Document new compatible devices.
Cc: devicetree@vger.kernel.org
Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
 
 Required Properties:
 
-  - compatible: Must contain "adi,ad5820"
+  - compatible: Must contain one of:
+               - "adi,ad5820"
+               - "adi,ad5821"
+               - "adi,ad5823"
 
   - reg: I2C slave address