On SPI device probe, the core will call spi_setup in spi_add_device
before the corresponding driver was probed. When this happens, the
bits_per_word member of the device is not yet set by the driver,
resulting in the default being set to 8 bits-per-word.
However some controllers do not support 8 bits-per-word at all, which
results in a failure when checking the bits-per-word validity.
In order to support these devices, skip the bits-per-word validity
check when it is not explicitly provided by drivers.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://lore.kernel.org/r/20220412122207.130181-1-paul.kocialkowski@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
return -EINVAL;
}
- if (!spi->bits_per_word)
+ if (!spi->bits_per_word) {
spi->bits_per_word = 8;
-
- status = __spi_validate_bits_per_word(spi->controller,
- spi->bits_per_word);
- if (status)
- return status;
+ } else {
+ /*
+ * Some controllers may not support the default 8 bits-per-word
+ * so only perform the check when this is explicitly provided.
+ */
+ status = __spi_validate_bits_per_word(spi->controller,
+ spi->bits_per_word);
+ if (status)
+ return status;
+ }
if (spi->controller->max_speed_hz &&
(!spi->max_speed_hz ||