clk: davinci: add COMPILE_TEST support

Add a driver-scoped Kconfig symbol for the DaVinci clock drivers so
they can be built through COMPILE_TEST without selecting the ARM
DaVinci platform symbols.

Keep the existing ARM platform behavior by defaulting the new symbol
from ARCH_DAVINCI, and use it for the davinci clock Makefile entries.
ARCH_DAVINCI_DA850 is the only remaining DaVinci platform symbol, so a
single COMMON_CLK_DAVINCI symbol suffices; the whole directory builds
together just fine.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Brian Masney <bmasney@redhat.com>

drivers/clk/Kconfig

@@ -510,6 +510,7 @@ source "drivers/clk/analogbits/Kconfig"
 source "drivers/clk/aspeed/Kconfig"
 source "drivers/clk/bcm/Kconfig"
 source "drivers/clk/cix/Kconfig"
+source "drivers/clk/davinci/Kconfig"
 source "drivers/clk/eswin/Kconfig"
 source "drivers/clk/hisilicon/Kconfig"
 source "drivers/clk/imgtec/Kconfig"

drivers/clk/Makefile

@@ -132,7 +132,7 @@ obj-$(CONFIG_ARC_PLAT_AXS10X)		+= axs10x/
 obj-y					+= bcm/
 obj-$(CONFIG_ARCH_BERLIN)		+= berlin/
 obj-y					+= cix/
-obj-$(CONFIG_ARCH_DAVINCI)		+= davinci/
+obj-$(CONFIG_COMMON_CLK_DAVINCI)	+= davinci/
 obj-$(CONFIG_COMMON_CLK_ESWIN)		+= eswin/
 obj-$(CONFIG_COMMON_CLK_HISI)		+= hisilicon/
 obj-y					+= imgtec/

drivers/clk/davinci/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config COMMON_CLK_DAVINCI
+	bool "Clock drivers for TI DaVinci SoCs"
+	depends on ARCH_DAVINCI || COMPILE_TEST
+	depends on HAS_IOMEM
+	select REGMAP_MMIO
+	select RESET_CONTROLLER
+	default ARCH_DAVINCI
+	help
+	  Support for the clock controllers found on TI DaVinci SoCs.

drivers/clk/davinci/Makefile

@@ -1,11 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
 
-ifeq ($(CONFIG_COMMON_CLK), y)
-obj-$(CONFIG_ARCH_DAVINCI_DA8XX)	+= da8xx-cfgchip.o
+obj-y += da8xx-cfgchip.o
 
 obj-y += pll.o
-obj-$(CONFIG_ARCH_DAVINCI_DA850)	+= pll-da850.o
+obj-y += pll-da850.o
 
 obj-y += psc.o
-obj-$(CONFIG_ARCH_DAVINCI_DA850)	+= psc-da850.o
-endif
+obj-y += psc-da850.o