spi: docs: convert to ReST and add it to the kABI bookset
While there's one file there with briefily describes the uAPI,
the documentation was written just like most subsystems: focused
on kernel developers. So, add it together with driver-api books.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/index.rst b/Documentation/index.rst
index 6217aca..472b8ab 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -116,6 +116,7 @@
power/index
target/index
timers/index
+ spi/index
watchdog/index
virtual/index
input/index
