diff options
| author | Pantelis Antoniou <pantelis.antoniou@konsulko.com> | 2015-01-15 18:33:55 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-02-20 23:41:31 +0900 |
| commit | a45e4e42eed3e70da7adc867a881af80d6fd6cc5 (patch) | |
| tree | c9f11b3105762d5ab41f66cad062e65595e7ab3d | |
| parent | e389b9aee729de629f17cfa10ec9ae193dc99d54 (diff) | |
i2c: Mark instantiated device nodes with OF_POPULATE
Mark (and unmark) device nodes with the POPULATE flag as appropriate.
This is required to avoid multi probing when using I2C and device
overlays containing a mux.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit d5285c36e6d27c1a411a3131c034641a5fa452cb)
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/i2c/i2c-core.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index e2e484567df2..7ac0a84a2e89 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -723,6 +723,8 @@ EXPORT_SYMBOL_GPL(i2c_new_device); */ void i2c_unregister_device(struct i2c_client *client) { + if (client->dev.of_node) + of_node_clear_flag(client->dev.of_node, OF_POPULATED); device_unregister(&client->dev); } EXPORT_SYMBOL_GPL(i2c_unregister_device); @@ -1044,8 +1046,11 @@ static void of_i2c_register_devices(struct i2c_adapter *adap) dev_dbg(&adap->dev, "of_i2c: walking child nodes\n"); - for_each_available_child_of_node(adap->dev.of_node, node) + for_each_available_child_of_node(adap->dev.of_node, node) { + if (of_node_test_and_set_flag(node, OF_POPULATED)) + continue; of_i2c_register_device(adap, node); + } } static int of_dev_node_match(struct device *dev, void *data) @@ -1672,6 +1677,11 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action, if (adap == NULL) return NOTIFY_OK; /* not for us */ + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { + put_device(&adap->dev); + return NOTIFY_OK; + } + client = of_i2c_register_device(adap, rd->dn); put_device(&adap->dev); @@ -1682,6 +1692,10 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action, } break; case OF_RECONFIG_CHANGE_REMOVE: + /* already depopulated? */ + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + /* find our device by node */ client = of_find_i2c_device_by_node(rd->dn); if (client == NULL) |