i2c: i2c-rcar: deprecate class based instantiation

Warn users that class based instantiation is going away soon in favour
of more robust probing and faster bootup times.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-rcar.c

@@ -692,7 +692,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 	adap			= &priv->adap;
 	adap->nr		= pdev->id;
 	adap->algo		= &rcar_i2c_algo;
-	adap->class		= I2C_CLASS_HWMON | I2C_CLASS_SPD;
+	adap->class		= I2C_CLASS_HWMON | I2C_CLASS_SPD | I2C_CLASS_DEPRECATED;
 	adap->retries		= 3;
 	adap->dev.parent	= dev;
 	adap->dev.of_node	= dev->of_node;