The Bosch Sensortec BMA400 3-axes ultra-low power supports a 4 wire
SPI ditital interface. This patch adds support for the device when
configured for SPI instead of I2C.
I was originally hoping to avoid using a regmap_bus definition, but the
register reads from the device are padded by a byte while register
writes are not padded. As a result, a regmap_config like the following
does not work.
const struct regmap_config bma400_regmap_spi_config = {
reg_bits = 8,
pad_bits = 8,
val_bits = 8,
read_flag_mask = BIT(7),
max_register = BMA400_CMD_REG,
};
I used a regmap_bus structure with read and write implementations to
work around this, but would appreciate feedback on this approach and
my implementation.
Cheers,
- Dan
Dan Robertson (1):
iio: accel: bma400: add support for bma400 spi
drivers/iio/accel/Kconfig | 8 ++-
drivers/iio/accel/Makefile | 1 +
drivers/iio/accel/bma400_spi.c | 126 +++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+), 1 deletion(-)
create mode 100644 drivers/iio/accel/bma400_spi.c
