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Date:   Thu, 21 Oct 2021 21:02:57 +0100
From:   Jonathan Cameron <jic23@kernel.org>
To:     Antoniu Miclaus <antoniu.miclaus@analog.com>
Cc:     <linux-kernel@vger.kernel.org>, <linux-iio@vger.kernel.org>
Subject: Re: [PATCH v9 1/2] iio: frequency: adrf6780: add support for
 ADRF6780
Message-ID: <20211021210257.746ba5dc@jic23-huawei>
In-Reply-To: <20211021113244.56936-1-antoniu.miclaus@analog.com>
References: <20211021113244.56936-1-antoniu.miclaus@analog.com>
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On Thu, 21 Oct 2021 14:32:43 +0300
Antoniu Miclaus <antoniu.miclaus@analog.com> wrote:

> The ADRF6780 is a silicon germanium (SiGe) design, wideband,
> microwave upconverter optimized for point to point microwave
> radio designs operating in the 5.9 GHz to 23.6 GHz frequency
> range.
> 
> Datasheet:
> https://www.analog.com/media/en/technical-documentation/data-sheets/ADRF6780.pdf
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Cutting it fine but hopefully we can sneak this one in before
the merge window as I'm about to push out for a final inclusion
in linux-next before sending a pull request.

Applied to the togreg branch of iio.git - I tweaked the line breaks
a little, choosing to relax the align with opening brackets in favour
of having sub 100 char lines,

Thanks,

Jonathan

> ---
> changes in v9:
> 	- add locked and unlocked versions for spi operations and use them
> 	  accordingly
> 	- rename `dev` -> `st`
> 	- rename `struct adrf6780_dev` -> `struct adrf6780_state`
>  drivers/iio/frequency/Kconfig    |  12 +
>  drivers/iio/frequency/Makefile   |   1 +
>  drivers/iio/frequency/adrf6780.c | 521 +++++++++++++++++++++++++++++++
>  3 files changed, 534 insertions(+)
>  create mode 100644 drivers/iio/frequency/adrf6780.c
> 
> diff --git a/drivers/iio/frequency/Kconfig b/drivers/iio/frequency/Kconfig
> index 240b81502512..2c9e0559e8a4 100644
> --- a/drivers/iio/frequency/Kconfig
> +++ b/drivers/iio/frequency/Kconfig
> @@ -49,5 +49,17 @@ config ADF4371
>  
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called adf4371.
> +
> +config ADRF6780
> +        tristate "Analog Devices ADRF6780 Microwave Upconverter"
> +        depends on SPI
> +        depends on COMMON_CLK
> +        help
> +          Say yes here to build support for Analog Devices ADRF6780
> +          5.9 GHz to 23.6 GHz, Wideband, Microwave Upconverter.
> +
> +          To compile this driver as a module, choose M here: the
> +          module will be called adrf6780.
> +
>  endmenu
>  endmenu
> diff --git a/drivers/iio/frequency/Makefile b/drivers/iio/frequency/Makefile
> index 518b1e50caef..ae3136c79202 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_ADRF6780) += adrf6780.o
> diff --git a/drivers/iio/frequency/adrf6780.c b/drivers/iio/frequency/adrf6780.c
> new file mode 100644
> index 000000000000..b3fb0521196b
> --- /dev/null
> +++ b/drivers/iio/frequency/adrf6780.c
> @@ -0,0 +1,521 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADRF6780 driver
> + *
> + * Copyright 2021 Analog Devices Inc.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/iio/iio.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/spi/spi.h>
> +
> +#include <asm/unaligned.h>
> +
> +/* ADRF6780 Register Map */
> +#define ADRF6780_REG_CONTROL			0x00
> +#define ADRF6780_REG_ALARM_READBACK		0x01
> +#define ADRF6780_REG_ALARM_MASKS		0x02
> +#define ADRF6780_REG_ENABLE			0x03
> +#define ADRF6780_REG_LINEARIZE			0x04
> +#define ADRF6780_REG_LO_PATH			0x05
> +#define ADRF6780_REG_ADC_CONTROL		0x06
> +#define ADRF6780_REG_ADC_OUTPUT			0x0C
> +
> +/* ADRF6780_REG_CONTROL Map */
> +#define ADRF6780_PARITY_EN_MSK			BIT(15)
> +#define ADRF6780_SOFT_RESET_MSK			BIT(14)
> +#define ADRF6780_CHIP_ID_MSK			GENMASK(11, 4)
> +#define ADRF6780_CHIP_ID			0xA
> +#define ADRF6780_CHIP_REVISION_MSK		GENMASK(3, 0)
> +
> +/* ADRF6780_REG_ALARM_READBACK Map */
> +#define ADRF6780_PARITY_ERROR_MSK		BIT(15)
> +#define ADRF6780_TOO_FEW_ERRORS_MSK		BIT(14)
> +#define ADRF6780_TOO_MANY_ERRORS_MSK		BIT(13)
> +#define ADRF6780_ADDRESS_RANGE_ERROR_MSK	BIT(12)
> +
> +/* ADRF6780_REG_ENABLE Map */
> +#define ADRF6780_VGA_BUFFER_EN_MSK		BIT(8)
> +#define ADRF6780_DETECTOR_EN_MSK		BIT(7)
> +#define ADRF6780_LO_BUFFER_EN_MSK		BIT(6)
> +#define ADRF6780_IF_MODE_EN_MSK			BIT(5)
> +#define ADRF6780_IQ_MODE_EN_MSK			BIT(4)
> +#define ADRF6780_LO_X2_EN_MSK			BIT(3)
> +#define ADRF6780_LO_PPF_EN_MSK			BIT(2)
> +#define ADRF6780_LO_EN_MSK			BIT(1)
> +#define ADRF6780_UC_BIAS_EN_MSK			BIT(0)
> +
> +/* ADRF6780_REG_LINEARIZE Map */
> +#define ADRF6780_RDAC_LINEARIZE_MSK		GENMASK(7, 0)
> +
> +/* ADRF6780_REG_LO_PATH Map */
> +#define ADRF6780_LO_SIDEBAND_MSK		BIT(10)
> +#define ADRF6780_Q_PATH_PHASE_ACCURACY_MSK	GENMASK(7, 4)
> +#define ADRF6780_I_PATH_PHASE_ACCURACY_MSK	GENMASK(3, 0)
> +
> +/* ADRF6780_REG_ADC_CONTROL Map */
> +#define ADRF6780_VDET_OUTPUT_SELECT_MSK		BIT(3)
> +#define ADRF6780_ADC_START_MSK			BIT(2)
> +#define ADRF6780_ADC_EN_MSK			BIT(1)
> +#define ADRF6780_ADC_CLOCK_EN_MSK		BIT(0)
> +
> +/* ADRF6780_REG_ADC_OUTPUT Map */
> +#define ADRF6780_ADC_STATUS_MSK			BIT(8)
> +#define ADRF6780_ADC_VALUE_MSK			GENMASK(7, 0)
> +
> +struct adrf6780_state {
> +	struct spi_device	*spi;
> +	struct clk		*clkin;
> +	/* Protect against concurrent accesses to the device */
> +	struct mutex		lock;
> +	bool			vga_buff_en;
> +	bool			lo_buff_en;
> +	bool			if_mode_en;
> +	bool			iq_mode_en;
> +	bool			lo_x2_en;
> +	bool			lo_ppf_en;
> +	bool			lo_en;
> +	bool			uc_bias_en;
> +	bool			lo_sideband;
> +	bool			vdet_out_en;
> +	u8			data[3] ____cacheline_aligned;
> +};
> +
> +static int __adrf6780_spi_read(struct adrf6780_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 adrf6780_spi_read(struct adrf6780_state *st, unsigned int reg,
> +			     unsigned int *val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = adrf6780_spi_read(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __adrf6780_spi_write(struct adrf6780_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 adrf6780_spi_write(struct adrf6780_state *st, unsigned int reg,
> +			      unsigned int val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = adrf6780_spi_write(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __adrf6780_spi_update_bits(struct adrf6780_state *st, unsigned int reg,
> +				      unsigned int mask, unsigned int val)
> +{
> +	int ret;
> +	unsigned int data, temp;
> +
> +	ret = __adrf6780_spi_read(st, reg, &data);
> +	if (ret)
> +		return ret;
> +
> +	temp = (data & ~mask) | (val & mask);
> +
> +	return __adrf6780_spi_write(st, reg, temp);
> +}
> +
> +static int adrf6780_spi_update_bits(struct adrf6780_state *st, unsigned int reg,
> +				    unsigned int mask, unsigned int val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __adrf6780_spi_update_bits(st, reg, mask, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int adrf6780_read_adc_raw(struct adrf6780_state *st, unsigned int *read_val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
> +					 ADRF6780_ADC_EN_MSK |
> +					 ADRF6780_ADC_CLOCK_EN_MSK |
> +					 ADRF6780_ADC_START_MSK,
> +					 FIELD_PREP(ADRF6780_ADC_EN_MSK, 1) |
> +					 FIELD_PREP(ADRF6780_ADC_CLOCK_EN_MSK, 1) |
> +					 FIELD_PREP(ADRF6780_ADC_START_MSK, 1));
> +	if (ret)
> +		goto exit;
> +
> +	/* Recommended delay for the ADC to be ready*/
> +	usleep_range(200, 250);
> +
> +	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
> +	if (ret)
> +		goto exit;
> +
> +	if (!(*read_val & ADRF6780_ADC_STATUS_MSK)) {
> +		ret = -EINVAL;
> +		goto exit;
> +	}
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
> +					 ADRF6780_ADC_START_MSK,
> +					 FIELD_PREP(ADRF6780_ADC_START_MSK, 0));
> +	if (ret)
> +		goto exit;
> +
> +	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
> +
> +exit:
> +	mutex_unlock(&st->lock);
> +	return ret;
> +}
> +
> +static int adrf6780_read_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int *val, int *val2, long info)
> +{
> +	struct adrf6780_state *dev = iio_priv(indio_dev);
> +	unsigned int data;
> +	int ret;
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = adrf6780_read_adc_raw(dev, &data);
> +		if (ret)
> +			return ret;
> +
> +		*val = data & ADRF6780_ADC_VALUE_MSK;
> +
> +		return IIO_VAL_INT;
> +
> +	case IIO_CHAN_INFO_SCALE:
> +		ret = adrf6780_spi_read(dev, ADRF6780_REG_LINEARIZE, &data);
> +		if (ret)
> +			return ret;
> +
> +		*val = data & ADRF6780_RDAC_LINEARIZE_MSK;
> +
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_PHASE:
> +		ret = adrf6780_spi_read(dev, ADRF6780_REG_LO_PATH, &data);
> +		if (ret)
> +			return ret;
> +
> +		switch (chan->channel2) {
> +		case IIO_MOD_I:
> +			*val = data & ADRF6780_I_PATH_PHASE_ACCURACY_MSK;
> +
> +			return IIO_VAL_INT;
> +		case IIO_MOD_Q:
> +			*val = FIELD_GET(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, data);
> +
> +			return IIO_VAL_INT;
> +		default:
> +			return -EINVAL;
> +		}
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int adrf6780_write_raw(struct iio_dev *indio_dev,
> +			      struct iio_chan_spec const *chan,
> +			      int val, int val2, long info)
> +{
> +	struct adrf6780_state *st = iio_priv(indio_dev);
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_SCALE:
> +		return adrf6780_spi_write(st, ADRF6780_REG_LINEARIZE, val);
> +	case IIO_CHAN_INFO_PHASE:
> +		switch (chan->channel2) {
> +		case IIO_MOD_I:
> +			return adrf6780_spi_update_bits(st, ADRF6780_REG_LO_PATH,
> +							ADRF6780_I_PATH_PHASE_ACCURACY_MSK,
> +							FIELD_PREP(ADRF6780_I_PATH_PHASE_ACCURACY_MSK, val));
> +		case IIO_MOD_Q:
> +			return adrf6780_spi_update_bits(st, ADRF6780_REG_LO_PATH,
> +							ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
> +							FIELD_PREP(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, val));
> +		default:
> +			return -EINVAL;
> +		}
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int adrf6780_reg_access(struct iio_dev *indio_dev,
> +			       unsigned int reg,
> +			       unsigned int write_val,
> +			       unsigned int *read_val)
> +{
> +	struct adrf6780_state *st = iio_priv(indio_dev);
> +
> +	if (read_val)
> +		return adrf6780_spi_read(st, reg, read_val);
> +	else
> +		return adrf6780_spi_write(st, reg, write_val);
> +}
> +
> +static const struct iio_info adrf6780_info = {
> +	.read_raw = adrf6780_read_raw,
> +	.write_raw = adrf6780_write_raw,
> +	.debugfs_reg_access = &adrf6780_reg_access,
> +};
> +
> +#define ADRF6780_CHAN_ADC(_channel) {			\
> +	.type = IIO_ALTVOLTAGE,				\
> +	.output = 0,					\
> +	.indexed = 1,					\
> +	.channel = _channel,				\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW)	\
> +}
> +
> +#define ADRF6780_CHAN_RDAC(_channel) {			\
> +	.type = IIO_ALTVOLTAGE,				\
> +	.output = 1,					\
> +	.indexed = 1,					\
> +	.channel = _channel,				\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_SCALE)	\
> +}
> +
> +#define ADRF6780_CHAN_IQ_PHASE(_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)		\
> +}
> +
> +static const struct iio_chan_spec adrf6780_channels[] = {
> +	ADRF6780_CHAN_ADC(0),
> +	ADRF6780_CHAN_RDAC(0),
> +	ADRF6780_CHAN_IQ_PHASE(0, I),
> +	ADRF6780_CHAN_IQ_PHASE(0, Q),
> +};
> +
> +static int adrf6780_reset(struct adrf6780_state *st)
> +{
> +	int ret;
> +	struct spi_device *spi = st->spi;
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
> +					 ADRF6780_SOFT_RESET_MSK,
> +					 FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 1));
> +	if (ret) {
> +		dev_err(&spi->dev, "ADRF6780 SPI software reset failed.\n");
> +		return ret;
> +	}
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
> +					 ADRF6780_SOFT_RESET_MSK,
> +					 FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 0));
> +	if (ret) {
> +		dev_err(&spi->dev, "ADRF6780 SPI software reset disable failed.\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int adrf6780_init(struct adrf6780_state *st)
> +{
> +	int ret;
> +	unsigned int chip_id, enable_reg, enable_reg_msk;
> +	struct spi_device *spi = st->spi;
> +
> +	/* Perform a software reset */
> +	ret = adrf6780_reset(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = __adrf6780_spi_read(st, ADRF6780_REG_CONTROL, &chip_id);
> +	if (ret)
> +		return ret;
> +
> +	chip_id = FIELD_GET(ADRF6780_CHIP_ID_MSK, chip_id);
> +	if (chip_id != ADRF6780_CHIP_ID) {
> +		dev_err(&spi->dev, "ADRF6780 Invalid Chip ID.\n");
> +		return -EINVAL;
> +	}
> +
> +	enable_reg_msk = ADRF6780_VGA_BUFFER_EN_MSK |
> +			ADRF6780_DETECTOR_EN_MSK |
> +			ADRF6780_LO_BUFFER_EN_MSK |
> +			ADRF6780_IF_MODE_EN_MSK |
> +			ADRF6780_IQ_MODE_EN_MSK |
> +			ADRF6780_LO_X2_EN_MSK |
> +			ADRF6780_LO_PPF_EN_MSK |
> +			ADRF6780_LO_EN_MSK |
> +			ADRF6780_UC_BIAS_EN_MSK;
> +
> +	enable_reg = FIELD_PREP(ADRF6780_VGA_BUFFER_EN_MSK, st->vga_buff_en) |
> +			FIELD_PREP(ADRF6780_DETECTOR_EN_MSK, 1) |
> +			FIELD_PREP(ADRF6780_LO_BUFFER_EN_MSK, st->lo_buff_en) |
> +			FIELD_PREP(ADRF6780_IF_MODE_EN_MSK, st->if_mode_en) |
> +			FIELD_PREP(ADRF6780_IQ_MODE_EN_MSK, st->iq_mode_en) |
> +			FIELD_PREP(ADRF6780_LO_X2_EN_MSK, st->lo_x2_en) |
> +			FIELD_PREP(ADRF6780_LO_PPF_EN_MSK, st->lo_ppf_en) |
> +			FIELD_PREP(ADRF6780_LO_EN_MSK, st->lo_en) |
> +			FIELD_PREP(ADRF6780_UC_BIAS_EN_MSK, st->uc_bias_en);
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ENABLE, enable_reg_msk, enable_reg);
> +	if (ret)
> +		return ret;
> +
> +	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_LO_PATH,
> +					 ADRF6780_LO_SIDEBAND_MSK,
> +					 FIELD_PREP(ADRF6780_LO_SIDEBAND_MSK, st->lo_sideband));
> +	if (ret)
> +		return ret;
> +
> +	return __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
> +					  ADRF6780_VDET_OUTPUT_SELECT_MSK,
> +					  FIELD_PREP(ADRF6780_VDET_OUTPUT_SELECT_MSK, st->vdet_out_en));
> +}
> +
> +static void adrf6780_properties_parse(struct adrf6780_state *st)
> +{
> +	struct spi_device *spi = st->spi;
> +
> +	st->vga_buff_en = device_property_read_bool(&spi->dev, "adi,vga-buff-en");
> +	st->lo_buff_en = device_property_read_bool(&spi->dev, "adi,lo-buff-en");
> +	st->if_mode_en = device_property_read_bool(&spi->dev, "adi,if-mode-en");
> +	st->iq_mode_en = device_property_read_bool(&spi->dev, "adi,iq-mode-en");
> +	st->lo_x2_en = device_property_read_bool(&spi->dev, "adi,lo-x2-en");
> +	st->lo_ppf_en = device_property_read_bool(&spi->dev, "adi,lo-ppf-en");
> +	st->lo_en = device_property_read_bool(&spi->dev, "adi,lo-en");
> +	st->uc_bias_en = device_property_read_bool(&spi->dev, "adi,uc-bias-en");
> +	st->lo_sideband = device_property_read_bool(&spi->dev, "adi,lo-sideband");
> +	st->vdet_out_en = device_property_read_bool(&spi->dev, "adi,vdet-out-en");
> +}
> +
> +static void adrf6780_clk_disable(void *data)
> +{
> +	clk_disable_unprepare(data);
> +}
> +
> +static void adrf6780_powerdown(void *data)
> +{
> +	/* Disable all components in the Enable Register */
> +	adrf6780_spi_write(data, ADRF6780_REG_ENABLE, 0x0);
> +}
> +
> +static int adrf6780_probe(struct spi_device *spi)
> +{
> +	struct iio_dev *indio_dev;
> +	struct adrf6780_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->info = &adrf6780_info;
> +	indio_dev->name = "adrf6780";
> +	indio_dev->channels = adrf6780_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(adrf6780_channels);
> +
> +	st->spi = spi;
> +
> +	adrf6780_properties_parse(st);
> +
> +	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");
> +
> +	ret = clk_prepare_enable(st->clkin);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action_or_reset(&spi->dev, adrf6780_clk_disable, st->clkin);
> +	if (ret)
> +		return ret;
> +
> +	mutex_init(&st->lock);
> +
> +	ret = adrf6780_init(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_add_action_or_reset(&spi->dev, adrf6780_powerdown, st);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(&spi->dev, indio_dev);
> +}
> +
> +static const struct spi_device_id adrf6780_id[] = {
> +	{ "adrf6780", 0 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(spi, adrf6780_id);
> +
> +static const struct of_device_id adrf6780_of_match[] = {
> +	{ .compatible = "adi,adrf6780" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, adrf6780_of_match);
> +
> +static struct spi_driver adrf6780_driver = {
> +	.driver = {
> +		.name = "adrf6780",
> +		.of_match_table = adrf6780_of_match,
> +	},
> +	.probe = adrf6780_probe,
> +	.id_table = adrf6780_id,
> +};
> +module_spi_driver(adrf6780_driver);
> +
> +MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
> +MODULE_DESCRIPTION("Analog Devices ADRF6780");
> +MODULE_LICENSE("GPL v2");