mfd: arizona: Allow building arizona MFD-core as module

There is no reason why the arizona core,irq and codec model specific
regmap bits cannot be build as a module. All they do is export symbols
which are used by the arizona-spi/i2c and arizona-codec modules, which
themselves can be built as module.

Change the Kconfig and Makefile arizona bits so that the arizona MFD-core
can be built as a module.

This is especially useful on x86 platforms with a WM5102 codec, this
allows the arizona MFD driver necessary for the WM5102 codec to be
enabled in generic distro-kernels without growing the base kernel-image
size.

Note this also adds an explicit "depends on MFD_ARIZONA" to all the
arizona codec Kconfig options. The codec drivers use functions from mfd
arizona-core. These new depends are necessary to disallow the codec
drivers being builtin when the arizona-core is build as a module,
otherwise we end up with missing symbol errors when building vmlinuz.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/Kconfig

@@ -1800,7 +1800,7 @@ config MFD_ARIZONA
 	select REGMAP
 	select REGMAP_IRQ
 	select MFD_CORE
-	bool
+	tristate
 
 config MFD_ARIZONA_I2C
 	tristate "Cirrus Logic/Wolfson Microelectronics Arizona platform with I2C"

drivers/mfd/Makefile

@@ -41,24 +41,24 @@ obj-$(CONFIG_MFD_TQMX86)	+= tqmx86.o
 
 obj-$(CONFIG_MFD_LOCHNAGAR)	+= lochnagar-i2c.o
 
-obj-$(CONFIG_MFD_ARIZONA)	+= arizona-core.o
-obj-$(CONFIG_MFD_ARIZONA)	+= arizona-irq.o
+arizona-objs			:= arizona-core.o arizona-irq.o
+obj-$(CONFIG_MFD_ARIZONA)	+= arizona.o
 obj-$(CONFIG_MFD_ARIZONA_I2C)	+= arizona-i2c.o
 obj-$(CONFIG_MFD_ARIZONA_SPI)	+= arizona-spi.o
 ifeq ($(CONFIG_MFD_WM5102),y)
-obj-$(CONFIG_MFD_ARIZONA)	+= wm5102-tables.o
+arizona-objs			+= wm5102-tables.o
 endif
 ifeq ($(CONFIG_MFD_WM5110),y)
-obj-$(CONFIG_MFD_ARIZONA)	+= wm5110-tables.o
+arizona-objs			+= wm5110-tables.o
 endif
 ifeq ($(CONFIG_MFD_WM8997),y)
-obj-$(CONFIG_MFD_ARIZONA)	+= wm8997-tables.o
+arizona-objs			+= wm8997-tables.o
 endif
 ifeq ($(CONFIG_MFD_WM8998),y)
-obj-$(CONFIG_MFD_ARIZONA)	+= wm8998-tables.o
+arizona-objs			+= wm8998-tables.o
 endif
 ifeq ($(CONFIG_MFD_CS47L24),y)
-obj-$(CONFIG_MFD_ARIZONA)	+= cs47l24-tables.o
+arizona-objs			+= cs47l24-tables.o
 endif
 obj-$(CONFIG_MFD_WCD934X)	+= wcd934x.o
 obj-$(CONFIG_MFD_WM8400)	+= wm8400-core.o

drivers/mfd/arizona-core.c

@@ -1447,3 +1447,5 @@ int arizona_dev_exit(struct arizona *arizona)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(arizona_dev_exit);
+
+MODULE_LICENSE("GPL v2");

sound/soc/codecs/Kconfig

@@ -690,7 +690,7 @@ config SND_SOC_CS47L15
 
 config SND_SOC_CS47L24
 	tristate
-	depends on MFD_CS47L24
+	depends on MFD_CS47L24 && MFD_ARIZONA
 
 config SND_SOC_CS47L35
 	tristate
@@ -1564,11 +1564,11 @@ config SND_SOC_WM5100
 
 config SND_SOC_WM5102
 	tristate
-	depends on MFD_WM5102
+	depends on MFD_WM5102 && MFD_ARIZONA
 
 config SND_SOC_WM5110
 	tristate
-	depends on MFD_WM5110
+	depends on MFD_WM5110 && MFD_ARIZONA
 
 config SND_SOC_WM8350
 	tristate
@@ -1733,11 +1733,11 @@ config SND_SOC_WM8996
 
 config SND_SOC_WM8997
 	tristate
-	depends on MFD_WM8997
+	depends on MFD_WM8997 && MFD_ARIZONA
 
 config SND_SOC_WM8998
 	tristate
-	depends on MFD_WM8998
+	depends on MFD_WM8998 && MFD_ARIZONA
 
 config SND_SOC_WM9081
 	tristate