doc: Update sh cpufreq documentation.

The sh cpufreq driver is no longer limited to just the SH-3 and SH-4,
update the documentation to reflect this fact accordingly.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Author: pmundt

Documentation/cpu-freq/user-guide.txt

@@ -93,10 +93,8 @@ Several "PowerBook" and "iBook2" notebooks are supported.
 1.5 SuperH
 ----------
 
-The following SuperH processors are supported by cpufreq:
-
-SH-3
-SH-4
+All SuperH processors supporting rate rounding through the clock
+framework are supported by cpufreq.
 
 1.6 Blackfin
 ------------

arch/sh/Kconfig

@@ -469,8 +469,12 @@ config SH_CPU_FREQ
 	depends on CPU_FREQ
 	select CPU_FREQ_TABLE
 	help
-	  This adds the cpufreq driver for SuperH. At present, only
-	  the SH-4 is supported.
+	  This adds the cpufreq driver for SuperH. Any CPU that supports
+	  clock rate rounding through the clock framework can use this
+	  driver. While it will make the kernel slightly larger, this is
+	  harmless for CPUs that don't support rate rounding. The driver
+	  will also generate a notice in the boot log before disabling
+	  itself if the CPU in question is not capable of rate rounding.
 
 	  For details, take a look at <file:Documentation/cpu-freq>.