diff --git a/src/include/spi-generic.h b/src/include/spi-generic.h
index b7a14f9..6c62de6 100644
--- a/src/include/spi-generic.h
+++ b/src/include/spi-generic.h
@@ -120,27 +120,17 @@
 /*-----------------------------------------------------------------------
  * SPI transfer
  *
- * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
- * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
- *
- * The source of the outgoing bits is the "dout" parameter and the
- * destination of the input bits is the "din" parameter.  Note that "dout"
- * and "din" can point to the same memory location, in which case the
- * input data overwrites the output data (since both are buffered by
- * temporary variables, this is OK).
- *
  * spi_xfer() interface:
  *   slave:	The SPI slave which will be sending/receiving the data.
- *   dout:	Pointer to a string of bits to send out.  The bits are
- *		held in a byte array and are sent MSB first.
- *   bitsout:	How many bits to write.
- *   din:	Pointer to a string of bits that will be filled in.
- *   bitsin:	How many bits to read.
+ *   dout:	Pointer to a string of bytes to send out.
+ *   bytesout:	How many bytes to write.
+ *   din:	Pointer to a string of bytes that will be filled in.
+ *   bytesin:	How many bytes to read.
  *
  *   Returns: 0 on success, not 0 on failure
  */
-int  spi_xfer(struct spi_slave *slave, const void *dout, unsigned int bitsout,
-		void *din, unsigned int bitsin);
+int  spi_xfer(struct spi_slave *slave, const void *dout, unsigned int bytesout,
+		void *din, unsigned int bytesin);
 
 /*-----------------------------------------------------------------------
  * Determine if a SPI chipselect is valid.
@@ -196,7 +186,7 @@
 	dout[0] = byte;
 	dout[1] = 0;
 
-	ret = spi_xfer(slave, dout, 16, din, 16);
+	ret = spi_xfer(slave, dout, 2, din, 2);
 	return ret < 0 ? ret : din[1];
 }