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From:   Krzysztof Kozlowski <krzk@kernel.org>
To:     Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Tomasz Figa <tomasz.figa@gmail.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH] clk: samsung: allow building the clkout driver as module
Date:   Tue, 10 Nov 2020 20:37:49 +0100
Message-Id: <20201110193749.261367-1-krzk@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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>
---
 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