regulator: core: add callback to perform runtime init

Provide an initialisation callback to handle runtime parameters.
The idea is similar to the regulator_init() callback, but it provides
regulator specific structures, instead of just the driver specific data.

As an example, this allows the driver to amend the regulator constraints
based on runtime parameters if necessary.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patch.msgid.link/20241008-regulator-ignored-data-v2-2-d1251e0ee507@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -5758,6 +5758,12 @@ regulator_register(struct device *dev,
 		goto wash;
 	}
 
+	if (regulator_desc->init_cb) {
+		ret = regulator_desc->init_cb(rdev, config);
+		if (ret < 0)
+			goto wash;
+	}
+
 	if ((rdev->supply_name && !rdev->supply) &&
 		(rdev->constraints->always_on ||
 		 rdev->constraints->boot_on)) {

include/linux/regulator/driver.h

@@ -365,6 +365,8 @@ struct regulator_desc {
 	int (*of_parse_cb)(struct device_node *,
 			    const struct regulator_desc *,
 			    struct regulator_config *);
+	int (*init_cb)(struct regulator_dev *,
+		       struct regulator_config *);
 	int id;
 	unsigned int continuous_voltage_range:1;
 	unsigned n_voltages;