Hi all,
I am trying to use a tcan4550 together with a Raspberry PI 3 B. I am using the
tcan4x5x driver from net-next.
I always get the following error during startup.
tcan4x5x spi0.0: Probe failed, err=-22
tcan4x5x: probe of spi0.0 failed with error -22
I realized that this happens because the Raspberry PI does only support 8/9 bit
words. https://elinux.org/index.php?title=RPi_SPI#Supported_bits_per_word
In the driver it is set to 32.
spi->bits_per_word = 32;
Setting this to 8 does not help of course since the tcan chip expects a
multiple of 32 per spi transaction.
I don't know if this is a Raspberry Pi specific problem or if there are more
devices with this hardware limitation.
Does anyone have a workaround for that?
If this a common issue it might be a good idea to patch the driver. I will
check if I can find proper a way to do so.
Regards,
Konstantin
