On Thu, Nov 11, 2021 at 02:51:58PM +0800, nandhini.srikandan@intel.com wrote:
> From: Nandhini Srikandan <nandhini.srikandan@intel.com>
> 
> Add support for Slave Select Toggle Enable (SSTE) in DWC SSI controller
> via DTS. The slave select line will toggle between consecutive data frames,
> with the serial clock being held to its default value while slave
> select line is high.

This should be controlled by SPI_CS_WORD.