[Blackfin] arch: Add a warning about the value of CLKIN.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index eba22c219820fa51c77986c978d680d7deb0164f..795d0ac67c2192a93c6fd0404bb3e9fed92c45d7 100644 (file)
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -289,7 +289,7 @@ config BOOT_LOAD
 comment "Clock/PLL Setup"
 
 config CLKIN_HZ
-       int "Crystal Frequency in Hz"
+       int "Frequency of the crystal on the board in Hz"
        default "11059200" if BFIN533_STAMP
        default "27000000" if BFIN533_EZKIT
        default "25000000" if (BFIN537_STAMP || BFIN527_EZKIT || H8606_HVSISTEMAS)
@@ -298,6 +298,8 @@ config CLKIN_HZ
        default "10000000" if BFIN532_IP0X
        help
          The frequency of CLKIN crystal oscillator on the board in Hz.
+         Warning: This value should match the crystal on the board. Otherwise,
+         peripherals won't work properly.
 
 config BFIN_KERNEL_CLOCK
        bool "Re-program Clocks while Kernel boots?"