Yocto Layers: sp7021 Flexible Muxing

Is the feature that allow you to change functionality of ANY pin at the run-time. Flexible muxing is available for:

• both Eth interfaces and MDIO bus;
• SDIO, 8x PWMs, 4x ICMs, 4x SPI masters, 4x SPI Slaves, 4x I2C Masters;
• 4x UARTs;

Group Pin Muxing is available for:

• Audio, SPI Flash, EMMC, USBs;
• LCDIF, FPGA;

Linux Run-Time Mux

Curent mux information is available at:

# cat /sys/bus/platform/devices/9c000100.pctl/txt_map

Individual pin/group muxing may be done by running

# echo -e "\0xNN" > /sys/bus/platform/devices/9c000100.pctl/<func>

, where NN is hex pin number, func is the function.

Flexible mux driver supports bulk muxing and onboot firmware load.