+static const u32 cs_mask[] = {
+ SPI_ADC_CS_MASK,
+ SPI_DAC_CS_MASK,
+};
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return bus == 0 && cs < sizeof(cs_mask) / sizeof(cs_mask[0]);
+}
+
+void spi_cs_activate(struct spi_slave *slave)