On Wed, 27 Mar 2024 22:03:20 +0000
Lothar Rubusch <l.rubusch@xxxxxxxxx> wrote:
> Add a setup function implementation to the spi module to enable spi-3wire
> as option when specified in the device-tree.
>
> Signed-off-by: Lothar Rubusch <l.rubusch@xxxxxxxxx>
> ---
> drivers/iio/accel/adxl345.h | 2 ++
> drivers/iio/accel/adxl345_spi.c | 12 +++++++++++-
> 2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
> index 4ea9341d4..e6bc3591c 100644
> --- a/drivers/iio/accel/adxl345.h
> +++ b/drivers/iio/accel/adxl345.h
> @@ -30,6 +30,8 @@
> #define ADXL345_POWER_CTL_MEASURE BIT(3)
> #define ADXL345_POWER_CTL_STANDBY 0x00
>
> +#define ADXL345_DATA_FORMAT_SPI_3WIRE BIT(6) /* 3-wire SPI mode */
> +
> #define ADXL345_DATA_FORMAT_RANGE GENMASK(1, 0) /* Set the g range */
> #define ADXL345_DATA_FORMAT_JUSTIFY BIT(2) /* Left-justified (MSB) mode */
> #define ADXL345_DATA_FORMAT_FULL_RES BIT(3) /* Up to 13-bits resolution */
> diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
> index 1c0513bd3..f145d5c1d 100644
> --- a/drivers/iio/accel/adxl345_spi.c
> +++ b/drivers/iio/accel/adxl345_spi.c
> @@ -20,6 +20,16 @@ static const struct regmap_config adxl345_spi_regmap_config = {
> .read_flag_mask = BIT(7) | BIT(6),
> };
>
> +static int adxl345_spi_setup(struct device *dev, struct regmap *regmap)
> +{
> + struct spi_device *spi = container_of(dev, struct spi_device, dev);
> +
> + if (spi->mode & SPI_3WIRE)
> + return regmap_write(regmap, ADXL345_REG_DATA_FORMAT,
> + ADXL345_DATA_FORMAT_SPI_3WIRE);
Your earlier patch carefully (I think) left one or two fields alone, then
this write just comes in and changes them. In particular INT_INVERT.
If it doesn't makes sense to write it there, either write that bit
every time here, or leave it alone every time. Not decide on whether
to write the bit based on SPI_3WIRE or not. As far as I know they
are unconnected features.
> + return 0;
> +}
> +
> static int adxl345_spi_probe(struct spi_device *spi)
> {
> struct regmap *regmap;
> @@ -33,7 +43,7 @@ static int adxl345_spi_probe(struct spi_device *spi)
> if (IS_ERR(regmap))
> return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
>
> - return adxl345_core_probe(&spi->dev, regmap, NULL);
> + return adxl345_core_probe(&spi->dev, regmap, adxl345_spi_setup);
> }
>
> static const struct adxl345_chip_info adxl345_spi_info = {
