spi: core: remove 'delay_usecs' field from spi_transfer

The 'delay' field in the spi_transfer struct is meant to replace the
'delay_usecs' field. However some cleanup was required to remove the
uses of 'delay_usecs'. Now that it's been cleaned up, we can remove it
from the kernel tree.
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210308145502.1075689-10-aardelean@deviqon.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -3178,7 +3178,6 @@ struct spi_replaced_transfers *spi_replace_transfers(
 		/* clear cs_change and delay for all but the last */
 		if (i) {
 			xfer->cs_change = false;
-			xfer->delay_usecs = 0;
 			xfer->delay.value = 0;
 		}
 	}

include/linux/spi/spi.h

@@ -832,9 +832,6 @@ extern void spi_res_release(struct spi_controller *ctlr,
  * @delay: delay to be introduced after this transfer before
  *	(optionally) changing the chipselect status, then starting
  *	the next transfer or completing this @spi_message.
- * @delay_usecs: microseconds to delay after this transfer before
- *	(optionally) changing the chipselect status, then starting
- *	the next transfer or completing this @spi_message.
  * @word_delay: inter word delay to be introduced after each word size
  *	(set by bits_per_word) transmission.
  * @effective_speed_hz: the effective SCK-speed that was used to
@@ -946,7 +943,6 @@ struct spi_transfer {
 #define	SPI_NBITS_DUAL		0x02 /* 2bits transfer */
 #define	SPI_NBITS_QUAD		0x04 /* 4bits transfer */
 	u8		bits_per_word;
-	u16		delay_usecs;
 	struct spi_delay	delay;
 	struct spi_delay	cs_change_delay;
 	struct spi_delay	word_delay;
@@ -1060,14 +1056,6 @@ spi_transfer_del(struct spi_transfer *t)
 static inline int
 spi_transfer_delay_exec(struct spi_transfer *t)
 {
-	struct spi_delay d;
-
-	if (t->delay_usecs) {
-		d.value = t->delay_usecs;
-		d.unit = SPI_DELAY_UNIT_USECS;
-		return spi_delay_exec(&d, NULL);
-	}
-
 	return spi_delay_exec(&t->delay, t);
 }