lantiq: correct value for fpi clock on ar9

This adds a patch to target/linux/lantiq/patches-3.14
fixing a bug clock code on ar9. The current version returns
the wrong value for the fpi clock frequency in some
cases.

See discussion for further details:
https://lists.openwrt.org/pipermail/openwrt-devel/2015-January/030688.html

I'm not sure about the patch naming and numbering convention.
Do please let me know it this is not OK.

Many thanks,

Ben Mulvihill

Signed-off-by: Ben Mulvihill <ben.mulvihill@gmail.com>
SVN-Revision: 44083

diff --git a/target/linux/lantiq/patches-3.14/0038-MIPS-lantiq-fpi-on-ar9.patch b/target/linux/lantiq/patches-3.14/0038-MIPS-lantiq-fpi-on-ar9.patch
new file mode 100644 (file)
index 0000000..cfa3a1f
--- /dev/null
+++ b/target/linux/lantiq/patches-3.14/0038-MIPS-lantiq-fpi-on-ar9.patch
@@ -0,0 +1,21 @@
+Return correct value for fpi clock on ar9.
+
+Signed-off-by: Ben Mulvihill <ben.mulvihill@gmail.com>
+---
+ arch/mips/lantiq/xway/clk.c |    5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+--- a/arch/mips/lantiq/xway/clk.c      2015-01-21 10:15:44.000000000 +0100
++++ b/arch/mips/lantiq/xway/clk.c      2015-01-21 10:17:29.000000000 +0100
+@@ -104,8 +104,9 @@ unsigned long ltq_ar9_fpi_hz(void)
+       unsigned long sys = ltq_ar9_sys_hz();
+ 
+       if (ltq_cgu_r32(CGU_SYS) & BIT(0))
+-              return sys;
+-      return sys >> 1;
++              return sys / 3;
++      else
++              return sys / 2;
+ }
+ 
+ unsigned long ltq_ar9_cpu_hz(void)