Message-ID: <CA+U=DsqYH8ghQRiGnQDq9xdf325K-g3tfitwBSQOhPFup35YTg@mail.gmail.com>
Date:   Mon, 2 Aug 2021 10:04:04 +0300
From:   Alexandru Ardelean <ardeleanalex@...il.com>
To:     Lucas Stankus <lucas.p.stankus@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Bogdan, Dragos" <Dragos.Bogdan@...log.com>,
        "Berghe, Darius" <Darius.Berghe@...log.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] iio: accel: Add driver support for ADXL313

On Sat, Jul 31, 2021 at 11:37 PM Lucas Stankus
<lucas.p.stankus@...il.com> wrote:
>
> ADXL313 is a small, thin, low power, 3-axis accelerometer with high
> resolution measurement up to +/-4g. It includes an integrated 32-level
> FIFO and has activity and inactivity sensing capabilities.
>

I have just one small note to add on top of what Jonathan said, about
the null terminator.
Since this may be getting a V2, I thought it could go in.

> Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
>
> Signed-off-by: Lucas Stankus <lucas.p.stankus@...il.com>
> ---
>  MAINTAINERS                      |   9 +
>  drivers/iio/accel/Kconfig        |  29 +++
>  drivers/iio/accel/Makefile       |   3 +
>  drivers/iio/accel/adxl313.h      |  60 ++++++
>  drivers/iio/accel/adxl313_core.c | 323 +++++++++++++++++++++++++++++++
>  drivers/iio/accel/adxl313_i2c.c  |  65 +++++++
>  drivers/iio/accel/adxl313_spi.c  |  74 +++++++
>  7 files changed, 563 insertions(+)
>  create mode 100644 drivers/iio/accel/adxl313.h
>  create mode 100644 drivers/iio/accel/adxl313_core.c
>  create mode 100644 drivers/iio/accel/adxl313_i2c.c
>  create mode 100644 drivers/iio/accel/adxl313_spi.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a61f4f3b78a9..1fc88723e632 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -585,6 +585,15 @@ L: platform-driver-x86@...r.kernel.org
>  S:     Maintained
>  F:     drivers/platform/x86/adv_swbutton.c
>
> +ADXL313 THREE-AXIS DIGITAL ACCELEROMETER DRIVER
> +M:     Lucas Stankus <lucas.p.stankus@...il.com>
> +S:     Supported
> +F:     Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml
> +F:     drivers/iio/accel/adxl313.h
> +F:     drivers/iio/accel/adxl313_core.c
> +F:     drivers/iio/accel/adxl313_i2c.c
> +F:     drivers/iio/accel/adxl313_spi.c
> +
>  ADXL34X THREE-AXIS DIGITAL ACCELEROMETER DRIVER (ADXL345/ADXL346)
>  M:     Michael Hennerich <michael.hennerich@...log.com>
>  S:     Supported
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 0e56ace61103..ae621532e716 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -30,6 +30,35 @@ config ADIS16209
>           To compile this driver as a module, say M here: the module will be
>           called adis16209.
>
> +config ADXL313
> +       tristate
> +
> +config ADXL313_I2C
> +       tristate "Analog Devices ADXL313 3-Axis Digital Accelerometer I2C Driver"
> +       depends on I2C
> +       select ADXL313
> +       select REGMAP_I2C
> +       help
> +         Say Y here if you want to build i2c support for the Analog Devices
> +         ADXL313 3-axis digital accelerometer.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called adxl313_i2c and you will also get adxl313_core
> +         for the core module.
> +
> +config ADXL313_SPI
> +       tristate "Analog Devices ADXL313 3-Axis Digital Accelerometer SPI Driver"
> +       depends on SPI
> +       select ADXL313
> +       select REGMAP_SPI
> +       help
> +         Say Y here if you want to build spi support for the Analog Devices
> +         ADXL313 3-axis digital accelerometer.
> +
> +         To compile this driver as a module, choose M here: the module
> +         will be called adxl313_spi and you will also get adxl313_core
> +         for the core module.
> +
>  config ADXL345
>         tristate
>
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 89280e823bcd..fadc92816e24 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -6,6 +6,9 @@
>  # When adding new entries keep the list in alphabetical order
>  obj-$(CONFIG_ADIS16201) += adis16201.o
>  obj-$(CONFIG_ADIS16209) += adis16209.o
> +obj-$(CONFIG_ADXL313) += adxl313_core.o
> +obj-$(CONFIG_ADXL313_I2C) += adxl313_i2c.o
> +obj-$(CONFIG_ADXL313_SPI) += adxl313_spi.o
>  obj-$(CONFIG_ADXL345) += adxl345_core.o
>  obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o
>  obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o
> diff --git a/drivers/iio/accel/adxl313.h b/drivers/iio/accel/adxl313.h
> new file mode 100644
> index 000000000000..72f268e02a80
> --- /dev/null
> +++ b/drivers/iio/accel/adxl313.h
> @@ -0,0 +1,60 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * ADXL313 3-Axis Digital Accelerometer
> + *
> + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@...il.com>
> + */
> +
> +#ifndef _ADXL313_H_
> +#define _ADXL313_H_
> +
> +/* ADXL313 register definitions */
> +#define ADXL313_REG_DEVID0             0x00
> +#define ADXL313_REG_DEVID1             0x01
> +#define ADXL313_REG_PARTID             0x02
> +#define ADXL313_REG_XID                        0x04
> +#define ADXL313_REG_SOFT_RESET         0x18
> +#define ADXL313_REG_OFS_AXIS(index)    (0x1E + (index))
> +#define ADXL313_REG_THRESH_ACT         0x24
> +#define ADXL313_REG_ACT_INACT_CTL      0x27
> +#define ADXL313_REG_BW_RATE            0x2C
> +#define ADXL313_REG_POWER_CTL          0x2D
> +#define ADXL313_REG_INT_MAP            0x2F
> +#define ADXL313_REG_DATA_FORMAT                0x31
> +#define ADXL313_REG_DATAX              0x32
> +#define ADXL313_REG_DATAY              0x34
> +#define ADXL313_REG_DATAZ              0x36
> +#define ADXL313_REG_FIFO_CTL           0x38
> +#define ADXL313_REG_FIFO_STATUS                0x39
> +
> +#define ADXL313_DEVID0                 0xAD
> +#define ADXL313_DEVID1                 0x1D
> +#define ADXL313_PARTID                 0xCB
> +#define ADXL313_SOFT_RESET             0x52
> +
> +#define ADXL313_RATE_MSK               GENMASK(3, 0)
> +#define ADXL313_RATE_BASE              6
> +
> +#define ADXL313_POWER_CTL_MSK          GENMASK(3, 2)
> +#define ADXL313_MEASUREMENT_MODE       BIT(3)
> +
> +#define ADXL313_RANGE_MSK              GENMASK(1, 0)
> +#define ADXL313_RANGE_4G               3
> +
> +#define ADXL313_FULL_RES               BIT(3)
> +#define ADXL313_SPI_3WIRE              BIT(6)
> +#define ADXL313_I2C_DISABLE            BIT(6)
> +
> +/*
> + * Scale for any g range is given in datasheet as
> + * 1024 LSB/g = 0.0009765625 * 9.80665 = 0.009576806640625 m/s^2
> + */
> +#define ADXL313_NSCALE 9576806
> +
> +extern const struct regmap_access_table adxl313_readable_regs_table;
> +
> +extern const struct regmap_access_table adxl313_writable_regs_table;
> +
> +int adxl313_core_probe(struct device *dev, struct regmap *regmap,
> +                      const char *name);
> +#endif /* _ADXL313_H_ */
> diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
> new file mode 100644
> index 000000000000..76382ab4f0f4
> --- /dev/null
> +++ b/drivers/iio/accel/adxl313_core.c
> @@ -0,0 +1,323 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL313 3-Axis Digital Accelerometer
> + *
> + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@...il.com>
> + *
> + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/iio/iio.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "adxl313.h"
> +
> +const struct regmap_range adxl313_readable_reg_range[] = {
> +       regmap_reg_range(ADXL313_REG_DEVID0, ADXL313_REG_XID),
> +       regmap_reg_range(ADXL313_REG_SOFT_RESET, ADXL313_REG_SOFT_RESET),
> +       regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)),
> +       regmap_reg_range(ADXL313_REG_THRESH_ACT, ADXL313_REG_ACT_INACT_CTL),
> +       regmap_reg_range(ADXL313_REG_BW_RATE, ADXL313_REG_FIFO_STATUS)
> +};
> +
> +const struct regmap_access_table adxl313_readable_regs_table = {
> +       .yes_ranges = adxl313_readable_reg_range,
> +       .n_yes_ranges = ARRAY_SIZE(adxl313_readable_reg_range)
> +};
> +EXPORT_SYMBOL_GPL(adxl313_readable_regs_table);
> +
> +const struct regmap_range adxl313_writable_reg_range[] = {
> +       regmap_reg_range(ADXL313_REG_SOFT_RESET, ADXL313_REG_SOFT_RESET),
> +       regmap_reg_range(ADXL313_REG_OFS_AXIS(0), ADXL313_REG_OFS_AXIS(2)),
> +       regmap_reg_range(ADXL313_REG_THRESH_ACT, ADXL313_REG_ACT_INACT_CTL),
> +       regmap_reg_range(ADXL313_REG_BW_RATE, ADXL313_REG_INT_MAP),
> +       regmap_reg_range(ADXL313_REG_DATA_FORMAT, ADXL313_REG_DATA_FORMAT),
> +       regmap_reg_range(ADXL313_REG_FIFO_CTL, ADXL313_REG_FIFO_CTL)
> +};
> +
> +const struct regmap_access_table adxl313_writable_regs_table = {
> +       .yes_ranges = adxl313_writable_reg_range,
> +       .n_yes_ranges = ARRAY_SIZE(adxl313_writable_reg_range)
> +};
> +EXPORT_SYMBOL_GPL(adxl313_writable_regs_table);
> +
> +struct adxl313_data {
> +       struct regmap   *regmap;
> +       struct mutex    lock; /* lock to protect transf_buf */
> +       __le16          transf_buf ____cacheline_aligned;
> +};
> +
> +static const int adxl313_odr_freqs[][2] = {
> +       [0] = { 6, 250000 },
> +       [1] = { 12, 500000 },
> +       [2] = { 25, 0 },
> +       [3] = { 50, 0 },
> +       [4] = { 100, 0 },
> +       [5] = { 200, 0 },
> +       [6] = { 400, 0 },
> +       [7] = { 800, 0 },
> +       [8] = { 1600, 0 },
> +       [9] = { 3200, 0 },
> +};
> +
> +#define ADXL313_ACCEL_CHANNEL(index, addr, axis) {                     \
> +       .type = IIO_ACCEL,                                              \
> +       .address = addr,                                                \
> +       .modified = 1,                                                  \
> +       .channel2 = IIO_MOD_##axis,                                     \
> +       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |                  \
> +                             BIT(IIO_CHAN_INFO_CALIBBIAS),             \
> +       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |          \
> +                                   BIT(IIO_CHAN_INFO_SAMP_FREQ),       \
> +       .info_mask_shared_by_type_available =                           \
> +               BIT(IIO_CHAN_INFO_SAMP_FREQ),                           \
> +       .scan_index = index,                                            \
> +       .scan_type = {                                                  \
> +               .sign = 's',                                            \
> +               .realbits = 13,                                         \
> +               .storagebits = 16,                                      \
> +               .endianness = IIO_LE,                                   \
> +       },                                                              \
> +}
> +
> +static const struct iio_chan_spec adxl313_channels[] = {
> +       ADXL313_ACCEL_CHANNEL(0, ADXL313_REG_DATAX, X),
> +       ADXL313_ACCEL_CHANNEL(1, ADXL313_REG_DATAY, Y),
> +       ADXL313_ACCEL_CHANNEL(2, ADXL313_REG_DATAZ, Z),
> +};
> +
> +static int adxl313_set_odr(struct adxl313_data *data,
> +                          unsigned int freq1, unsigned int freq2)
> +{
> +       unsigned int i;
> +
> +       for (i = 0; i < ARRAY_SIZE(adxl313_odr_freqs); i++) {
> +               if (adxl313_odr_freqs[i][0] == freq1 &&
> +                   adxl313_odr_freqs[i][1] == freq2)
> +                       break;
> +       }
> +
> +       if (i == ARRAY_SIZE(adxl313_odr_freqs))
> +               return -EINVAL;
> +
> +       return regmap_update_bits(data->regmap, ADXL313_REG_BW_RATE,
> +                                 ADXL313_RATE_MSK,
> +                                 FIELD_PREP(ADXL313_RATE_MSK,
> +                                            ADXL313_RATE_BASE + i));
> +}
> +
> +static int adxl313_read_axis(struct adxl313_data *data,
> +                            struct iio_chan_spec const *chan)
> +{
> +       int ret;
> +
> +       mutex_lock(&data->lock);
> +
> +       ret = regmap_bulk_read(data->regmap,
> +                              chan->address,
> +                              &data->transf_buf, 2);
> +       if (ret)
> +               goto unlock_ret;
> +
> +       ret = le16_to_cpu(data->transf_buf);
> +
> +unlock_ret:
> +       mutex_unlock(&data->lock);
> +       return ret;
> +}
> +
> +static int adxl313_read_freq_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_SAMP_FREQ:
> +               *vals = (const int *)adxl313_odr_freqs;
> +               *length = ARRAY_SIZE(adxl313_odr_freqs) * 2;
> +               *type = IIO_VAL_INT_PLUS_MICRO;
> +               return IIO_AVAIL_LIST;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static int adxl313_read_raw(struct iio_dev *indio_dev,
> +                           struct iio_chan_spec const *chan,
> +                           int *val, int *val2, long mask)
> +{
> +       struct adxl313_data *data = iio_priv(indio_dev);
> +       unsigned int regval;
> +       int ret;
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_RAW:
> +               ret = adxl313_read_axis(data, chan);
> +               if (ret < 0)
> +                       return ret;
> +
> +               *val = sign_extend32(ret, chan->scan_type.realbits - 1);
> +               return IIO_VAL_INT;
> +       case IIO_CHAN_INFO_SCALE:
> +               *val = 0;
> +               *val2 = ADXL313_NSCALE;
> +               return IIO_VAL_INT_PLUS_NANO;
> +       case IIO_CHAN_INFO_CALIBBIAS:
> +               ret = regmap_read(data->regmap,
> +                                 ADXL313_REG_OFS_AXIS(chan->scan_index),
> +                                 &regval);
> +               if (ret)
> +                       return ret;
> +
> +               /*
> +                * 8-bit resolution at +/- 0.5g, that is 4x accel data scale
> +                * factor at full resolution
> +                */
> +               *val = sign_extend32(regval, 7) * 4;
> +               return IIO_VAL_INT;
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               ret = regmap_read(data->regmap, ADXL313_REG_BW_RATE, &regval);
> +               if (ret)
> +                       return ret;
> +
> +               ret = FIELD_GET(ADXL313_RATE_MSK, regval) - ADXL313_RATE_BASE;
> +               *val = adxl313_odr_freqs[ret][0];
> +               *val2 = adxl313_odr_freqs[ret][1];
> +               return IIO_VAL_INT_PLUS_MICRO;
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static int adxl313_write_raw(struct iio_dev *indio_dev,
> +                            struct iio_chan_spec const *chan,
> +                            int val, int val2, long mask)
> +{
> +       struct adxl313_data *data = iio_priv(indio_dev);
> +
> +       switch (mask) {
> +       case IIO_CHAN_INFO_CALIBBIAS:
> +               /*
> +                * 8-bit resolution at +/- 0.5g, that is 4x accel data scale
> +                * factor at full resolution
> +                */
> +               if (val > 127 * 4 || val < -128 * 4)
> +                       return -EINVAL;
> +
> +               return regmap_write(data->regmap,
> +                                   ADXL313_REG_OFS_AXIS(chan->scan_index),
> +                                   val / 4);
> +       case IIO_CHAN_INFO_SAMP_FREQ:
> +               return adxl313_set_odr(data, val, val2);
> +       }
> +
> +       return -EINVAL;
> +}
> +
> +static const struct iio_info adxl313_info = {
> +       .read_raw       = adxl313_read_raw,
> +       .write_raw      = adxl313_write_raw,
> +       .read_avail     = adxl313_read_freq_avail
> +};
> +
> +static int adxl313_setup(struct device *dev, struct adxl313_data *data)
> +{
> +       unsigned int regval;
> +       int ret;
> +
> +       /* Ensures the device is in a consistent state after start up */
> +       ret = regmap_write(data->regmap, ADXL313_REG_SOFT_RESET,
> +                          ADXL313_SOFT_RESET);
> +       if (ret)
> +               return ret;
> +
> +       if (device_property_read_bool(dev, "spi-3wire")) {
> +               ret = regmap_write(data->regmap, ADXL313_REG_DATA_FORMAT,
> +                                  ADXL313_SPI_3WIRE);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       ret = regmap_read(data->regmap, ADXL313_REG_DEVID0, &regval);
> +       if (ret)
> +               return ret;
> +
> +       if (regval != ADXL313_DEVID0) {
> +               dev_err(dev, "Invalid manufacturer ID: 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       ret = regmap_read(data->regmap, ADXL313_REG_DEVID1, &regval);
> +       if (ret)
> +               return ret;
> +
> +       if (regval != ADXL313_DEVID1) {
> +               dev_err(dev, "Invalid mems ID: 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       ret = regmap_read(data->regmap, ADXL313_REG_PARTID, &regval);
> +       if (ret)
> +               return ret;
> +
> +       if (regval != ADXL313_PARTID) {
> +               dev_err(dev, "Invalid device ID: 0x%02x\n", regval);
> +               return -ENODEV;
> +       }
> +
> +       /* Sets the range to +/- 4g */
> +       ret = regmap_update_bits(data->regmap, ADXL313_REG_DATA_FORMAT,
> +                                ADXL313_RANGE_MSK,
> +                                FIELD_PREP(ADXL313_RANGE_MSK,
> +                                           ADXL313_RANGE_4G));
> +       if (ret)
> +               return ret;
> +
> +       /* Enables full resolution */
> +       ret = regmap_update_bits(data->regmap, ADXL313_REG_DATA_FORMAT,
> +                                ADXL313_FULL_RES, ADXL313_FULL_RES);
> +       if (ret)
> +               return ret;
> +
> +       /* Enables measurement mode */
> +       return regmap_update_bits(data->regmap, ADXL313_REG_POWER_CTL,
> +                                 ADXL313_POWER_CTL_MSK,
> +                                 ADXL313_MEASUREMENT_MODE);
> +}
> +
> +int adxl313_core_probe(struct device *dev, struct regmap *regmap,
> +                      const char *name)
> +{
> +       struct adxl313_data *data;
> +       struct iio_dev *indio_dev;
> +       int ret;
> +
> +       indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> +       if (!indio_dev)
> +               return -ENOMEM;
> +
> +       data = iio_priv(indio_dev);
> +       data->regmap = regmap;
> +       mutex_init(&data->lock);
> +
> +       indio_dev->name = name;
> +       indio_dev->info = &adxl313_info;
> +       indio_dev->modes = INDIO_DIRECT_MODE;
> +       indio_dev->channels = adxl313_channels;
> +       indio_dev->num_channels = ARRAY_SIZE(adxl313_channels);
> +
> +       ret = adxl313_setup(dev, data);
> +       if (ret) {
> +               dev_err(dev, "ADXL313 setup failed\n");
> +               return ret;
> +       }
> +
> +       return devm_iio_device_register(dev, indio_dev);
> +}
> +EXPORT_SYMBOL_GPL(adxl313_core_probe);
> +
> +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@...il.com>");
> +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer core driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/adxl313_i2c.c b/drivers/iio/accel/adxl313_i2c.c
> new file mode 100644
> index 000000000000..65050a2fbd38
> --- /dev/null
> +++ b/drivers/iio/accel/adxl313_i2c.c
> @@ -0,0 +1,65 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL313 3-Axis Digital Accelerometer
> + *
> + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@...il.com>
> + *
> + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include "adxl313.h"
> +
> +static const struct regmap_config adxl313_i2c_regmap_config = {
> +       .reg_bits       = 8,
> +       .val_bits       = 8,
> +       .rd_table       = &adxl313_readable_regs_table,
> +       .wr_table       = &adxl313_writable_regs_table,
> +       .max_register   = 0x39
> +};
> +
> +static int adxl313_i2c_probe(struct i2c_client *client)
> +{
> +       struct regmap *regmap;
> +
> +       regmap = devm_regmap_init_i2c(client, &adxl313_i2c_regmap_config);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&client->dev, "Error initializing i2c regmap: %ld\n",
> +                       PTR_ERR(regmap));
> +               return PTR_ERR(regmap);
> +       }
> +
> +       return adxl313_core_probe(&client->dev, regmap, client->name);
> +}
> +
> +static const struct i2c_device_id adxl313_i2c_id[] = {
> +       { "adxl313", 0 },
> +       { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, adxl313_i2c_id);
> +
> +static const struct of_device_id adxl313_of_match[] = {
> +       { .compatible = "adi,adxl313" },
> +       { },

Since this may be getting a V2 anyway, maybe remove the comma from the
null-terminators [where the case].

> +};
> +
> +MODULE_DEVICE_TABLE(of, adxl313_of_match);
> +
> +static struct i2c_driver adxl313_i2c_driver = {
> +       .driver = {
> +               .name   = "adxl313_i2c",
> +               .of_match_table = adxl313_of_match,
> +       },
> +       .probe_new      = adxl313_i2c_probe,
> +       .id_table       = adxl313_i2c_id,
> +};
> +
> +module_i2c_driver(adxl313_i2c_driver);
> +
> +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@...il.com>");
> +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer I2C driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/iio/accel/adxl313_spi.c b/drivers/iio/accel/adxl313_spi.c
> new file mode 100644
> index 000000000000..7c58c9ff8985
> --- /dev/null
> +++ b/drivers/iio/accel/adxl313_spi.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * ADXL313 3-Axis Digital Accelerometer
> + *
> + * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@...il.com>
> + *
> + * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
> + */
> +
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +
> +#include "adxl313.h"
> +
> +static const struct regmap_config adxl313_spi_regmap_config = {
> +       .reg_bits       = 8,
> +       .val_bits       = 8,
> +       .rd_table       = &adxl313_readable_regs_table,
> +       .wr_table       = &adxl313_writable_regs_table,
> +       .max_register   = 0x39,
> +        /* Setting bits 7 and 6 enables multiple-byte read */
> +       .read_flag_mask = BIT(7) | BIT(6)
> +};
> +
> +static int adxl313_spi_probe(struct spi_device *spi)
> +{
> +       const struct spi_device_id *id = spi_get_device_id(spi);
> +       struct regmap *regmap;
> +       int ret;
> +
> +       regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
> +                       PTR_ERR(regmap));
> +               return PTR_ERR(regmap);
> +       }
> +
> +       ret = adxl313_core_probe(&spi->dev, regmap, id->name);
> +       if (ret < 0)
> +               return ret;
> +
> +       return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
> +                                 ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
> +}
> +
> +static const struct spi_device_id adxl313_spi_id[] = {
> +       { "adxl313", 0 },
> +       { }
> +};
> +
> +MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
> +
> +static const struct of_device_id adxl313_of_match[] = {
> +       { .compatible = "adi,adxl313" },
> +       { },
> +};
> +
> +MODULE_DEVICE_TABLE(of, adxl313_of_match);
> +
> +static struct spi_driver adxl313_spi_driver = {
> +       .driver = {
> +               .name   = "adxl313_spi",
> +               .of_match_table = adxl313_of_match,
> +       },
> +       .probe          = adxl313_spi_probe,
> +       .id_table       = adxl313_spi_id,
> +};
> +
> +module_spi_driver(adxl313_spi_driver);
> +
> +MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@...il.com>");
> +MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.32.0
>

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