clk: renesas: Rework Kconfig and Makefile logic

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.

Note that currently not all (sub)drivers are enabled for
compile-testing, as they depend on independent fixes in other
subsystems.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 20 insertions, 17 deletions

diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
index 5b8fccf57478..aa24c2f5078c 100644
--- a/drivers/clk/renesas/Makefile
+++ b/drivers/clk/renesas/Makefile
@@ -1,19 +1,22 @@
-obj-$(CONFIG_ARCH_EMEV2)		+= clk-emev2.o
-obj-$(CONFIG_ARCH_R7S72100)		+= clk-rz.o
-obj-$(CONFIG_ARCH_R8A73A4)		+= clk-r8a73a4.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7740)		+= clk-r8a7740.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7743)		+= r8a7743-cpg-mssr.o rcar-gen2-cpg.o
-obj-$(CONFIG_ARCH_R8A7745)		+= r8a7745-cpg-mssr.o rcar-gen2-cpg.o
-obj-$(CONFIG_ARCH_R8A7778)		+= clk-r8a7778.o
-obj-$(CONFIG_ARCH_R8A7779)		+= clk-r8a7779.o
-obj-$(CONFIG_ARCH_R8A7790)		+= clk-rcar-gen2.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7791)		+= clk-rcar-gen2.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7792)		+= clk-rcar-gen2.o
-obj-$(CONFIG_ARCH_R8A7793)		+= clk-rcar-gen2.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7794)		+= clk-rcar-gen2.o clk-div6.o
-obj-$(CONFIG_ARCH_R8A7795)		+= r8a7795-cpg-mssr.o rcar-gen3-cpg.o
-obj-$(CONFIG_ARCH_R8A7796)		+= r8a7796-cpg-mssr.o rcar-gen3-cpg.o
-obj-$(CONFIG_ARCH_SH73A0)		+= clk-sh73a0.o clk-div6.o
+# SoC
+obj-$(CONFIG_CLK_EMEV2)			+= clk-emev2.o
+obj-$(CONFIG_CLK_RZA1)			+= clk-rz.o
+obj-$(CONFIG_CLK_R8A73A4)		+= clk-r8a73a4.o
+obj-$(CONFIG_CLK_R8A7740)		+= clk-r8a7740.o
+obj-$(CONFIG_CLK_R8A7743)		+= r8a7743-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A7745)		+= r8a7745-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A7778)		+= clk-r8a7778.o
+obj-$(CONFIG_CLK_R8A7779)		+= clk-r8a7779.o
+obj-$(CONFIG_CLK_R8A7795)		+= r8a7795-cpg-mssr.o
+obj-$(CONFIG_CLK_R8A7796)		+= r8a7796-cpg-mssr.o
+obj-$(CONFIG_CLK_SH73A0)		+= clk-sh73a0.o
 
-obj-$(CONFIG_CLK_RENESAS_CPG_MSSR)	+= renesas-cpg-mssr.o clk-div6.o
+# Family
+obj-$(CONFIG_CLK_RCAR_GEN2)		+= clk-rcar-gen2.o
+obj-$(CONFIG_CLK_RCAR_GEN2_CPG)		+= rcar-gen2-cpg.o
+obj-$(CONFIG_CLK_RCAR_GEN3_CPG)		+= rcar-gen3-cpg.o
+
+# Generic
+obj-$(CONFIG_CLK_RENESAS_CPG_MSSR)	+= renesas-cpg-mssr.o
 obj-$(CONFIG_CLK_RENESAS_CPG_MSTP)	+= clk-mstp.o
+obj-$(CONFIG_CLK_RENESAS_DIV6)		+= clk-div6.o