我可以在用户空间修改regmap_config参数，比如regmap_config的.val_bits吗？

Question

我想知道是否可以从用户空间修改 regmap_config 参数，例如 .val_bits 字段。我知道内核驱动程序通常使用 regmap_config 结构来描述硬件特性，但我想知道是否有任何方法可以在运行时修改这些参数而无需重建内核模块。

static int my_device_reg_access(struct iio_dev *indio_dev, unsigned int reg,
                 unsigned int writeval, unsigned int *readval)
{
    struct my_device_state *st = iio_priv(indio_dev);

    if (readval)
        return regmap_read(st->regmap, reg, readval);

    else
        return regmap_write(st->regmap, reg, writeval);
}

static struct regmap_config my_device_regmap_config = {
    .reg_bits = 16,
    .val_bits = 16,
    .write_flag_mask = BIT(7),
    .max_register = 0x7FFF,
};

static const struct iio_info my_device_info = {
    .debugfs_reg_access = &my_device_reg_access,
};

static int my_device_probe(struct spi_device *spi)
{
    struct my_device_state *st;
    struct iio_dev *indio_dev;

    indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
    if (!indio_dev)
        return -ENOMEM;

    st = iio_priv(indio_dev);
    st->spi = spi;

    st->regmap = devm_regmap_init_spi(spi, &my_device_regmap_config);
    if (IS_ERR(st->regmap))
        return PTR_ERR(st->regmap);

    indio_dev->name = "my_device";
    indio_dev->info = &my_device_info;
    indio_dev->modes = INDIO_DIRECT_MODE;
    indio_dev->channels = NULL;

    mutex_init(&st->lock);

    return devm_iio_device_register(&spi->dev, indio_dev);
}

我期待用户可以在用户空间中输入其所需的val_bits参数值。