mira220: overlay: add readme for overlay

Author: fiepfiep

arch/arm/boot/dts/overlays/Makefile

@@ -132,7 +132,6 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	i2s-gpio28-31.dtbo \
 	i2s-master-dac.dtbo \
 	ilitek251x.dtbo \
-	mira220.dtbo \
 	imx219.dtbo \
 	imx258.dtbo \
 	imx290.dtbo \
@@ -187,6 +186,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	minipitft13.dtbo \
 	miniuart-bt.dtbo \
 	mipi-dbi-spi.dtbo \
+	mira220.dtbo \
 	mlx90640.dtbo \
 	mmc.dtbo \
 	mz61581.dtbo \

arch/arm/boot/dts/overlays/README

@@ -3630,6 +3630,20 @@ Params: rotation                Mounting rotation of the camera sensor (0 or
         clk-continuous          Switch to continuous mode on the CSI clock lane,
                                 which increases the maximum frame rate slightly.
                                 Appears not to work on Pi3.
+Name:   mira220
+Info:   ams mira220 camera module.
+        Uses Unicam 1, which is the standard camera connector on most Pi
+        variants.
+Load:   dtoverlay=mira220,<param>=<val>
+Params: rotation                Mounting rotation of the camera sensor (0 or
+                                180, default 0)
+        orientation             Sensor orientation (0 = front, 1 = rear,
+                                2 = external, default external)
+        media-controller        Configure use of Media Controller API for
+                                configuring the sensor (default on)
+        cam0                    Adopt the default configuration for CAM0 on a
+                                Compute Module (CSI0, i2c_vc, and cam0_reg).
+
 
 
 Name:   papirus