1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 4ccff114b147..a1eeb8a5d3f8 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1915,6 +1915,16 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
 	if (!driver->detect || !address_list)
 		return 0;
 
+	/* Warn that the adapter lost class based instantiation */
+	if (adapter->class == I2C_CLASS_DEPRECATED) {
+		dev_dbg(&adapter->dev,
+			"This adapter dropped support for I2C classes and "
+			"won't auto-detect %s devices anymore. If you need it, check "
+			"'Documentation/i2c/instantiating-devices' for alternatives.\n",
+			driver->driver.name);
+		return 0;
+	}
+
 	/* Stop here if the classes do not match */
 	if (!(adapter->class & driver->class))
 		return 0;