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Subject[PATCH RFC/RFT 1/7] regulator: core: Allow drivers to set voltage mapping table in regulator_desc
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Some regulator hardware use table based mapping can set volt_table in
regulator_desc and use regulator_list_voltage_table() for their list_voltage
callback.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
drivers/regulator/core.c | 25 +++++++++++++++++++++++++
include/linux/regulator/driver.h | 5 +++++
2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index faa0532..0b15587 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1880,6 +1880,31 @@ int regulator_list_voltage_linear(struct regulator_dev *rdev,
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);

/**
+ * regulator_list_voltage_table - List voltages with table based mapping
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with table based mapping between voltages and
+ * selectors can set volt_table in the regulator descriptor
+ * and then use this function as their list_voltage() operation.
+ */
+int regulator_list_voltage_table(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ if (!rdev->desc->volt_table) {
+ BUG_ON(!rdev->desc->volt_table);
+ return -EINVAL;
+ }
+
+ if (selector >= rdev->desc->n_voltages)
+ return -EINVAL;
+
+ return rdev->desc->volt_table[selector];
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
+
+/**
* regulator_list_voltage - enumerate supported voltages
* @regulator: regulator source
* @selector: identify voltage to list
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index b0432cc..8022638 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -170,6 +170,7 @@ enum regulator_type {
*
* @min_uV: Voltage given by the lowest selector (if linear mapping)
* @uV_step: Voltage increase with each selector (if linear mapping)
+ * @volt_table: Voltage mapping table (if table based mapping)
*
* @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
* @vsel_mask: Mask for register bitfield used for selector
@@ -189,6 +190,8 @@ struct regulator_desc {
unsigned int min_uV;
unsigned int uV_step;

+ const unsigned int *volt_table;
+
unsigned int vsel_reg;
unsigned int vsel_mask;
unsigned int enable_reg;
@@ -271,6 +274,8 @@ int regulator_mode_to_status(unsigned int);

int regulator_list_voltage_linear(struct regulator_dev *rdev,
unsigned int selector);
+int regulator_list_voltage_table(struct regulator_dev *rdev,
+ unsigned int selector);
int regulator_map_voltage_linear(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
--
1.7.5.4




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