Touch sense controller interface
Looking at the TSC2046 data sheet http://www.farnell.com/datasheets/1847520.pdf
and the LPC2138 data sheet http://www.nxp.com/documents/data_sheet/LPC2131_32_34_36_38.pdf
it would seem your assumption is correct.

Provided the LPC2138 is the SPI master, that's how to hook it up.