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regulator: core: make regulator_register() EPROBE_DEFER aware

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Sometimes it can happen that the regulator_of_get_init_data() can't
retrieve the config due to a not probed device the regulator depends on.
Fix that by checking the return value of of_parse_cb() and return
EPROBE_DEFER in such cases.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20190917154021.14693-4-m.felsch@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marco Felsch 2019-09-17 17:40:21 +02:00 committed by Mark Brown
parent 131cb1210d
commit f8970d341e
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GPG Key ID: 24D68B725D5487D0
2 changed files with 27 additions and 5 deletions
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13
drivers/regulator/core.c
View File

@ -5053,6 +5053,19 @@ regulator_register(const struct regulator_desc *regulator_desc,
init_data = regulator_of_get_init_data(dev, regulator_desc, config,
&rdev->dev.of_node);
/*
* Sometimes not all resources are probed already so we need to take
* that into account. This happens most the time if the ena_gpiod comes
* from a gpio extender or something else.
*/
if (PTR_ERR(init_data) == -EPROBE_DEFER) {
kfree(config);
kfree(rdev);
ret = -EPROBE_DEFER;
goto rinse;
}
/*
* We need to keep track of any GPIO descriptor coming from the
* device tree until we have handled it over to the core. If the

19
drivers/regulator/of_regulator.c
View File

@ -445,11 +445,20 @@ struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
goto error;
}
if (desc->of_parse_cb && desc->of_parse_cb(child, desc, config)) {
dev_err(dev,
"driver callback failed to parse DT for regulator %pOFn\n",
child);
goto error;
if (desc->of_parse_cb) {
int ret;
ret = desc->of_parse_cb(child, desc, config);
if (ret) {
if (ret == -EPROBE_DEFER) {
of_node_put(child);
return ERR_PTR(-EPROBE_DEFER);
}
dev_err(dev,
"driver callback failed to parse DT for regulator %pOFn\n",
child);
goto error;
}
}
*node = child;