drivers: video: emul_rx: Explicitly set init priority

The Emul Rx needs to be initialized after the camera sensor which
is generally initialized with CONFIG_VIDEO_INIT_PRIORITY.

This is currently true "by chance" due to the order the linker links the
object files. This linker order is not easily controlled, so use an
explicit priority value to ensure this requirement.

Signed-off-by: Phi Bang Nguyen <[email protected]>

Author: ngphibang

drivers/video/Kconfig.emul_rx

@@ -8,3 +8,10 @@ config VIDEO_EMUL_RX
 	default y
 	help
 	  Enable driver for the MIPI RX emulated DMA engine.
+
+config VIDEO_EMUL_RX_INIT_PRIORITY
+	int "Emul Rx init priority"
+	default 61
+	depends on VIDEO_EMUL_RX
+	help
+	  Initialization priority for the EMUL Rx device.

drivers/video/video_emul_rx.c

@@ -235,7 +235,8 @@ int emul_rx_init(const struct device *dev)
 	};                                                                                         \
                                                                                                    \
 	DEVICE_DT_INST_DEFINE(n, &emul_rx_init, NULL, &emul_rx_data_##n, &emul_rx_cfg_##n,         \
-			      POST_KERNEL, CONFIG_VIDEO_INIT_PRIORITY, &emul_rx_driver_api);       \
+			      POST_KERNEL, CONFIG_VIDEO_EMUL_RX_INIT_PRIORITY,                     \
+			      &emul_rx_driver_api);                                                \
                                                                                                    \
 	VIDEO_DEVICE_DEFINE(emul_rx_##n, DEVICE_DT_INST_GET(n), SOURCE_DEV(n));