I have a doubt concerning SPI driver, this is the situation:
-I need to control 3 SPI devices, one of the uses QSPI_PCS0 Pin and the other two devices use GPIO.
I understand I must use IO_IOCTL_SPI_SET_CS_CALLBACK in order to call a customized function and control Chip Select automatically.
Does this mean I must open 3 SPI drivers so that I can use a specific routine to control each chip select pin? or
How do I indicate which pin should the callback function activate/deactivate?
I already checked the SPI example but since it only used ONE spi device I don't know how to indicate which device should be active.