docs: i2c: reference simple probes

Instead of documenting old-style probes, reference "simple probes" and
document the i2c_match_id function. This might help reduce the use of
two-argument probes in new code.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Author: skitt

Documentation/i2c/writing-clients.rst

@@ -46,7 +46,7 @@ driver model device node, and its I2C address.
 	},
 
 	.id_table	= foo_idtable,
-	.probe		= foo_probe,
+	.probe_new	= foo_probe,
 	.remove		= foo_remove,
 	/* if device autodetection is needed: */
 	.class		= I2C_CLASS_SOMETHING,
@@ -155,8 +155,7 @@ those devices, and a remove() method to unbind.
 
 ::
 
-	static int foo_probe(struct i2c_client *client,
-			     const struct i2c_device_id *id);
+	static int foo_probe(struct i2c_client *client);
 	static int foo_remove(struct i2c_client *client);
 
 Remember that the i2c_driver does not create those client handles.  The
@@ -165,8 +164,12 @@ handle may be used during foo_probe().  If foo_probe() reports success
 foo_remove() returns.  That binding model is used by most Linux drivers.
 
 The probe function is called when an entry in the id_table name field
-matches the device's name. It is passed the entry that was matched so
-the driver knows which one in the table matched.
+matches the device's name. If the probe function needs that entry, it
+can retrieve it using
+
+::
+
+	const struct i2c_device_id *id = i2c_match_id(foo_idtable, client);
 
 
 Device Creation