OMAPL138 SPI1 CS pinmux in kernel

Hi 

     I'm working on OMAPl138 LCDK kit. I need to enable SPI1 master to connect my SPI device with J16 header.

J16 have  SPI1_SOMI,  SPI1_SIMO,  SPI1_CLK, SPI1_SCSn_3,  SPI1_SCSn_7,  SPI1_SCSn_6 

I have initiated the SPI1 by the function call 

      da8xx_register_spi(1, da830evm_spi_info, ARRAY_SIZE(da830evm_spi_info));

But there is no pinmux initialize part in board file.

How to configure SPI1 with any one of above mentioned chip select pins and how to configure pinmux function, is there any sample function for SPI pin muxing ?