My particular display connects to the SPI bus #1 (PA15 is MOSI, PA16 is MISO, PA14 is CLK and PA13 is CS) and two additional pins at PA00 and PA03 for RST and DC. Please note that physical pin numbers are different from the pin names in the Linux kernel and the GPIO numbers that are mapped to those pins. See the expansion port table on this page for how they’re all mapped together.