[PATCH v2 2/2] docs: add mux docs to the driver-api docs

[Peter Rosin <peda@axentia.se>]

Include both the overview and the more detailed api docs.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
 Documentation/driver-api/index.rst |  1 +
 Documentation/driver-api/mux.rst   | 25 +++++++++++++++++++++++++
 MAINTAINERS                        |  1 +
 3 files changed, 27 insertions(+)
 create mode 100644 Documentation/driver-api/mux.rst

diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index d17a9876b473..d10b01b2b429 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -47,6 +47,7 @@ available subsections can be seen below.
    gpio
    misc_devices
    dmaengine/index
+   mux
 
 .. only::  subproject and html
 
diff --git a/Documentation/driver-api/mux.rst b/Documentation/driver-api/mux.rst
new file mode 100644
index 000000000000..48fc5108ff0e
--- /dev/null
+++ b/Documentation/driver-api/mux.rst
@@ -0,0 +1,25 @@
+Multiplexer Subsystem
+=====================
+
+A multiplexer is a type of device that selects one of many signals and
+forwards this signal to a single output. A variant is a demultiplexer
+that instead forwards a single input to one of many outputs. There are
+also bidirectional variants. All these variants are handled the same
+by the multiplexer subsystem, and can be used to e.g. fan out an I2C
+bus to avoid client device address collisions or to allow converting
+more signals using a single analog to digital converter.
+
+Overview
+--------
+
+.. kernel-doc:: drivers/mux/core.c
+   :doc: overview
+
+Details
+-------
+
+.. kernel-doc:: include/linux/mux/driver.h
+   :internal:
+
+.. kernel-doc:: drivers/mux/core.c
+   :export:
diff --git a/MAINTAINERS b/MAINTAINERS
index d4fdcb12616c..2c0bbabedca0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9298,6 +9298,7 @@ M:	Peter Rosin <peda@axentia.se>
 S:	Maintained
 F:	Documentation/ABI/testing/mux/sysfs-class-mux*
 F:	Documentation/devicetree/bindings/mux/
+F:	Documentation/driver-api/mux.rst
 F:	include/linux/dt-bindings/mux/
 F:	include/linux/mux/
 F:	drivers/mux/
-- 
2.11.0