On Mon, Mar 13, 2023 at 09:55:25AM +0000, Christophe Leroy wrote:
> Le 07/03/2023 à 23:16, Mark Brown a écrit :

> > So the CPU is big endian, memory has a big endian word in it and the
> > controller is then sending as little endian?  That would mean that the
> > driver for the controller is implementing SPI_LSB_FIRST mode without
> > being asked (IIRC there is an option to run these systems LE, I don't
> > know if the controller is just always little endian or always byte
> > swapping).  That seems like a bug in the driver for the controller.

> What does SPI_LSB_FIRST stands for ? From what you say, shall I 
> understand that it means Least Significant _Byte_ first ?

> I'm asking because as far as I can see, for the controller SPI_LSB_FIRST 
> means Least Significant _bit_ first. Is that wrong ?

Ah, you're right - it's bit rather than byte.