Hello,
You can use the following code:
PCC->PCCn[PCC_PORTB_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clock for PORTB */
PORTB->PCR[25] |= PORT_PCR_MUX(5); /* Port B25: MUX = ALT5, LPSPI2_PSC0 */
PORTB->PCR[27] |= PORT_PCR_MUX(5); /* Port B27: MUX = ALT5, LPSPI2_SOUT */
PORTB->PCR[28] |= PORT_PCR_MUX(5); /* Port B28: MUX = ALT5, LPSPI2_SIN */
PORTB->PCR[29] |= PORT_PCR_MUX(5); /* Port B29: MUX = ALT5, LPSPI2_SCK */
Regards,
Daniel