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maximum clock frequency of SPI3

Other Parts Discussed in Thread: ADS1299

Hi,

I am working on am437x . I am facing some issues while working with spi3 . I know that mcspi driver parses the info given in dts file. My ADS1299 module is connected to spi3 and I am not able get the desired frequency for my ADS1299 module . I have parsed max-spi-frequency of 40MHz from dts file in the child node of spi3 . But when trying to set freq of 20MHZ in my struct spi_transfer and do the transfer using spi_sync in my module driver, My frequency only limits to max 12 MHZ . why is it so? How do I set frequency to my spi message transfer ?

Thanks
Rahul