fbdev: add ls2k500sfb driver for ls2k500 bmc.

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I76XQZ

--------------------------------
Signed-off-by: NChong Qiao <qiaochong@loongson.cn>
Signed-off-by: NHongchen Zhang <zhanghongchen@loongson.cn>
Change-Id: I27625d42835aac13bdff68f63f8ce2b824723b73

drivers/video/fbdev/Kconfig

@@ -2236,6 +2236,15 @@ config FB_SM712
 	  called sm712fb. If you want to compile it as a module, say M
 	  here and read <file:Documentation/kbuild/modules.rst>.
 
+config FB_LS2K500
+	tristate "Loongson LS2K500 frame buffer support"
+	depends on FB && PCI
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	help
+	  Frame buffer driver for the Loongson LS7A Platform-Bridge.
+
 source "drivers/video/fbdev/omap/Kconfig"
 source "drivers/video/fbdev/omap2/Kconfig"
 source "drivers/video/fbdev/mmp/Kconfig"

drivers/video/fbdev/Makefile

@@ -132,3 +132,4 @@ obj-$(CONFIG_FB_SIMPLE)           += simplefb.o
 
 # the test framebuffer is last
 obj-$(CONFIG_FB_VIRTUAL)          += vfb.o
+obj-$(CONFIG_FB_LS2K500) += ls2k500sfb.o