CONFIG_SOC_IMX28 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SOC_IMX28 (not configurable)

modulename: clk-imx28.ko

configname: CONFIG_SOC_IMX28

Linux Kernel Configuration
└─>SOC_IMX28
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
drivers/clk/mxs/clk-imx28.c


is depended by
CONFIG_ARCH_MXS