In a linux-related thread
where the issue is related to only using the sport SECONDARY channel for codec connection due to desired overall pin assignments.
It has been pointed out that the SPORT will not work as desired when a TX or RX pin of the PRIMARY channel is individually assigned as GPIO-function.
At this time I realize that this limitation could apply to other SPORT pins (clock & frame strobe) as well.
So, if I only need one single clock, because the SPORT is used as master, I'd arbitrarily like to define either TFS or RFS resp. TXCLK or RXCLK as a GPIO, in order to utilize the chip utmost. Well, given the limitation as outlined about, I'm afraid that similar limitations occur related to these pins...