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regulator: core: Allow drivers to set simple linear voltage maps as data
A lot of regulator hardware maps selectors on to voltages with a simple linear mapping function selector = base + (selector * step size) Provide off the shelf list_voltage() and map_voltage() operations which use new min_uV and uV_step members in the regulator_desc to implement this function. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@ti.com>
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e843fc4616
commit
bca7bbfff3
2 changed files with 66 additions and 2 deletions
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@ -1859,6 +1859,26 @@ int regulator_count_voltages(struct regulator *regulator)
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}
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EXPORT_SYMBOL_GPL(regulator_count_voltages);
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/**
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* regulator_list_voltage_linear - List voltages with simple calculation
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*
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* @rdev: Regulator device
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* @selector: Selector to convert into a voltage
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*
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* Regulators with a simple linear mapping between voltages and
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* selectors can set min_uV and uV_step in the regulator descriptor
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* and then use this function as their list_voltage() operation,
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*/
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int regulator_list_voltage_linear(struct regulator_dev *rdev,
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unsigned int selector)
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{
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if (selector >= rdev->desc->n_voltages)
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return -EINVAL;
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return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
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}
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EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
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/**
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* regulator_list_voltage - enumerate supported voltages
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* @regulator: regulator source
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@ -2007,6 +2027,39 @@ int regulator_map_voltage_iterate(struct regulator_dev *rdev,
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}
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EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
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/**
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* regulator_map_voltage_linear - map_voltage() for simple linear mappings
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*
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* @rdev: Regulator to operate on
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* @min_uV: Lower bound for voltage
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* @max_uV: Upper bound for voltage
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*
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* Drivers providing min_uV and uV_step in their regulator_desc can
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* use this as their map_voltage() operation.
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*/
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int regulator_map_voltage_linear(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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int ret, voltage;
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if (!rdev->desc->uV_step) {
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BUG_ON(!rdev->desc->uV_step);
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return -EINVAL;
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}
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ret = (min_uV - rdev->desc->min_uV) / rdev->desc->uV_step;
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if (ret < 0)
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return ret;
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/* Map back into a voltage to verify we're still in bounds */
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voltage = rdev->desc->ops->list_voltage(rdev, ret);
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if (voltage < min_uV || voltage > max_uV)
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return -EINVAL;
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return ret;
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}
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EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
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static int _regulator_do_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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@ -161,12 +161,16 @@ enum regulator_type {
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* @name: Identifying name for the regulator.
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* @supply_name: Identifying the regulator supply
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* @id: Numerical identifier for the regulator.
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* @n_voltages: Number of selectors available for ops.list_voltage().
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* @ops: Regulator operations table.
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* @irq: Interrupt number for the regulator.
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* @type: Indicates if the regulator is a voltage or current regulator.
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* @owner: Module providing the regulator, used for refcounting.
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*
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* @n_voltages: Number of selectors available for ops.list_voltage().
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*
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* @min_uV: Voltage given by the lowest selector (if linear mapping)
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* @uV_step: Voltage increase with each selector (if linear mapping)
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*
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* @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
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* @vsel_mask: Mask for register bitfield used for selector
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* @enable_reg: Register for control when using regmap enable/disable ops
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@ -182,6 +186,9 @@ struct regulator_desc {
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enum regulator_type type;
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struct module *owner;
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unsigned int min_uV;
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unsigned int uV_step;
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unsigned int vsel_reg;
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unsigned int vsel_mask;
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unsigned int enable_reg;
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@ -262,6 +269,10 @@ int rdev_get_id(struct regulator_dev *rdev);
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int regulator_mode_to_status(unsigned int);
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int regulator_list_voltage_linear(struct regulator_dev *rdev,
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unsigned int selector);
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int regulator_map_voltage_linear(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_map_voltage_iterate(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
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