drm: bridge: Move exynos_drm_dsi into bridges

The MIPI DSI IP used in Exynos and i.MX8MM are based
Samsung MIPI DSIM bridge.
   
In order to access the common bridge between platforms
the ideal way to push the driver into the bridge area.
   
So, this patch will move the exynos_drm_dsi.c driver
into samsung-dsim.c and do the necessary function name
changes.
   
This would help to improve the bridge driver in future
patches in order to make use of different SoC families
and platforms.

The bridge now support two implementations,

A. With component_ops and exynos specific code exclusively
   for exynos dsi drivers and it's legacy bindings.

B. Without componenet_ops for newly implemented bridges
   and its users like i.MX8MM.

The future plan is to fix the implementation A) by dropping
component_ops and fixing exynos specific code in order to
make the bridge more mature to use.

Updated MAINTAINERS file for this bridge with exynos drm
maintainers along with Andrzej as he is the original author.

Tomasz Figa has been not included in MAINTAINERS as he is
not available via samsung.com.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

MAINTAINERS

@@ -5872,6 +5872,17 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/panel/samsung,lms397kf04.yaml
 F:	drivers/gpu/drm/panel/panel-samsung-db7430.c
 
+DRM DRIVER FOR SAMSUNG MIPI DSIM BRIDGE
+M:	Inki Dae <inki.dae@samsung.com>
+M:	Joonyoung Shim <jy0922.shim@samsung.com>
+M:	Seung-Woo Kim <sw0312.kim@samsung.com>
+M:	Kyungmin Park <kyungmin.park@samsung.com>
+M:	Andrzej Hajda <a.hajda@samsung.com>
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	drivers/gpu/drm/bridge/samsung-dsim.c
+
 DRM DRIVER FOR SITRONIX ST7703 PANELS
 M:	Guido Günther <agx@sigxcpu.org>
 R:	Purism Kernel Team <kernel@puri.sm>

drivers/gpu/drm/bridge/Kconfig

@@ -190,6 +190,21 @@ config DRM_PARADE_PS8640
 	  The PS8640 is a high-performance and low-power
 	  MIPI DSI to eDP converter
 
+config DRM_SAMSUNG_DSIM
+	tristate "Samsung MIPI DSIM bridge driver"
+	depends on DRM
+	depends on COMMON_CLK
+	depends on OF && HAS_IOMEM
+	depends on DRM_EXYNOS_FIMD || DRM_EXYNOS5433_DECON || DRM_EXYNOS7_DECON
+	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
+	select DRM_PANEL_BRIDGE
+	select REGMAP_MMIO
+	help
+	  This enables the Samsung MIPI DSIM bridge controller driver.
+	  This MIPI DSIM bridge can be found it on Exynos and NXP's
+	  i.MX8M Mini and Nano SoC's.
+
 config DRM_SIL_SII8620
 	tristate "Silicon Image SII8620 HDMI/MHL bridge"
 	depends on OF

drivers/gpu/drm/bridge/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
 obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
 obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
+obj-$(CONFIG_DRM_SAMSUNG_DSIM) += samsung-dsim.o
 obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
 obj-$(CONFIG_DRM_SII902X) += sii902x.o
 obj-$(CONFIG_DRM_SII9234) += sii9234.o