drm/tinydrm: add driver for ILI9225 panels

This adds a new driver for display panels based on the Ilitek ILI9225
controller.

This was developed for a no-name panel with a red PCB that is commonly
marketed for Arduino. See <https://github.com/Nkawu/TFT_22_ILI9225>.
Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1511122328-31133-5-git-send-email-david@lechnology.com

MAINTAINERS

@@ -4370,6 +4370,12 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 S:	Maintained
 F:	drivers/gpu/drm/tve200/
 
+DRM DRIVER FOR ILITEK ILI9225 PANELS
+M:	David Lechner <david@lechnology.com>
+S:	Maintained
+F:	drivers/gpu/drm/tinydrm/ili9225.c
+F:	Documentation/devicetree/bindings/display/ili9225.txt
+
 DRM DRIVER FOR INTEL I810 VIDEO CARDS
 S:	Orphan / Obsolete
 F:	drivers/gpu/drm/i810/

drivers/gpu/drm/tinydrm/Kconfig

@@ -12,6 +12,16 @@ menuconfig DRM_TINYDRM
 config TINYDRM_MIPI_DBI
 	tristate
 
+config TINYDRM_ILI9225
+	tristate "DRM support for ILI9225 display panels"
+	depends on DRM_TINYDRM && SPI
+	select TINYDRM_MIPI_DBI
+	help
+	  DRM driver for the following Ilitek ILI9225 panels:
+	  * No-name 2.2" color screen module
+
+	  If M is selected the module will be called ili9225.
+
 config TINYDRM_MI0283QT
 	tristate "DRM support for MI0283QT"
 	depends on DRM_TINYDRM && SPI

drivers/gpu/drm/tinydrm/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_TINYDRM)		+= core/
 obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o
 
 # Displays
+obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o
 obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
 obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o
 obj-$(CONFIG_TINYDRM_ST7586)		+= st7586.o