[PATCH 1/2] mfd: rsmu: fix mixed module-builtin object

[Masahiro Yamada <masahiroy@kernel.org>]

With CONFIG_MFD_RSMU_I2C=m and CONFIG_MFD_RSMU_SPI=y (or vice versa),
rsmu_core.o is linked to a module and also to vmlinux even though the
expected CFLAGS are different between builtins and modules.

This is the same situation as fixed by commit 637a642f5ca5 ("zstd:
Fixing mixed module-builtin objects").

Split rsmu-core into a separate module.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 drivers/mfd/Kconfig     | 8 ++++++--
 drivers/mfd/Makefile    | 6 ++++--
 drivers/mfd/rsmu_core.c | 3 +++
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index e90463c4441c..1b2eeb654e91 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2215,10 +2215,14 @@ config MFD_INTEL_M10_BMC_PMCI
 	  additional drivers must be enabled in order to use the functionality
 	  of the device.
 
+config MFD_RSMU_CORE
+	tristate
+	select MFD_CORE
+
 config MFD_RSMU_I2C
 	tristate "Renesas Synchronization Management Unit with I2C"
 	depends on I2C && OF
-	select MFD_CORE
+	select MFD_RSMU_CORE
 	select REGMAP_I2C
 	help
 	  Support for the Renesas Synchronization Management Unit, such as
@@ -2232,7 +2236,7 @@ config MFD_RSMU_I2C
 config MFD_RSMU_SPI
 	tristate "Renesas Synchronization Management Unit with SPI"
 	depends on SPI && OF
-	select MFD_CORE
+	select MFD_RSMU_CORE
 	select REGMAP_SPI
 	help
 	  Support for the Renesas Synchronization Management Unit, such as
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 1d2392f06f78..2a0e80f941a1 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -271,7 +271,9 @@ obj-$(CONFIG_MFD_INTEL_M10_BMC_PMCI)   += intel-m10-bmc-pmci.o
 obj-$(CONFIG_MFD_ATC260X)	+= atc260x-core.o
 obj-$(CONFIG_MFD_ATC260X_I2C)	+= atc260x-i2c.o
 
-rsmu-i2c-objs			:= rsmu_core.o rsmu_i2c.o
-rsmu-spi-objs			:= rsmu_core.o rsmu_spi.o
+rsmu-core-objs			:= rsmu_core.o
+rsmu-i2c-objs			:= rsmu_i2c.o
+rsmu-spi-objs			:= rsmu_spi.o
+obj-$(CONFIG_MFD_RSMU_CORE)	+= rsmu-core.o
 obj-$(CONFIG_MFD_RSMU_I2C)	+= rsmu-i2c.o
 obj-$(CONFIG_MFD_RSMU_SPI)	+= rsmu-spi.o
diff --git a/drivers/mfd/rsmu_core.c b/drivers/mfd/rsmu_core.c
index 29437fd0bd5b..5bf1e23a47e5 100644
--- a/drivers/mfd/rsmu_core.c
+++ b/drivers/mfd/rsmu_core.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2021 Integrated Device Technology, Inc., a Renesas Company.
  */
 
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mfd/core.h>
@@ -78,11 +79,13 @@ int rsmu_core_init(struct rsmu_ddata *rsmu)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(rsmu_core_init);
 
 void rsmu_core_exit(struct rsmu_ddata *rsmu)
 {
 	mutex_destroy(&rsmu->lock);
 }
+EXPORT_SYMBOL_GPL(rsmu_core_exit);
 
 MODULE_DESCRIPTION("Renesas SMU core driver");
 MODULE_LICENSE("GPL");
-- 
2.39.2