Hello,
It looks like the basic SPI I/O function, spi_xfer() has two different prototypes in U-boot.
1. in common/soft_spi.c, include/spi.h and cpu/nio/spi.c it is declared as
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar *dout, uchar *din)
2. in SPI drivers for MPC CPUs (cpu/mpc{8xx, 8260, 5xxx}/spi.c) it is declared as
ssize_t spi_xfer (size_t count)
The code for "sspi" command (do_spi()) definitely uses the first prototype. Subsequently it doesn't work on the above mentioned CPUs (unless you use software SPI implementation).
On the other hand, the code for the "eeprom" command, which is another way to access an SPI EEPROM uses functions spi_read() and spi_write, which are implemented only in cpu/mpc{8xx, 8260, 5xxx}/spi.c. However, these functions are very basic. Fore example they do not allow you to control SPI chip select.
Can someone tell me what is going on. Is it that MPC drivers became outdated and should be modified? How do other people use them then? Or I am simply missing something?
Thanks, Vladimir