2 files changed, 38 insertions, 1 deletions

diff --git a/Documentation/spi/00-INDEX b/Documentation/spi/00-INDEX
new file mode 100644
index 000000000000..a128fa835512
--- /dev/null
+++ b/Documentation/spi/00-INDEX
@@ -0,0 +1,22 @@
+00-INDEX
+        - this file.
+Makefile
+        - Makefile for the example sourcefiles.
+butterfly
+        - AVR Butterfly SPI driver overview and pin configuration.
+ep93xx_spi
+        - Basic EP93xx SPI driver configuration.
+pxa2xx
+        - PXA2xx SPI master controller build by spi_message fifo wq
+spidev
+        - Intro to the userspace API for spi devices
+spidev_fdx.c
+        - spidev example file
+spi-lm70llp
+        - Connecting an LM70-LLP sensor to the kernel via the SPI subsys.
+spi-sc18is602
+        - NXP SC18IS602/603 I2C-bus to SPI bridge
+spi-summary
+        - (Linux) SPI overview. If unsure about SPI or SPI in Linux, start here.
+spidev_test.c
+        - SPI testing utility.
diff --git a/Documentation/spi/spi-summary b/Documentation/spi/spi-summary
index f72e0d1e0da8..7982bcc4d151 100644
--- a/Documentation/spi/spi-summary
+++ b/Documentation/spi/spi-summary
@@ -543,7 +543,22 @@ SPI MASTER METHODS
         queuing transfers that arrive in the meantime. When the driver is
         finished with this message, it must call
         spi_finalize_current_message() so the subsystem can issue the next
-        transfer. This may sleep.
+        message. This may sleep.
+
+    master->transfer_one(struct spi_master *master, struct spi_device *spi,
+                         struct spi_transfer *transfer)
+        The subsystem calls the driver to transfer a single transfer while
+        queuing transfers that arrive in the meantime. When the driver is
+        finished with this transfer, it must call
+        spi_finalize_current_transfer() so the subsystem can issue the next
+        transfer. This may sleep. Note: transfer_one and transfer_one_message
+        are mutually exclusive; when both are set, the generic subsystem does
+        not call your transfer_one callback.
+
+        Return values:
+        negative errno: error
+        0: transfer is finished
+        1: transfer is still in progress
 
     DEPRECATED METHODS