--- zzzz-none-000/linux-3.10.107/Documentation/spi/spidev	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/spi/spidev	2021-02-04 17:41:59.000000000 +0000
@@ -85,6 +85,12 @@
 	SPI_MODE_0..SPI_MODE_3; or if you prefer you can combine SPI_CPOL
 	(clock polarity, idle high iff this is set) or SPI_CPHA (clock phase,
 	sample on trailing edge iff this is set) flags.
+	Note that this request is limited to SPI mode flags that fit in a
+	single byte.
+
+    SPI_IOC_RD_MODE32, SPI_IOC_WR_MODE32 ... pass a pointer to a uin32_t
+	which will return (RD) or assign (WR) the full SPI transfer mode,
+	not limited to the bits that fit in one byte.
 
     SPI_IOC_RD_LSB_FIRST, SPI_IOC_WR_LSB_FIRST ... pass a pointer to a byte
 	which will return (RD) or assign (WR) the bit justification used to