drm/panel: Add panel driver for Ilitek ILI9806E panel

The Ilitek ILI9806E driver is used in the Pimoroni HyperPixel4
and potentially other displays. Whilst it can support multiple
interfaces, this driver only accounts for SPI configuration and
DPI video data.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Author: 6by9

drivers/gpu/drm/panel/Kconfig

@@ -223,6 +223,17 @@ config DRM_PANEL_ILITEK_ILI9806E
 	  Say Y if you want to enable support for panels based on the
 	  Ilitek ILI9806E controller.
 
+config DRM_PANEL_ILITEK_ILI9806E_SPI
+	tristate "Ilitek ILI9806E-based panels on SPI/DPI"
+	depends on OF && SPI
+	select DRM_KMS_HELPER
+	depends on BACKLIGHT_CLASS_DEVICE
+	select DRM_MIPI_DBI
+	help
+	  Say Y if you want to enable support for panels based on the
+	  Ilitek ILI9806e controller using DPI for video and SPI for
+	  configuration.
+
 config DRM_PANEL_ILITEK_ILI9881C
 	tristate "Ilitek ILI9881C-based panels"
 	depends on OF

drivers/gpu/drm/panel/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9341) += panel-ilitek-ili9341.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9805) += panel-ilitek-ili9805.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9806E) += panel-ilitek-ili9806e.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9806E_SPI) += panel-ilitek-ili9806e-spi.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9882T) += panel-ilitek-ili9882t.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_EJ030NA) += panel-innolux-ej030na.o