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drivers: pca9420: Added voltage level support for PCA9420

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This commit adds support for editing the voltage levels on the buck
regulators on the PCA9420 PMIC

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2021-09-24 17:11:54 -05:00 • committed by Christopher Friedt
commit 423dff8a51
2 changed files with 73 additions and 4 deletions
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75
drivers/regulator/regulator_pmic.c
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@ -66,6 +66,8 @@ static int regulator_modify_register(const struct regulator_config *conf,
}
reg_current &= ~reg_mask;
reg_current |= reg_val;
LOG_DBG("Writing 0x%02X to reg 0x%02X at I2C addr 0x%02X",
reg_current, reg, conf->i2c_address);
return i2c_reg_write_byte(conf->i2c_dev, conf->i2c_address, reg,
reg_current);
}
@ -94,6 +96,10 @@ int regulator_list_voltages(const struct device *dev, unsigned int selector)
return config->voltages[selector].uV;
}
/**
* Part of the extended regulator consumer API
* Returns true if the regulator supports a voltage in the given range.
*/
int regulator_is_supported_voltage(const struct device *dev,
int min_uV, int max_uV)
{
@ -102,6 +108,70 @@ int regulator_is_supported_voltage(const struct device *dev,
return !((config->max_uV < min_uV) || (config->min_uV > max_uV));
}
/**
* Part of the extended regulator consumer API
* Sets the output voltage to the closest supported voltage value
*/
int regulator_set_voltage(const struct device *dev, int min_uV, int max_uV)
{
const struct regulator_config *config = dev->config;
int i = 0;
if (!regulator_is_supported_voltage(dev, min_uV, max_uV) ||
min_uV > max_uV) {
return -EINVAL;
}
/* Find closest supported voltage */
while (min_uV > config->voltages[i].uV && i < config->num_voltages) {
i++;
}
if (config->voltages[i].uV > max_uV) {
LOG_DBG("Regulator could not satisfy voltage range, too narrow");
return -EINVAL;
}
if (i == config->num_voltages) {
LOG_WRN("Regulator could not locate supported voltage,"
"but voltage is in range.");
return -EINVAL;
}
LOG_DBG("Setting regulator %s to %duV", dev->name,
config->voltages[i].uV);
return regulator_modify_register(config, config->vsel_reg,
config->vsel_mask, config->voltages[i].reg_val);
}
/**
* Part of the extended regulator consumer API
* Gets the current output voltage in uV
*/
int regulator_get_voltage(const struct device *dev)
{
const struct regulator_config *config = dev->config;
int rc, i = 0;
uint8_t raw_reg;
rc = i2c_reg_read_byte(config->i2c_dev, config->i2c_address,
config->vsel_reg, &raw_reg);
if (rc) {
return rc;
}
raw_reg &= config->vsel_mask;
/* Locate the voltage value in the voltage table */
while (raw_reg != config->voltages[i].reg_val &&
i < config->num_voltages){
i++;
}
if (i == config->num_voltages) {
LOG_WRN("Regulator vsel reg has unknown value");
return -EIO;
}
return config->voltages[i].uV;
}
static int enable_regulator(const struct device *dev, struct onoff_client *cli)
@ -120,7 +190,7 @@ static int enable_regulator(const struct device *dev, struct onoff_client *cli)
}
en_val = config->enable_inverted ? 0 : config->enable_val;
rc = regulator_modify_register(config, config->enable_reg,
config->enable_reg, en_val);
config->enable_mask, en_val);
if (rc) {
return onoff_sync_finalize(&data->srv, key, NULL, rc, false);
}
@ -143,7 +213,7 @@ static int disable_regulator(const struct device *dev)
}
dis_val = config->enable_inverted ? config->enable_val : 0;
rc = regulator_modify_register(config, config->enable_reg,
config->enable_reg, dis_val);
config->enable_mask, dis_val);
if (rc) {
/* Error writing configs */
return onoff_sync_finalize(&data->srv, key, NULL, rc, true);
@ -155,7 +225,6 @@ static int pmic_reg_init(const struct device *dev)
{
struct regulator_config *config = (struct regulator_config *)dev->config;
LOG_INF("PMIC regulator initializing");
/* Cast the voltage array set at compile time to the voltage range
* struct
*/