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Subject[RFC PATCH v1 2/3] regulator: add regulator_desc_list_voltage_linear_range
Add regulator_desc_list_voltage_linear_range which can be used
by drivers for getting the voltages before regulator is registered.
This may be useful for drivers which need to fetch the voltage
selectors at device-tree parsing callback.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---

Please not apply as such. This is compile-tested only and sent
for collecting feedback. If idea is Ok I will do proper testing
and send a non RFC patch.

drivers/regulator/helpers.c | 39 +++++++++++++++++++++++++++++----------
include/linux/regulator/driver.h | 6 ++++++
2 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index 5686a1335bd3..68ac6017ef28 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -594,28 +594,30 @@ int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);

/**
- * regulator_list_voltage_linear_range - List voltages for linear ranges
+ * regulator_desc_list_voltage_linear_range - List voltages for linear ranges
*
- * @rdev: Regulator device
+ * @desc: Regulator desc for regulator which volatges are to be listed
* @selector: Selector to convert into a voltage
*
* Regulators with a series of simple linear mappings between voltages
- * and selectors can set linear_ranges in the regulator descriptor and
- * then use this function as their list_voltage() operation,
+ * and selectors who have set linear_ranges in the regulator descriptor
+ * can use this function prior regulator registration to list voltages.
+ * This is useful when voltages need to be listed during device-tree
+ * parsing.
*/
-int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
- unsigned int selector)
+int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
+ unsigned int selector)
{
const struct regulator_linear_range *range;
int i;

- if (!rdev->desc->n_linear_ranges) {
- BUG_ON(!rdev->desc->n_linear_ranges);
+ if (!desc->n_linear_ranges) {
+ BUG_ON(!desc->n_linear_ranges);
return -EINVAL;
}

- for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
- range = &rdev->desc->linear_ranges[i];
+ for (i = 0; i < desc->n_linear_ranges; i++) {
+ range = &desc->linear_ranges[i];

if (!(selector >= range->min_sel &&
selector <= range->max_sel))
@@ -628,6 +630,23 @@ int regulator_list_voltage_linear_range(struct regulator_dev *rdev,

return -EINVAL;
}
+EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);
+
+/**
+ * regulator_list_voltage_linear_range - List voltages for linear ranges
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a series of simple linear mappings between voltages
+ * and selectors can set linear_ranges in the regulator descriptor and
+ * then use this function as their list_voltage() operation,
+ */
+int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
+}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);

/**
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 7f8345bff4e1..05efe2b057c1 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -539,4 +539,10 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
void regulator_lock(struct regulator_dev *rdev);
void regulator_unlock(struct regulator_dev *rdev);

+/*
+ * Helper functions intended to be used by regulator drivers prior registering
+ * their regulators.
+ */
+int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
+ unsigned int selector);
#endif
--
2.14.3

--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then, he vanished ~~~

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