/* Set chip select @s slave @cs chip select: ->slave, otherwise->deselect all  */
static int spi_m2s_hw_cs_set(struct m2s_spi_dsc *s, int cs)
/* Set chip select @s slave @cs chip select: ->slave, otherwise->deselect all  */
static int spi_m2s_hw_cs_set(struct m2s_spi_dsc *s, int cs)
{
	unsigned int v = (0 <= cs && cs <= 7) ? (1 << cs) : 0;
	M2S_SPI(s)->slave_select = v;
	return 0;
}