video/omap: fix modular build

The framebuffer layer can be a loadable module, which forces
omapfb to be a module as well. However, this breaks the lcd
drivers, which are linked into the omapfb driver but each
have their own module_init() function. To solve this,
we split out the lcd drivers into separate modules and
export omapfb_register_panel, which is the only interface
required between the main omapfb driver and the lcd panel
drivers.

We also have to introduce a new Kconfig symbol for H3, since
that lcd driver has a dependency on TPS65010, which we can
express better in Kconfig than Makefile syntax.

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Peter Griffin <[e-mail]>
Cc: Jean-Christophe Plagniol-Villard <[e-mail]>
Cc: Tomi Valkeinen <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Tomi Valkeinen <[e-mail]>

drivers/video/fbdev/omap/Kconfig

···
 	  the Mobile Industry Processor Interface DBI-C/DCS
 	  specification. (Supported LCDs: Philips LPH8923, Sharp LS041Y3)
 
+config FB_OMAP_LCD_H3
+	bool "TPS65010 LCD controller on OMAP-H3"
+	depends on MACH_OMAP_H3
+	depends on TPS65010
+	default y
+	help
+	  Say Y here if you want to have support for the LCD on the
+	  H3 board.
+
 config FB_OMAP_DMA_TUNE
         bool "Set DMA SDRAM access priority high"
         depends on FB_OMAP

drivers/video/fbdev/omap/Makefile

···
 
 objs-y$(CONFIG_FB_OMAP_LCDC_HWA742) += hwa742.o
 
-objs-y$(CONFIG_MACH_AMS_DELTA) += lcd_ams_delta.o
-objs-y$(CONFIG_MACH_OMAP_H3) += lcd_h3.o
-objs-y$(CONFIG_MACH_OMAP_PALMTE) += lcd_palmte.o
-objs-y$(CONFIG_MACH_OMAP_PALMTT) += lcd_palmtt.o
-objs-y$(CONFIG_MACH_OMAP_PALMZ71) += lcd_palmz71.o
-objs-$(CONFIG_ARCH_OMAP16XX)$(CONFIG_MACH_OMAP_INNOVATOR) += lcd_inn1610.o
-objs-$(CONFIG_ARCH_OMAP15XX)$(CONFIG_MACH_OMAP_INNOVATOR) += lcd_inn1510.o
-objs-y$(CONFIG_MACH_OMAP_OSK) += lcd_osk.o
+lcds-y$(CONFIG_MACH_AMS_DELTA) += lcd_ams_delta.o
+lcds-y$(CONFIG_FB_OMAP_LCD_H3) += lcd_h3.o
+lcds-y$(CONFIG_MACH_OMAP_PALMTE) += lcd_palmte.o
+lcds-y$(CONFIG_MACH_OMAP_PALMTT) += lcd_palmtt.o
+lcds-y$(CONFIG_MACH_OMAP_PALMZ71) += lcd_palmz71.o
+lcds-$(CONFIG_ARCH_OMAP16XX)$(CONFIG_MACH_OMAP_INNOVATOR) += lcd_inn1610.o
+lcds-$(CONFIG_ARCH_OMAP15XX)$(CONFIG_MACH_OMAP_INNOVATOR) += lcd_inn1510.o
+lcds-y$(CONFIG_MACH_OMAP_OSK) += lcd_osk.o
 
-objs-y$(CONFIG_FB_OMAP_LCD_MIPID) += lcd_mipid.o
-objs-y$(CONFIG_MACH_HERALD) += lcd_htcherald.o
+lcds-y$(CONFIG_FB_OMAP_LCD_MIPID) += lcd_mipid.o
+lcds-y$(CONFIG_MACH_HERALD) += lcd_htcherald.o
 
 omapfb-objs := $(objs-yy)
 
+obj-$(CONFIG_FB_OMAP) += $(lcds-yy)

drivers/video/fbdev/omap/omapfb_main.c

···
 	if (fbdev_pdev != NULL)
 		omapfb_do_probe(fbdev_pdev, fbdev_panel);
 }
+EXPORT_SYMBOL_GPL(omapfb_register_panel);
 
 /* Called when the device is being detached from the driver */
 static int omapfb_remove(struct platform_device *pdev)

include/linux/omap-dma.h

···
 extern int omap_dma_chain_status(int chain_id);
 #endif
 
-#if defined(CONFIG_ARCH_OMAP1) && defined(CONFIG_FB_OMAP)
+#if defined(CONFIG_ARCH_OMAP1) && IS_ENABLED(CONFIG_FB_OMAP)
 #include <mach/lcd_dma.h>
 #else
 static inline int omap_lcd_dma_running(void)