linux-kernel - [PATCH] clk: samsung: allow building the clkout driver as module

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Message-Id: <20201110193749.261367-1-krzk@kernel.org>
Date:   Tue, 10 Nov 2020 20:37:49 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] 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@...nel.org>
---
 drivers/clk/samsung/Kconfig             | 10 ++++++++++
 drivers/clk/samsung/Makefile            |  2 +-
 drivers/clk/samsung/clk-exynos-clkout.c |  1 +
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/Kconfig b/drivers/clk/samsung/Kconfig
index 57d4b3f20417..b6b2cb209543 100644
--- 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_CLK_OUT
+	tristate "Samsung Exynos clock output driver"
+	depends on COMMON_CLK_SAMSUNG
+	default y if ARCH_EXYNOS
+	help
+	  Support for the clock output (XCLKOUT) driver 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 1a4e6b787978..4adbf972e9f6 100644
--- 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_CLK_OUT)	+= 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 f5f8a956b316..9ec2f40cc400 100644
--- 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
-- 
2.25.1