tFrequency units are part of the plugin - spoon - dwm status utility (2f30 fork)
  HTML git clone git://src.adamsgaard.dk/spoon
   DIR Log
   DIR Files
   DIR Refs
   DIR LICENSE
       ---
   DIR commit 539ec046cefa273e60a99d53415df6678ee24455
   DIR parent 5dd39d54cc2786fbb8f6d559943357dc59541567
  HTML Author: lostd <lostd@2f30.org>
       Date:   Fri, 20 May 2016 23:26:46 +0100
       
       Frequency units are part of the plugin
       
       Diffstat:
         M spoon.c                             |       4 ++--
       
       1 file changed, 2 insertions(+), 2 deletions(-)
       ---
   DIR diff --git a/spoon.c b/spoon.c
       t@@ -30,7 +30,7 @@ struct ent {
                /* reorder this if you want */
                { .fmt = "[%s] ", .read = mpdread },
                { .fmt = "[%s] ", .read = xkblayoutread },
       -        { .fmt = "[%sMHz] ", .read = cpuread },
       +        { .fmt = "[%s] ", .read = cpuread },
                { .fmt = "[%s] ", .read = tempread },
                { .fmt = "%s ", .read = battread },
                { .fmt = "%s ", .read = wifiread },
       t@@ -106,7 +106,7 @@ cpuread(char *buf, size_t len)
                sz = sizeof(cpuspeed);
                if (sysctl(mib, 2, &cpuspeed, &sz, NULL, 0) < 0)
                        return -1;
       -        snprintf(buf, len, "%4d", cpuspeed);
       +        snprintf(buf, len, "%4dMHz", cpuspeed);
                return 0;
        }