af_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				pm_runtime_force_resume)
> +	SET_RUNTIME_PM_OPS(fxls8962af_runtime_suspend,
> +			   fxls8962af_runtime_resume, NULL)
> +};
> +EXPORT_SYMBOL_GPL(fxls8962af_pm_ops);
> +
> +MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
> +MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/fxls8962af-i2c.c b/drivers/iio/accel/fxls8962af-i2c.c
> new file mode 100644
> index 000000000000..cba12160a714
> --- /dev/null
> +++ b/drivers/iio/accel/fxls8962af-i2c.c
> @@ -0,0 +1,57 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NXP FXLS8962AF/FXLS8964AF Accelerometer I2C Driver
> + *
> + * Copyright 2021 Connected Cars A/S
> + */
> +
> +#include <linux/dev_printk.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "fxls8962af.h"
> +
> +static int fxls8962af_probe(struct i2c_client *client)
> +{
> +	struct regmap *regmap;
> +
> +	regmap = devm_regmap_init_i2c(client, &fxls8962af_regmap_conf);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&client->dev, "Failed to initialize i2c regmap\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	return fxls8962af_core_probe(&client->dev, regmap, client->irq);
> +}
> +
> +static const struct i2c_device_id fxls8962af_id[] = {
> +	{"fxls8962af", fxls8962af},
> +	{"fxls8964af", fxls8964af},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(i2c, fxls8962af_id);
> +
> +static const struct of_device_id fxls8962af_of_match[] = {
> +	{.compatible = "nxp,fxls8962af"},
> +	{.compatible = "nxp,fxls8964af"},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, fxls8962af_of_match);
> +
> +static struct i2c_driver fxls8962af_driver = {
> +	.driver = {
> +		   .name = "fxls8962af_i2c",
> +		   .of_match_table = fxls8962af_of_match,
> +		   .pm = &fxls8962af_pm_ops,
> +		   },
> +	.probe_new = fxls8962af_probe,
> +	.id_table = fxls8962af_id,
> +};
> +module_i2c_driver(fxls8962af_driver);
> +
> +MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
> +MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer i2c driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/fxls8962af-spi.c b/drivers/iio/accel/fxls8962af-spi.c
> new file mode 100644
> index 000000000000..cb971b76d135
> --- /dev/null
> +++ b/drivers/iio/accel/fxls8962af-spi.c
> @@ -0,0 +1,57 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * NXP FXLS8962AF/FXLS8964AF Accelerometer SPI Driver
> + *
> + * Copyright 2021 Connected Cars A/S
> + */
> +
> +#include <linux/dev_printk.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/spi/spi.h>
> +#include <linux/regmap.h>
> +
> +#include "fxls8962af.h"
> +
> +static int fxls8962af_probe(struct spi_device *spi)
> +{
> +	struct regmap *regmap;
> +
> +	regmap = devm_regmap_init_spi(spi, &fxls8962af_regmap_conf);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	return fxls8962af_core_probe(&spi->dev, regmap, spi->irq);
> +}
> +
> +static const struct of_device_id fxls8962af_spi_of_match[] = {
> +	{.compatible = "nxp,fxls8962af"},
> +	{.compatible = "nxp,fxls8964af"},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, fxls8962af_spi_of_match);
> +
> +static const struct spi_device_id fxls8962af_spi_id_table[] = {
> +	{"fxls8962af", fxls8962af},
> +	{"fxls8964af", fxls8964af},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(spi, fxls8962af_spi_id_table);
> +
> +static struct spi_driver fxls8962af_driver = {
> +	.driver = {
> +		   .name = "fxls8962af_spi",
> +		   .pm = &fxls8962af_pm_ops,
> +		   .of_match_table = fxls8962af_spi_of_match,
> +		   },
> +	.probe = fxls8962af_probe,
> +	.id_table = fxls8962af_spi_id_table,
> +};
> +module_spi_driver(fxls8962af_driver);
> +
> +MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.com>");
> +MODULE_DESCRIPTION("NXP FXLS8962AF/FXLS8964AF accelerometer spi driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/fxls8962af.h b/drivers/iio/accel/fxls8962af.h
> new file mode 100644
> index 000000000000..b67572c3ef06
> --- /dev/null
> +++ b/drivers/iio/accel/fxls8962af.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright 2021 Connected Cars A/S
> + */
> +#ifndef _FXLS8962AF_H_
> +#define _FXLS8962AF_H_
> +
> +struct regmap;
> +struct device;
> +
> +enum {
> +	fxls8962af,
> +	fxls8964af,
> +};
> +
> +int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq);
> +int fxls8962af_core_remove(struct device *dev);
> +
> +extern const struct dev_pm_ops fxls8962af_pm_ops;
> +extern const struct regmap_config fxls8962af_regmap_conf;
> +
> +#endif				/* _FXLS8962AF_H_ */

Re: [PATCH v3 1/2] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers

[Sean Nyekjaer]

On 28/04/2021 16.19, Jonathan Cameron wrote:
>> +static int fxls8962af_get_temp(struct fxls8962af_data *data, int *val)
>> +{
>> +	struct device *dev = regmap_get_device(data->regmap);
>> +	unsigned int value;
>> +	int ret;
>> +
>> +	ret = fxls8962af_drdy(data);
> I'm a little confused.  You check data is ready before calling power on
> which could result in you moving from standby to active state?
>
>
Reading it again, I would definitively move it around :)
When testing it looks like we currently are getting the last sample from 
active state.

/Sean