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regulator: Add regmap helper for ramp-delay setting

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Quite a few regulator ICs do support setting ramp-delay by writing a value
matching the delay to a ramp-delay register.

Provide a simple helper for table-based delay setting.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/f101f1db564cf32cb58719c77af0b00d7236bb89.1617020713.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Matti Vaittinen 2021-03-29 15:59:04 +03:00 committed by Mark Brown
parent e3baacf542
commit fb8fee9efd
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GPG key ID: 24D68B725D5487D0
2 changed files with 70 additions and 0 deletions
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65
drivers/regulator/helpers.c
View file

@ -901,3 +901,68 @@ bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
return reg1->rdev == reg2->rdev;
}
EXPORT_SYMBOL_GPL(regulator_is_equal);
static int find_closest_bigger(unsigned int target, const unsigned int *table,
unsigned int num_sel, unsigned int *sel)
{
unsigned int s, tmp, max, maxsel = 0;
bool found = false;
max = table[0];
for (s = 0; s < num_sel; s++) {
if (table[s] > max) {
max = table[s];
maxsel = s;
}
if (table[s] >= target) {
if (!found || table[s] - target < tmp - target) {
tmp = table[s];
*sel = s;
found = true;
if (tmp == target)
break;
}
}
}
if (!found) {
*sel = maxsel;
return -EINVAL;
}
return 0;
}
/**
* regulator_set_ramp_delay_regmap - set_ramp_delay() helper
*
* @rdev: regulator to operate on
*
* Regulators that use regmap for their register I/O can set the ramp_reg
* and ramp_mask fields in their descriptor and then use this as their
* set_ramp_delay operation, saving some code.
*/
int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay)
{
int ret;
unsigned int sel;
if (!rdev->desc->n_ramp_values)
return -EINVAL;
ret = find_closest_bigger(ramp_delay, rdev->desc->ramp_delay_table,
rdev->desc->n_ramp_values, &sel);
if (ret) {
dev_warn(rdev_get_dev(rdev),
"Can't set ramp-delay %u, setting %u\n", ramp_delay,
rdev->desc->ramp_delay_table[sel]);
}
sel <<= ffs(rdev->desc->ramp_mask) - 1;
return regmap_update_bits(rdev->regmap, rdev->desc->ramp_reg,
rdev->desc->ramp_mask, sel);
}
EXPORT_SYMBOL_GPL(regulator_set_ramp_delay_regmap);

5
include/linux/regulator/driver.h
View file

@ -373,6 +373,10 @@ struct regulator_desc {
unsigned int pull_down_reg;
unsigned int pull_down_mask;
unsigned int pull_down_val_on;
unsigned int ramp_reg;
unsigned int ramp_mask;
const unsigned int *ramp_delay_table;
unsigned int n_ramp_values;
unsigned int enable_time;
@ -535,6 +539,7 @@ int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
int min_uA, int max_uA);
int regulator_get_current_limit_regmap(struct regulator_dev *rdev);
void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay);
/*
* Helper functions intended to be used by regulator drivers prior registering