Author: Jan Christoph Ebersbach <jceb@e-jc.de>
URL: no URL yet
Straight forward patch to focus the master window with a keybinding.

Index: dwm/focusmaster.c
===================================================================
--- /dev/null
+++ dwm/focusmaster.c
@@ -0,0 +1,4 @@
+static void
+focusmaster(const Arg *arg) {
+	focus(nexttiled(selmon->clients));
+}