Allow dynamic configuration of the SPI word length. This is required for controllers and slaves that need to operate with non-standard word lengths, such as 9-bit wide transfers.
Signed-off-by: Dario Binacchi <[email protected]> --- drivers/spi/spi-uclass.c | 19 +++++++++++++++++++ include/spi.h | 12 ++++++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c index 49b584c648d6..a4a3b6c25b7d 100644 --- a/drivers/spi/spi-uclass.c +++ b/drivers/spi/spi-uclass.c @@ -91,6 +91,20 @@ void dm_spi_release_bus(struct udevice *dev) ops->release_bus(dev); } +int dm_spi_set_wordlen(struct udevice *dev, unsigned int wordlen) +{ + struct udevice *bus = dev->parent; + struct dm_spi_ops *ops = spi_get_ops(bus); + + if (bus->uclass->uc_drv->id != UCLASS_SPI) + return -EOPNOTSUPP; + + if (!ops->set_wordlen) + return -ENOSYS; + + return ops->set_wordlen(dev, wordlen); +} + int dm_spi_xfer(struct udevice *dev, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { @@ -144,6 +158,11 @@ int spi_set_speed(struct spi_slave *slave, uint hz) return ret; } +int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen) +{ + return dm_spi_set_wordlen(slave->dev, wordlen); +} + int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { diff --git a/include/spi.h b/include/spi.h index 2783200d663e..a92f54a7404b 100644 --- a/include/spi.h +++ b/include/spi.h @@ -729,6 +729,18 @@ int dm_spi_claim_bus(struct udevice *dev); */ void dm_spi_release_bus(struct udevice *dev); +/** + * Set the word length for SPI transactions + * + * Set the word length (number of bits per word) for SPI transactions. + * + * @slave: The SPI slave + * @wordlen: The number of bits in a word + * + * Returns: 0 on success, -1 on failure. + */ +int dm_spi_set_wordlen(struct udevice *dev, unsigned int wordlen); + /** * SPI transfer * -- 2.43.0
