mfd: sec: Split into core and transport (i2c) drivers

As a preparation for adding support for Samsung's S2MPG10, which is
connected via SPEEDY / ACPM rather than I2C, split out (move) all
I2C-specific driver code into its own kernel module, sec-i2c, and
make the existing sec-core module be just the transport-agnostic core
driver kernel module.

At the same time, update all defconfigs that reference the old kconfig
symbol name.

While at it, also update file header comments and module description(s)
to drop references to 'mfd', and update comments to be C-style, not
C++.

Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: André Draszik <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: andred

arch/arm/configs/exynos_defconfig

@@ -167,7 +167,7 @@ CONFIG_MFD_MAX77686=y
 CONFIG_MFD_MAX77693=y
 CONFIG_MFD_MAX8997=y
 CONFIG_MFD_MAX8998=y
-CONFIG_MFD_SEC_CORE=y
+CONFIG_MFD_SEC_I2C=y
 CONFIG_MFD_STMPE=y
 CONFIG_STMPE_I2C=y
 CONFIG_MFD_TPS65090=y

arch/arm/configs/multi_v7_defconfig

@@ -612,7 +612,7 @@ CONFIG_MFD_QCOM_RPM=y
 CONFIG_MFD_SPMI_PMIC=y
 CONFIG_MFD_RK8XX_I2C=y
 CONFIG_MFD_RN5T618=y
-CONFIG_MFD_SEC_CORE=y
+CONFIG_MFD_SEC_I2C=y
 CONFIG_MFD_STMPE=y
 CONFIG_MFD_PALMAS=y
 CONFIG_MFD_TPS65090=y

arch/arm/configs/pxa_defconfig

@@ -335,7 +335,7 @@ CONFIG_MFD_MAX77693=y
 CONFIG_MFD_MAX8907=m
 CONFIG_EZX_PCAP=y
 CONFIG_UCB1400_CORE=m
-CONFIG_MFD_SEC_CORE=y
+CONFIG_MFD_SEC_I2C=y
 CONFIG_MFD_PALMAS=y
 CONFIG_MFD_TPS65090=y
 CONFIG_MFD_TPS6586X=y

arch/arm64/configs/defconfig

@@ -769,7 +769,7 @@ CONFIG_MFD_MT6397=y
 CONFIG_MFD_SPMI_PMIC=y
 CONFIG_MFD_RK8XX_I2C=y
 CONFIG_MFD_RK8XX_SPI=y
-CONFIG_MFD_SEC_CORE=y
+CONFIG_MFD_SEC_I2C=y
 CONFIG_MFD_SL28CPLD=y
 CONFIG_RZ_MTU3=y
 CONFIG_MFD_TI_AM335X_TSCADC=m

drivers/mfd/Kconfig

@@ -1312,21 +1312,25 @@ config MFD_RN5T618
 	  functionality of the device.
 
 config MFD_SEC_CORE
-	tristate "Samsung Electronics PMIC Series Support"
+	tristate
+	select MFD_CORE
+	select REGMAP_IRQ
+
+config MFD_SEC_I2C
+	tristate "Samsung Electronics S2MPA/S2MPS1X/S2MPU/S5M series PMICs"
 	depends on I2C=y
 	depends on OF
-	select MFD_CORE
+	select MFD_SEC_CORE
 	select REGMAP_I2C
-	select REGMAP_IRQ
 	help
-	  Support for the Samsung Electronics PMIC devices coming
-	  usually along with Samsung Exynos SoC chipset.
+	  Support for the Samsung Electronics PMIC devices with I2C interface
+	  coming usually along with Samsung Exynos SoC chipset.
 	  This driver provides common support for accessing the device,
 	  additional drivers must be enabled in order to use the functionality
-	  of the device
+	  of the device.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called sec-core.
+	  module will be called sec-i2c.
 	  Have in mind that important core drivers (like regulators) depend
 	  on this driver so building this as a module might require proper
 	  initial ramdisk or might not boot up as well in certain scenarios.

drivers/mfd/Makefile

@@ -230,6 +230,7 @@ obj-$(CONFIG_MFD_RK8XX_I2C)	+= rk8xx-i2c.o
 obj-$(CONFIG_MFD_RK8XX_SPI)	+= rk8xx-spi.o
 obj-$(CONFIG_MFD_RN5T618)	+= rn5t618.o
 obj-$(CONFIG_MFD_SEC_CORE)	+= sec-core.o sec-irq.o
+obj-$(CONFIG_MFD_SEC_I2C)	+= sec-i2c.o
 obj-$(CONFIG_MFD_SYSCON)	+= syscon.o
 obj-$(CONFIG_MFD_LM3533)	+= lm3533-core.o lm3533-ctrlbank.o
 obj-$(CONFIG_MFD_VEXPRESS_SYSREG)	+= vexpress-sysreg.o