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spi: add support for bits-per-word setting

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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 <dario.binacchi@amarulasolutions.com>
Reviewed-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Dario Binacchi 2026-02-25 17:16:52 +01:00 committed by Patrice Chotard
parent 5ab39c8a66
commit 7b879ddbc5
2 changed files with 35 additions and 1 deletions
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22
drivers/spi/spi-uclass.c
View File

@ -88,6 +88,20 @@ 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)
{
@ -141,6 +155,11 @@ 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)
{
@ -245,6 +264,7 @@ static int spi_child_post_bind(struct udevice *dev)
}
plat->mode = mode;
plat->wordlen = SPI_DEFAULT_WORDLEN;
return 0;
}
@ -277,7 +297,7 @@ static int spi_child_pre_probe(struct udevice *dev)
slave->max_hz = plat->max_hz;
slave->mode = plat->mode;
slave->wordlen = SPI_DEFAULT_WORDLEN;
slave->wordlen = plat->wordlen;
return 0;
}

14
include/spi.h
View File

@ -77,11 +77,13 @@ struct dm_spi_bus {
* @cs: Chip select number (0..n-1)
* @max_hz: Maximum bus speed that this slave can tolerate
* @mode: SPI mode to use for this device (see SPI mode flags)
* @wordlen: Word length in bits to use for this device
*/
struct dm_spi_slave_plat {
unsigned int cs[SPI_CS_CNT_MAX];
uint max_hz;
uint mode;
unsigned int wordlen;
};
/**
@ -718,6 +720,18 @@ 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
*