document clocksources

Document the available clocksources per platform and move clocksource= into
the correct (alpha) location in the file.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 4 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 09220a1e22d9..aae2282600ca 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -396,6 +396,26 @@ and is between 256 and 4096 characters. It is defined in the file
                         clocksource is not available, it defaults to PIT.
                         Format: { pit | tsc | cyclone | pmtmr }
 
+        clocksource=    [GENERIC_TIME] Override the default clocksource
+                        Format: <string>
+                        Override the default clocksource and use the clocksource
+                        with the name specified.
+                        Some clocksource names to choose from, depending on
+                        the platform:
+                        [all] jiffies (this is the base, fallback clocksource)
+                        [ACPI] acpi_pm
+                        [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2,
+                                pxa_timer,timer3,32k_counter,timer0_1
+                        [AVR32] avr32
+                        [IA-32] pit,hpet,tsc,vmi-timer;
+                                scx200_hrt on Geode; cyclone on IBM x440
+                        [MIPS] MIPS
+                        [PARISC] cr16
+                        [S390] tod
+                        [SH] SuperH
+                        [SPARC64] tick
+                        [X86-64] hpet,tsc
+
         code_bytes      [IA32] How many bytes of object code to print in an
                         oops report.
                         Range: 0 - 8192
@@ -1807,10 +1827,6 @@ and is between 256 and 4096 characters. It is defined in the file
 
         time            Show timing data prefixed to each printk message line
 
-        clocksource=    [GENERIC_TIME] Override the default clocksource
-                        Override the default clocksource and use the clocksource
-                        with the name specified.
-
         tipar.timeout=  [HW,PPT]
                         Set communications timeout in tenths of a second
                         (default 15).