[PATCH/RFC 1/2] clk: renesas: Rework Kconfig and Makefile logic

[Stephen Boyd]

On 04/25, Geert Uytterhoeven wrote:
> The goals are to:
>   - Allow precise control over and automatic selection of which
>     (sub)drivers are used for which SoC (which may change in the
>     future),
>   - Allow adding support for new SoCs easily,
>   - Allow compile-testing of all (sub)drivers,
>   - Keep driver selection logic in the subsystem-specific Kconfig
>     independent from the architecture-specific Kconfig (i.e. no "select"
>     from arch/arm64/Kconfig.platforms), to avoid dependencies.
> 
> This is implemented by:
>   - Introducing Kconfig symbols for all drivers and sub-drivers,
>   - Introducing the Kconfig symbol CLK_RENESAS, which is enabled
>     automatically when building for a Renesas ARM platform, and which
>     enables all required drivers without interaction of the user, based
>     on SoC-specific ARCH_* symbols,
>   - Allowing the user to enable any Kconfig symbol manually if
>     COMPILE_TEST is enabled,
>   - Using the new Kconfig symbols instead of the ARCH_* symbols to
>     control compilation in the Makefile,
>   - Always entering drivers/clk/renesas/ during the build.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> ---

Acked-by: Stephen Boyd <sboyd at codeaurora.org>

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