Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64...

[karo-tx-linux.git] / Documentation / spi / spidev

diff --git a/Documentation/spi/spidev b/Documentation/spi/spidev
index ed2da5e5b28a4490a3b03787b02df66d083692be..3d14035b1766994b537fb273d20dffc92d9554d9 100644 (file)
--- a/Documentation/spi/spidev
+++ b/Documentation/spi/spidev
@@ -85,6 +85,12 @@ settings for data transfer parameters:
        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