Merge remote-tracking branch 'spi/topic/checks' into spi-next

include/linux/spi/spi.h

@@ -233,6 +233,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
  *	suported. If set, the SPI core will reject any transfer with an
  *	unsupported bits_per_word. If not set, this value is simply ignored,
  *	and it's up to the individual driver to perform any validation.
+ * @min_speed_hz: Lowest supported transfer speed
+ * @max_speed_hz: Highest supported transfer speed
  * @flags: other constraints relevant to this driver
  * @bus_lock_spinlock: spinlock for SPI bus locking
  * @bus_lock_mutex: mutex for SPI bus locking
@@ -312,6 +314,10 @@ struct spi_master {
 #define SPI_BIT_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
 #define SPI_BPW_RANGE_MASK(min, max) (SPI_BIT_MASK(max) - SPI_BIT_MASK(min - 1))
 
+	/* limits on transfer speed */
+	u32			min_speed_hz;
+	u32			max_speed_hz;
+
 	/* other constraints relevant to this driver */
 	u16			flags;
 #define SPI_MASTER_HALF_DUPLEX	BIT(0)		/* can't do full duplex */