Dear Dmitry,

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Umm, one more thing - we need to add "depends on" to Kconfig since
clk API is not implemented on every platform. Any ideas what is the
most wide dependency is?

The most wide dependency for the clk API is HAVE_CLK.

Cool, thanks.

Sure, but why to add it to touchscreen's kconfig?
it seems it should be put arch/arm/kconfig.

In addition,I never use this HAVE_CLK in ARCH_W90X900, 
only using COMMON_CLKDEV to support clk API.