spicommon_bus_initialize_io() function

SPI peripheral to be routed

Pointer to a spi_bus_config struct detailing the GPIO pins

Combination of SPICOMMON_BUSFLAG_* flags, set to ensure the pins set are capable with some functions: - ``SPICOMMON_BUSFLAG_MASTER``: Initialize I/O in master mode - ``SPICOMMON_BUSFLAG_SLAVE``: Initialize I/O in slave mode - ``SPICOMMON_BUSFLAG_IOMUX_PINS``: Pins set should match the iomux pins of the controller. - ``SPICOMMON_BUSFLAG_SCLK``, ``SPICOMMON_BUSFLAG_MISO``, ``SPICOMMON_BUSFLAG_MOSI``: Make sure SCLK/MISO/MOSI is/are set to a valid GPIO. Also check output capability according to the mode. - ``SPICOMMON_BUSFLAG_DUAL``: Make sure both MISO and MOSI are output capable so that DIO mode is capable. - ``SPICOMMON_BUSFLAG_WPHD`` Make sure WP and HD are set to valid output GPIOs. - ``SPICOMMON_BUSFLAG_QUAD``: Combination of ``SPICOMMON_BUSFLAG_DUAL`` and ``SPICOMMON_BUSFLAG_WPHD``. - ``SPICOMMON_BUSFLAG_IO4_IO7``: Make sure spi data4 ~ spi data7 are set to valid output GPIOs. - ``SPICOMMON_BUSFLAG_OCTAL``: Combination of ``SPICOMMON_BUSFLAG_QUAL`` and ``SPICOMMON_BUSFLAG_IO4_IO7``.

A SPICOMMON_BUSFLAG_* flag combination of bus abilities will be written to this address. Leave to NULL if not needed. - ``SPICOMMON_BUSFLAG_IOMUX_PINS``: The bus is connected to iomux pins. - ``SPICOMMON_BUSFLAG_SCLK``, ``SPICOMMON_BUSFLAG_MISO``, ``SPICOMMON_BUSFLAG_MOSI``: The bus has CLK/MISO/MOSI connected. - ``SPICOMMON_BUSFLAG_DUAL``: The bus is capable with DIO mode. - ``SPICOMMON_BUSFLAG_WPHD`` The bus has WP and HD connected. - ``SPICOMMON_BUSFLAG_QUAD``: Combination of ``SPICOMMON_BUSFLAG_DUAL`` and ``SPICOMMON_BUSFLAG_WPHD``. - ``SPICOMMON_BUSFLAG_IO4_IO7``: The bus has spi data4 ~ spi data7 connected. - ``SPICOMMON_BUSFLAG_OCTAL``: Combination of ``SPICOMMON_BUSFLAG_QUAL`` and ``SPICOMMON_BUSFLAG_IO4_IO7``.