clk: meson: only build selected platforms

Break the AmLogic clock code up so that only the necessary parts are
compiled and linked. The core code is selected by both arm and arm64
builds with COMMON_CLK_AMLOGIC. The individual drivers have their own
config options as well.
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>

drivers/clk/Kconfig

@@ -208,6 +208,7 @@ config COMMON_CLK_OXNAS
 
 source "drivers/clk/bcm/Kconfig"
 source "drivers/clk/hisilicon/Kconfig"
+source "drivers/clk/meson/Kconfig"
 source "drivers/clk/mvebu/Kconfig"
 source "drivers/clk/qcom/Kconfig"
 source "drivers/clk/renesas/Kconfig"

drivers/clk/Makefile

@@ -65,7 +65,7 @@ ifeq ($(CONFIG_COMMON_CLK), y)
 obj-$(CONFIG_ARCH_MMP)			+= mmp/
 endif
 obj-y					+= mvebu/
-obj-$(CONFIG_ARCH_MESON)		+= meson/
+obj-$(CONFIG_COMMON_CLK_AMLOGIC)	+= meson/
 obj-$(CONFIG_ARCH_MXS)			+= mxs/
 obj-$(CONFIG_MACH_PISTACHIO)		+= pistachio/
 obj-$(CONFIG_COMMON_CLK_NXP)		+= nxp/

drivers/clk/meson/Kconfig

+config COMMON_CLK_AMLOGIC
+	bool
+	depends on OF
+	depends on ARCH_MESON || COMPILE_TEST
+
+config COMMON_CLK_MESON8B
+	bool
+	depends on COMMON_CLK_AMLOGIC
+	help
+	  Support for the clock controller on AmLogic S805 devices, aka
+	  meson8b. Say Y if you want peripherals and CPU frequency scaling to
+	  work.

drivers/clk/meson/Makefile

@@ -2,5 +2,5 @@
 # Makefile for Meson specific clk
 #
 
-obj-y += clk-pll.o clk-cpu.o
-obj-y += meson8b-clkc.o
+obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-cpu.o
+obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b-clkc.o