rockchip: ringneck-px30: enable DT overlay support

Haikou carrierboard allows multiple adapter boards to be connected, for
now there exists the following adapter boards compatible with PX30
Ringneck:
 - Haikou Video Demo on the Video Connector,
 - Haikou LVDS 9904379 on the Video Connector,

So support DT overlays so we can use this mechanism instead of full DTB
containing both the carrierboard and the adapter.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/configs/ringneck-px30_defconfig b/configs/ringneck-px30_defconfig
index 324581b..b6b3d3e 100644 (file)
--- a/configs/ringneck-px30_defconfig
+++ b/configs/ringneck-px30_defconfig
@@ -5,6 +5,7 @@ CONFIG_ARCH_ROCKCHIP=y
 CONFIG_SPL_GPIO=y
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_DEFAULT_DEVICE_TREE="rockchip/px30-ringneck-haikou"
+CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_PX30=y
 # CONFIG_TPL_ROCKCHIP_COMMON_BOARD is not set