drm/panel: Add Ilitek ILI9322 driver

This adds support for the Ilitek ILI9322 QVGA (320x240)
TFT panel driver.

This panel driver supports serial or parallel RGB or
YUV input and also ITU-T BT.656 input streams.

The controller is combined with a physical panel and
configured through the device tree.

Cc: David Lechner <david@lechnology.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171221234411.12156-1-linus.walleij@linaro.org

drivers/gpu/drm/panel/Kconfig

@@ -28,6 +28,14 @@ config DRM_PANEL_SIMPLE
 	  that it can be automatically turned off when the panel goes into a
 	  low power state.
 
+config DRM_PANEL_ILITEK_IL9322
+	tristate "Ilitek ILI9322 320x240 QVGA panels"
+	depends on OF && SPI
+	select REGMAP
+	help
+	  Say Y here if you want to enable support for Ilitek IL9322
+	  QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
+
 config DRM_PANEL_INNOLUX_P079ZCA
 	tristate "Innolux P079ZCA panel"
 	depends on OF

drivers/gpu/drm/panel/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
 obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o