i2c: mux: document i2c muxes and elaborate on parent-/mux-locked muxes

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 61a323a..1a8b11f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5275,6 +5275,7 @@
 M:	Peter Rosin <peda@axentia.se>
 L:	linux-i2c@vger.kernel.org
 S:	Maintained
+F:	Documentation/i2c/i2c-topology
 F:	Documentation/i2c/muxes/
 F:	Documentation/devicetree/bindings/i2c/i2c-mux*
 F:	drivers/i2c/i2c-mux.c