RE: [PATCH 1/2] iio: frequency: admv1013: add support for ADMV1013

["Sa, Nuno" <Nuno.Sa@analog.com>]

> -----Original Message-----
> From: Antoniu Miclaus <antoniu.miclaus@analog.com>
> Sent: Tuesday, October 26, 2021 5:28 PM
> To: jic23@kernel.org; robh+dt@kernel.org; linux-iio@vger.kernel.org;
> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org
> Cc: Miclaus, Antoniu <Antoniu.Miclaus@analog.com>
> Subject: [PATCH 1/2] iio: frequency: admv1013: add support for
> ADMV1013
> 
> [External]
> 
> The ADMV1013 is a wideband, microwave upconverter optimized
> for point to point microwave radio designs operating in the
> 24 GHz to 44 GHz radio frequency (RF) range.
> 
> Datasheet:
> https://www.analog.com/media/en/technical-documentation/data-
> sheets/ADMV1013.pdf
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
>  drivers/iio/frequency/Kconfig    |  13 +
>  drivers/iio/frequency/Makefile   |   1 +
>  drivers/iio/frequency/admv1013.c | 579
> +++++++++++++++++++++++++++++++
>  3 files changed, 593 insertions(+)
>  create mode 100644 drivers/iio/frequency/admv1013.c
> 
> diff --git a/drivers/iio/frequency/Kconfig
> b/drivers/iio/frequency/Kconfig
> index 240b81502512..11792a5e7b83 100644
> --- a/drivers/iio/frequency/Kconfig
> +++ b/drivers/iio/frequency/Kconfig
> @@ -49,5 +49,18 @@ config ADF4371
> 
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called adf4371.
> +
> +config ADMV1013
> +	tristate "Analog Devices ADMV1013 Microwave Upconverter"
> +	depends on SPI
> +	depends on COMMON_CLK
> +	depends on 64BIT

This can be 'depends on SPI && COMMON_CLK && 64BIT'

> +	help
> +	  Say yes here to build support for Analog Devices ADMV1013
> +	  24 GHz to 44 GHz, Wideband, Microwave Upconverter.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called admv1013.
> +
>  endmenu
>  endmenu
> diff --git a/drivers/iio/frequency/Makefile
> b/drivers/iio/frequency/Makefile
> index 518b1e50caef..559922a8196e 100644
> --- a/drivers/iio/frequency/Makefile
> +++ b/drivers/iio/frequency/Makefile
> @@ -7,3 +7,4 @@
>  obj-$(CONFIG_AD9523) += ad9523.o
>  obj-$(CONFIG_ADF4350) += adf4350.o
>  obj-$(CONFIG_ADF4371) += adf4371.o
> +obj-$(CONFIG_ADMV1013) += admv1013.o
> diff --git a/drivers/iio/frequency/admv1013.c
> b/drivers/iio/frequency/admv1013.c
> new file mode 100644
> index 000000000000..1d46f96afc23
> --- /dev/null
> +++ b/drivers/iio/frequency/admv1013.c
> @@ -0,0 +1,579 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADMV1013 driver
> + *
> + * Copyright 2021 Analog Devices Inc.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bitops.h>
> +#include <linux/bits.h>
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/iio/iio.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +
> +#include <asm/unaligned.h>
> +
> +/* ADMV1013 Register Map */
> +#define ADMV1013_REG_SPI_CONTROL		0x00
> +#define ADMV1013_REG_ALARM			0x01
> +#define ADMV1013_REG_ALARM_MASKS		0x02
> +#define ADMV1013_REG_ENABLE			0x03
> +#define ADMV1013_REG_LO_AMP_I			0x05
> +#define ADMV1013_REG_LO_AMP_Q			0x06
> +#define ADMV1013_REG_OFFSET_ADJUST_I		0x07
> +#define ADMV1013_REG_OFFSET_ADJUST_Q		0x08
> +#define ADMV1013_REG_QUAD			0x09
> +#define ADMV1013_REG_VVA_TEMP_COMP		0x0A
> +
> +/* ADMV1013_REG_SPI_CONTROL Map */
> +#define ADMV1013_PARITY_EN_MSK			BIT(15)
> +#define ADMV1013_SPI_SOFT_RESET_MSK		BIT(14)
> +#define ADMV1013_CHIP_ID_MSK			GENMASK(11, 4)
> +#define ADMV1013_CHIP_ID			0xA
> +#define ADMV1013_REVISION_ID_MSK		GENMASK(3, 0)
> +
> +/* ADMV1013_REG_ALARM Map */
> +#define ADMV1013_PARITY_ERROR_MSK		BIT(15)
> +#define ADMV1013_TOO_FEW_ERRORS_MSK		BIT(14)
> +#define ADMV1013_TOO_MANY_ERRORS_MSK		BIT(13)
> +#define ADMV1013_ADDRESS_RANGE_ERROR_MSK	BIT(12)
> +
> +/* ADMV1013_REG_ENABLE Map */
> +#define ADMV1013_VGA_PD_MSK			BIT(15)
> +#define ADMV1013_MIXER_PD_MSK			BIT(14)
> +#define ADMV1013_QUAD_PD_MSK
> 	GENMASK(13, 11)
> +#define ADMV1013_BG_PD_MSK			BIT(10)
> +#define ADMV1013_MIXER_IF_EN_MSK		BIT(7)
> +#define ADMV1013_DET_EN_MSK			BIT(5)
> +
> +/* ADMV1013_REG_LO_AMP_I Map */
> +#define ADMV1013_LOAMP_PH_ADJ_I_FINE_MSK	GENMASK(13, 7)
> +#define ADMV1013_MIXER_VGATE_MSK		GENMASK(6, 0)
> +
> +/* ADMV1013_REG_LO_AMP_Q Map */
> +#define ADMV1013_LOAMP_PH_ADJ_Q_FINE_MSK	GENMASK(13, 7)
> +
> +/* ADMV1013_REG_OFFSET_ADJUST_I Map */
> +#define ADMV1013_MIXER_OFF_ADJ_I_P_MSK
> 	GENMASK(15, 9)
> +#define ADMV1013_MIXER_OFF_ADJ_I_N_MSK
> 	GENMASK(8, 2)
> +
> +/* ADMV1013_REG_OFFSET_ADJUST_Q Map */
> +#define ADMV1013_MIXER_OFF_ADJ_Q_P_MSK
> 	GENMASK(15, 9)
> +#define ADMV1013_MIXER_OFF_ADJ_Q_N_MSK
> 	GENMASK(8, 2)
> +
> +/* ADMV1013_REG_QUAD Map */
> +#define ADMV1013_QUAD_SE_MODE_MSK		GENMASK(9, 6)
> +#define ADMV1013_QUAD_FILTERS_MSK		GENMASK(3, 0)
> +
> +/* ADMV1013_REG_VVA_TEMP_COMP Map */
> +#define ADMV1013_VVA_TEMP_COMP_MSK
> 	GENMASK(15, 0)
> +
> +struct admv1013_state {
> +	struct spi_device	*spi;
> +	struct clk		*clkin;
> +	/* Protect against concurrent accesses to the device */
> +	struct mutex		lock;
> +	struct regulator	*reg;
> +	struct notifier_block	nb;
> +	unsigned int		quad_se_mode;
> +	bool			vga_pd;
> +	bool			mixer_pd;
> +	bool			quad_pd;
> +	bool			bg_pd;
> +	bool			mixer_if_en;
> +	bool			det_en;
> +	u8			data[3] ____cacheline_aligned;
> +};
> +
> +static int __admv1013_spi_read(struct admv1013_state *st, unsigned
> int reg,
> +			       unsigned int *val)
> +{
> +	int ret;
> +	struct spi_transfer t = {0};
> +
> +	st->data[0] = 0x80 | (reg << 1);
> +	st->data[1] = 0x0;
> +	st->data[2] = 0x0;
> +
> +	t.rx_buf = &st->data[0];
> +	t.tx_buf = &st->data[0];
> +	t.len = 3;
> +
> +	ret = spi_sync_transfer(st->spi, &t, 1);
> +	if (ret)
> +		return ret;
> +
> +	*val = (get_unaligned_be24(&st->data[0]) >> 1) &
> GENMASK(15, 0);
> +
> +	return ret;
> +}
> +
> +static int admv1013_spi_read(struct admv1013_state *st, unsigned
> int reg,
> +			     unsigned int *val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __admv1013_spi_read(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __admv1013_spi_write(struct admv1013_state *st,
> +				unsigned int reg,
> +				unsigned int val)
> +{
> +	put_unaligned_be24((val << 1) | (reg << 17), &st->data[0]);
> +
> +	return spi_write(st->spi, &st->data[0], 3);
> +}
> +
> +static int admv1013_spi_write(struct admv1013_state *st, unsigned
> int reg,
> +			      unsigned int val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __admv1013_spi_write(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __admv1013_spi_update_bits(struct admv1013_state *st,
> unsigned int reg,
> +				      unsigned int mask, unsigned int val)
> +{
> +	int ret;
> +	unsigned int data, temp;
> +
> +	ret = __admv1013_spi_read(st, reg, &data);
> +	if (ret)
> +		return ret;
> +
> +	temp = (data & ~mask) | (val & mask);
> +
> +	return __admv1013_spi_write(st, reg, temp);
> +}
> +
> +static int admv1013_spi_update_bits(struct admv1013_state *st,
> unsigned int reg,
> +				    unsigned int mask, unsigned int val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __admv1013_spi_update_bits(st, reg, mask, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int admv1013_read_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int *val, int *val2, long info)
> +{
> +	struct admv1013_state *st = iio_priv(indio_dev);
> +	unsigned int data;
> +	int ret;
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_OFFSET:
> +		if (chan->channel2 == IIO_MOD_I) {
> +			ret = admv1013_spi_read(st,
> ADMV1013_REG_OFFSET_ADJUST_I, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val =
> FIELD_GET(ADMV1013_MIXER_OFF_ADJ_I_P_MSK, data);
> +			*val2 =
> FIELD_GET(ADMV1013_MIXER_OFF_ADJ_I_N_MSK, data);
> +		} else {
> +			ret = admv1013_spi_read(st,
> ADMV1013_REG_OFFSET_ADJUST_Q, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val =
> FIELD_GET(ADMV1013_MIXER_OFF_ADJ_Q_P_MSK, data);
> +			*val2 =
> FIELD_GET(ADMV1013_MIXER_OFF_ADJ_Q_N_MSK, data);
> +		}
> +
> +		return IIO_VAL_INT_MULTIPLE;
> +	case IIO_CHAN_INFO_PHASE:
> +		if (chan->channel2 == IIO_MOD_I) {
> +			ret = admv1013_spi_read(st,
> ADMV1013_REG_LO_AMP_I, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val =
> FIELD_GET(ADMV1013_LOAMP_PH_ADJ_I_FINE_MSK, data);
> +		} else {
> +			ret = admv1013_spi_read(st,
> ADMV1013_REG_LO_AMP_Q, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val =
> FIELD_GET(ADMV1013_LOAMP_PH_ADJ_Q_FINE_MSK, data);
> +		}
> +
> +		return IIO_VAL_INT;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int admv1013_write_raw(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan,
> +			      int val, int val2, long info)
> +{
> +	struct admv1013_state *st = iio_priv(indio_dev);
> +	int ret;
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_OFFSET:
> +		val2 /= 100000;
> +
> +		if (chan->channel2 == IIO_MOD_I)
> +			ret = admv1013_spi_update_bits(st,
> ADMV1013_REG_OFFSET_ADJUST_I,
> +
> ADMV1013_MIXER_OFF_ADJ_I_P_MSK |
> +
> ADMV1013_MIXER_OFF_ADJ_I_N_MSK,
> +
> FIELD_PREP(ADMV1013_MIXER_OFF_ADJ_I_P_MSK, val) |
> +
> FIELD_PREP(ADMV1013_MIXER_OFF_ADJ_I_N_MSK, val2));
> +		else
> +			ret = admv1013_spi_update_bits(st,
> ADMV1013_REG_OFFSET_ADJUST_Q,
> +
> ADMV1013_MIXER_OFF_ADJ_Q_P_MSK |
> +
> ADMV1013_MIXER_OFF_ADJ_Q_N_MSK,
> +
> FIELD_PREP(ADMV1013_MIXER_OFF_ADJ_Q_P_MSK, val) |
> +
> FIELD_PREP(ADMV1013_MIXER_OFF_ADJ_Q_N_MSK, val2));
> +
> +		return ret;
> +	case IIO_CHAN_INFO_PHASE:
> +		if (chan->channel2 == IIO_MOD_I)
> +			return admv1013_spi_update_bits(st,
> ADMV1013_REG_LO_AMP_I,
> +
> 	ADMV1013_LOAMP_PH_ADJ_I_FINE_MSK,
> +
> 	FIELD_PREP(ADMV1013_LOAMP_PH_ADJ_I_FINE_MSK, val));
> +		else
> +			return admv1013_spi_update_bits(st,
> ADMV1013_REG_LO_AMP_Q,
> +
> 	ADMV1013_LOAMP_PH_ADJ_Q_FINE_MSK,
> +
> 	FIELD_PREP(ADMV1013_LOAMP_PH_ADJ_Q_FINE_MSK, val));
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int admv1013_update_quad_filters(struct admv1013_state *st)
> +{
> +	unsigned int filt_raw;
> +	u64 rate = clk_get_rate(st->clkin);
> +
> +	if (rate >= 5400000000 && rate <= 7000000000)
> +		filt_raw = 15;
> +	else if (rate >= 5400000000 && rate <= 8000000000)
> +		filt_raw = 10;
> +	else if (rate >= 6600000000 && rate <= 9200000000)
> +		filt_raw = 5;
> +	else
> +		filt_raw = 0;
> +
> +	return __admv1013_spi_update_bits(st,
> ADMV1013_REG_QUAD,
> +
> 	ADMV1013_QUAD_FILTERS_MSK,
> +
> 	FIELD_PREP(ADMV1013_QUAD_FILTERS_MSK, filt_raw));
> +}
> +
> +static int admv1013_update_mixer_vgate(struct admv1013_state *st)
> +{
> +	unsigned int vcm, mixer_vgate;
> +
> +	vcm = regulator_get_voltage(st->reg);
> +
> +	if (vcm >= 0 && vcm < 1800000)
> +		mixer_vgate = (2389 * vcm / 1000000 + 8100) / 100;
> +	else if (vcm > 1800000 && vcm < 2600000)
> +		mixer_vgate = (2375 * vcm / 1000000 + 125) / 100;
> +	else
> +		return -EINVAL;
> +
> +	return __admv1013_spi_update_bits(st,
> ADMV1013_REG_LO_AMP_I,
> +				 ADMV1013_MIXER_VGATE_MSK,
> +
> FIELD_PREP(ADMV1013_MIXER_VGATE_MSK, mixer_vgate));
> +}
> +
> +static int admv1013_reg_access(struct iio_dev *indio_dev,
> +			       unsigned int reg,
> +			       unsigned int write_val,
> +			       unsigned int *read_val)
> +{
> +	struct admv1013_state *st = iio_priv(indio_dev);
> +	int ret;
> +
> +	if (read_val)
> +		ret = admv1013_spi_read(st, reg, read_val);
> +	else
> +		ret = admv1013_spi_write(st, reg, write_val);
> +
> +	return ret;
> +}
> +
> +static const struct iio_info admv1013_info = {
> +	.read_raw = admv1013_read_raw,
> +	.write_raw = admv1013_write_raw,
> +	.debugfs_reg_access = &admv1013_reg_access,
> +};
> +
> +static int admv1013_freq_change(struct notifier_block *nb, unsigned
> long action, void *data)
> +{
> +	struct admv1013_state *st = container_of(nb, struct
> admv1013_state, nb);
> +	int ret;
> +
> +	if (action == POST_RATE_CHANGE) {
> +		mutex_lock(&st->lock);
> +		ret =
> notifier_from_errno(admv1013_update_quad_filters(st));
> +		mutex_unlock(&st->lock);
> +		return ret;
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
> +static void admv1013_clk_notifier_unreg(void *data)
> +{
> +	struct admv1013_state *st = data;
> +
> +	clk_notifier_unregister(st->clkin, &st->nb);
> +}
> +
> +#define ADMV1013_CHAN(_channel, rf_comp) {			\
> +	.type = IIO_ALTVOLTAGE,					\
> +	.modified = 1,						\
> +	.output = 1,						\
> +	.indexed = 1,						\
> +	.channel2 = IIO_MOD_##rf_comp,				\
> +	.channel = _channel,					\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_PHASE) |	\
> +		BIT(IIO_CHAN_INFO_OFFSET)			\
> +	}
> +
> +static const struct iio_chan_spec admv1013_channels[] = {
> +	ADMV1013_CHAN(0, I),
> +	ADMV1013_CHAN(0, Q),
> +};
> +
> +static int admv1013_init(struct admv1013_state *st)
> +{
> +	int ret;
> +	unsigned int chip_id, enable_reg, enable_reg_msk;
> +	struct spi_device *spi = st->spi;
> +
> +	/* Perform a software reset */
> +	ret = __admv1013_spi_update_bits(st,
> ADMV1013_REG_SPI_CONTROL,
> +
> ADMV1013_SPI_SOFT_RESET_MSK,
> +
> FIELD_PREP(ADMV1013_SPI_SOFT_RESET_MSK, 1));
> +	if (ret)
> +		return ret;
> +
> +	ret = __admv1013_spi_update_bits(st,
> ADMV1013_REG_SPI_CONTROL,
> +
> ADMV1013_SPI_SOFT_RESET_MSK,
> +
> FIELD_PREP(ADMV1013_SPI_SOFT_RESET_MSK, 0));
> +	if (ret)
> +		return ret;
> +
> +	ret = __admv1013_spi_read(st,
> ADMV1013_REG_SPI_CONTROL, &chip_id);
> +	if (ret)
> +		return ret;
> +
> +	chip_id = FIELD_GET(ADMV1013_CHIP_ID_MSK, chip_id);
> +	if (chip_id != ADMV1013_CHIP_ID) {
> +		dev_err(&spi->dev, "Invalid Chip ID.\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = __admv1013_spi_write(st,
> ADMV1013_REG_VVA_TEMP_COMP, 0xE700);
> +	if (ret)
> +		return ret;
> +
> +	ret = __admv1013_spi_update_bits(st,
> ADMV1013_REG_QUAD,
> +
> ADMV1013_QUAD_SE_MODE_MSK,
> +
> FIELD_PREP(ADMV1013_QUAD_SE_MODE_MSK, st-
> >quad_se_mode));
> +	if (ret)
> +		return ret;
> +
> +	ret = admv1013_update_mixer_vgate(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = admv1013_update_quad_filters(st);
> +	if (ret)
> +		return ret;
> +
> +	enable_reg_msk = ADMV1013_VGA_PD_MSK |
> +			ADMV1013_MIXER_PD_MSK |
> +			ADMV1013_QUAD_PD_MSK |
> +			ADMV1013_BG_PD_MSK |
> +			ADMV1013_MIXER_IF_EN_MSK |
> +			ADMV1013_DET_EN_MSK;
> +
> +	enable_reg = FIELD_PREP(ADMV1013_VGA_PD_MSK, st-
> >vga_pd) |
> +			FIELD_PREP(ADMV1013_MIXER_PD_MSK, st-
> >mixer_pd) |
> +			FIELD_PREP(ADMV1013_QUAD_PD_MSK, st-
> >quad_pd ? 7 : 0) |
> +			FIELD_PREP(ADMV1013_BG_PD_MSK, st-
> >bg_pd) |
> +			FIELD_PREP(ADMV1013_MIXER_IF_EN_MSK,
> st->mixer_if_en) |
> +			FIELD_PREP(ADMV1013_DET_EN_MSK, st-
> >det_en);
> +
> +	return __admv1013_spi_update_bits(st,
> ADMV1013_REG_ENABLE, enable_reg_msk, enable_reg);
> +}
> +
> +static void admv1013_clk_disable(void *data)
> +{
> +	clk_disable_unprepare(data);
> +}
> +
> +static void admv1013_reg_disable(void *data)
> +{
> +	regulator_disable(data);
> +}
> +
> +static void admv1013_powerdown(void *data)
> +{
> +	unsigned int enable_reg, enable_reg_msk;
> +
> +	/* Disable all components in the Enable Register */
> +	enable_reg_msk = ADMV1013_VGA_PD_MSK |
> +			ADMV1013_MIXER_PD_MSK |
> +			ADMV1013_QUAD_PD_MSK |
> +			ADMV1013_BG_PD_MSK |
> +			ADMV1013_MIXER_IF_EN_MSK |
> +			ADMV1013_DET_EN_MSK;
> +
> +	enable_reg = FIELD_PREP(ADMV1013_VGA_PD_MSK, 1) |
> +			FIELD_PREP(ADMV1013_MIXER_PD_MSK, 1) |
> +			FIELD_PREP(ADMV1013_QUAD_PD_MSK, 7) |
> +			FIELD_PREP(ADMV1013_BG_PD_MSK, 1) |
> +			FIELD_PREP(ADMV1013_MIXER_IF_EN_MSK,
> 0) |
> +			FIELD_PREP(ADMV1013_DET_EN_MSK, 0);
> +
> +	admv1013_spi_update_bits(data, ADMV1013_REG_ENABLE,
> enable_reg_msk, enable_reg);
> +}
> +
> +static int admv1013_properties_parse(struct admv1013_state *st)
> +{
> +	int ret;
> +	struct spi_device *spi = st->spi;
> +
> +	st->vga_pd = device_property_read_bool(&spi->dev, "adi,vga-
> pd");
> +	st->mixer_pd = device_property_read_bool(&spi->dev,
> "adi,mixer-pd");
> +	st->quad_pd = device_property_read_bool(&spi->dev,
> "adi,quad-pd");
> +	st->bg_pd = device_property_read_bool(&spi->dev, "adi,bg-
> pd");
> +	st->mixer_if_en = device_property_read_bool(&spi->dev,
> "adi,mixer-if-en");
> +	st->det_en = device_property_read_bool(&spi->dev, "adi,det-
> en");
> +
> +	ret = device_property_read_u32(&spi->dev, "adi,quad-se-
> mode", &st->quad_se_mode);
> +	if (ret)
> +		st->quad_se_mode = 12;
> +
> +	st->reg = devm_regulator_get(&spi->dev, "vcm");
> +	if (IS_ERR(st->reg))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->reg),
> +				     "failed to get the common-mode
> voltage\n");
> +
> +	st->clkin = devm_clk_get(&spi->dev, "lo_in");
> +	if (IS_ERR(st->clkin))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
> +				     "failed to get the LO input clock\n");
> +
> +	return 0;
> +}
> +
> +static int admv1013_probe(struct spi_device *spi)
> +{
> +	struct iio_dev *indio_dev;
> +	struct admv1013_state *st;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	st = iio_priv(indio_dev);
> +
> +	indio_dev->dev.parent = &spi->dev;

not needed anymore...

> +	indio_dev->info = &admv1013_info;
> +	indio_dev->name = "admv1013";
> +	indio_dev->channels = admv1013_channels;
> +	indio_dev->num_channels =
> ARRAY_SIZE(admv1013_channels);
> +
> +	st->spi = spi;
> +
> +	ret = admv1013_properties_parse(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = regulator_enable(st->reg);
> +	if (ret) {
> +		dev_err(&spi->dev, "Failed to enable specified
> Common-Mode Voltage!\n");
> +		return ret;
> +	}
> +
> +	ret = devm_add_action_or_reset(&spi->dev,
> admv1013_reg_disable,
> +				       st->reg);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(st->clkin);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action_or_reset(&spi->dev,
> admv1013_clk_disable, st->clkin);
> +	if (ret)
> +		return ret;
> +
> +	st->nb.notifier_call = admv1013_freq_change;
> +	ret = clk_notifier_register(st->clkin, &st->nb);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action_or_reset(&spi->dev,
> admv1013_clk_notifier_unreg, st);
> +	if (ret)
> +		return ret;
> +
> +	mutex_init(&st->lock);
> +
> +	ret = admv1013_init(st);
> +	if (ret) {
> +		dev_err(&spi->dev, "admv1013 init failed\n");
> +		return ret;
> +	}
> +
> +	ret = devm_add_action_or_reset(&spi->dev,
> admv1013_powerdown, st);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(&spi->dev, indio_dev);
> +}
> +
> +static const struct spi_device_id admv1013_id[] = {
> +	{ "admv1013", 0},
> +	{}
> +};
> +MODULE_DEVICE_TABLE(spi, admv1013_id);
> +
> +static const struct of_device_id admv1013_of_match[] = {
> +	{ .compatible = "adi,admv1013" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, admv1013_of_match);
> +
> +static struct spi_driver admv1013_driver = {
> +	.driver = {
> +		.name = "admv1013",
> +		.of_match_table = admv1013_of_match,
> +	},
> +	.probe = admv1013_probe,
> +	.id_table = admv1013_id,
> +};
> +module_spi_driver(admv1013_driver);
> +
> +MODULE_AUTHOR("Antoniu Miclaus
> <antoniu.miclaus@analog.com");
> +MODULE_DESCRIPTION("Analog Devices ADMV1013");
> +MODULE_LICENSE("GPL v2");
> --
> 2.33.1