clk: samsung: allow building the clkout driver as module

The Exynos clock output driver can be built as module (it does not have
to be part of core init process) for better customization.  Adding a
KConfig entry allows also compile testing for build coverage.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20201110193749.261367-1-krzk@kernel.org

diff --git a/drivers/clk/samsung/Kconfig b/drivers/clk/samsung/Kconfig
index 57d4b3f20417fd994ecf5173b90d6eceb9567673..7e9c186e57efbdea95cde0d8cb85f2b0b3ed3f5f 100644 (file)
--- a/drivers/clk/samsung/Kconfig
+++ b/drivers/clk/samsung/Kconfig
@@ -19,6 +19,16 @@ config EXYNOS_AUDSS_CLK_CON
          on some Exynos SoC variants. Choose M or Y here if you want to
          use audio devices such as I2S, PCM, etc.
 
+config EXYNOS_CLKOUT
+       tristate "Samsung Exynos clock output driver"
+       depends on COMMON_CLK_SAMSUNG
+       default y if ARCH_EXYNOS
+       help
+         Support for the clock output (XCLKOUT) present on some of Exynos SoC
+         variants. Usually the XCLKOUT is used to monitor the status of the
+         certains clocks from SoC, but it could also be tied to other devices
+         as an input clock.
+
 # For S3C24XX platforms, select following symbols:
 config S3C2410_COMMON_CLK
        bool "Samsung S3C2410 clock controller support" if COMPILE_TEST

diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile
index 1a4e6b787978383ba44252a9e70cb587dea659fa..6891b087acff26fee30342289fe559ee3931b8e8 100644 (file)
--- a/drivers/clk/samsung/Makefile
+++ b/drivers/clk/samsung/Makefile
@@ -15,7 +15,7 @@ obj-$(CONFIG_SOC_EXYNOS5420)  += clk-exynos5420.o
 obj-$(CONFIG_SOC_EXYNOS5420)   += clk-exynos5-subcmu.o
 obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)  += clk-exynos5433.o
 obj-$(CONFIG_EXYNOS_AUDSS_CLK_CON) += clk-exynos-audss.o
-obj-$(CONFIG_ARCH_EXYNOS)      += clk-exynos-clkout.o
+obj-$(CONFIG_EXYNOS_CLKOUT)    += clk-exynos-clkout.o
 obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)  += clk-exynos7.o
 obj-$(CONFIG_S3C2410_COMMON_CLK)+= clk-s3c2410.o
 obj-$(CONFIG_S3C2410_COMMON_DCLK)+= clk-s3c2410-dclk.o

diff --git a/drivers/clk/samsung/clk-exynos-clkout.c b/drivers/clk/samsung/clk-exynos-clkout.c
index f5f8a956b316a0eda979edcda2863e332e1b4784..9ec2f40cc400bd0dd01d1d725170a811a8a2ccb2 100644 (file)
--- a/drivers/clk/samsung/clk-exynos-clkout.c
+++ b/drivers/clk/samsung/clk-exynos-clkout.c
@@ -72,6 +72,7 @@ static const struct of_device_id exynos_clkout_ids[] = {
                .data = &exynos_clkout_exynos5,
        }, { }
 };
+MODULE_DEVICE_TABLE(of, exynos_clkout_ids);
 
 /*
  * Device will be instantiated as child of PMU device without its own