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drivers: sensor: npm1300_charger: die temp threshold configuration

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Added configuration of die temperature stop/resume thresholds

Signed-off-by: Andy Sinclair <andy.sinclair@nordicsemi.no>
This commit is contained in:
Andy Sinclair 2023-10-09 10:33:59 +01:00 committed by Fabio Baltieri
parent 93a8ec4b5d
commit 8fd676295e
2 changed files with 55 additions and 1 deletions
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44
drivers/sensor/npm1300_charger/npm1300_charger.c
View file

@ -20,6 +20,7 @@ struct npm1300_charger_config {
int32_t dischg_limit_microamp;
int32_t vbus_limit_microamp;
int32_t temp_thresholds[4U];
int32_t dietemp_thresholds[2U];
uint32_t thermistor_ohms;
uint16_t thermistor_beta;
uint8_t thermistor_idx;
@ -57,6 +58,7 @@ struct npm1300_charger_data {
#define CHGR_OFFSET_TRICKLE_SEL 0x0EU
#define CHGR_OFFSET_ITERM_SEL 0x0FU
#define CHGR_OFFSET_NTC_TEMPS 0x10U
#define CHGR_OFFSET_DIE_TEMPS 0x18U
#define CHGR_OFFSET_CHG_STAT 0x34U
#define CHGR_OFFSET_ERR_REASON 0x36U
#define CHGR_OFFSET_VBATLOW_EN 0x50U
@ -108,11 +110,20 @@ struct adc_results_t {
#define NTCTEMP_MSB_SHIFT 2U
#define NTCTEMP_LSB_MASK 0x03U
/* dietemp masks */
#define DIETEMP_MSB_SHIFT 2U
#define DIETEMP_LSB_MASK 0x03U
/* VBUS masks */
#define DETECT_HI_MASK 0x0AU
#define DETECT_HI_CURRENT 1500000
#define DETECT_LO_CURRENT 500000
/* Dietemp calculation constants */
#define DIETEMP_OFFSET_MDEGC 394670
#define DIETEMP_FACTOR_MUL 3963000
#define DIETEMP_FACTOR_DIV 5000
/* Linear range for charger terminal voltage */
static const struct linear_range charger_volt_ranges[] = {
LINEAR_RANGE_INIT(3500000, 50000, 0U, 3U), LINEAR_RANGE_INIT(4000000, 50000, 4U, 13U)};
@ -299,6 +310,29 @@ static int set_ntc_thresholds(const struct npm1300_charger_config *const config)
return 0;
}
static int set_dietemp_thresholds(const struct npm1300_charger_config *const config)
{
for (uint8_t idx = 0U; idx < 2U; idx++) {
if (config->dietemp_thresholds[idx] < INT32_MAX) {
/* Ref: Datasheet section 6.2.6: Charger thermal regulation */
int32_t numerator =
(DIETEMP_OFFSET_MDEGC - config->dietemp_thresholds[idx]) *
DIETEMP_FACTOR_DIV;
uint16_t code = DIV_ROUND_CLOSEST(numerator, DIETEMP_FACTOR_MUL);
int ret = mfd_npm1300_reg_write2(
config->mfd, CHGR_BASE, CHGR_OFFSET_DIE_TEMPS + (idx * 2U),
code >> DIETEMP_MSB_SHIFT, code & DIETEMP_LSB_MASK);
if (ret != 0) {
return ret;
}
}
}
return 0;
}
static int npm1300_charger_attr_get(const struct device *dev, enum sensor_channel chan,
enum sensor_attribute attr, struct sensor_value *val)
{
@ -410,7 +444,7 @@ int npm1300_charger_init(const struct device *dev)
return -ENODEV;
}
/* Configure thermistor */
/* Configure temperature thresholds */
ret = mfd_npm1300_reg_write(config->mfd, ADC_BASE, ADC_OFFSET_NTCR_SEL,
config->thermistor_idx + 1U);
if (ret != 0) {
@ -422,6 +456,11 @@ int npm1300_charger_init(const struct device *dev)
return ret;
}
ret = set_dietemp_thresholds(config);
if (ret != 0) {
return ret;
}
/* Configure termination voltages */
ret = linear_range_group_get_win_index(charger_volt_ranges, ARRAY_SIZE(charger_volt_ranges),
config->term_microvolt, config->term_microvolt,
@ -576,6 +615,9 @@ static const struct sensor_driver_api npm1300_charger_battery_driver_api = {
.iterm_sel = DT_INST_ENUM_IDX(n, term_current_percent), \
.vbatlow_charge_enable = DT_INST_PROP(n, vbatlow_charge_enable), \
.disable_recharge = DT_INST_PROP(n, disable_recharge), \
.dietemp_thresholds = {DT_INST_PROP_OR(n, dietemp_stop_millidegrees, INT32_MAX), \
DT_INST_PROP_OR(n, dietemp_resume_millidegrees, \
INT32_MAX)}, \
.temp_thresholds = {DT_INST_PROP_OR(n, thermistor_cold_millidegrees, INT32_MAX), \
DT_INST_PROP_OR(n, thermistor_cool_millidegrees, INT32_MAX), \
DT_INST_PROP_OR(n, thermistor_warm_millidegrees, INT32_MAX), \

12
dts/bindings/sensor/nordic,npm1300-charger.yaml
View file

@ -114,3 +114,15 @@ properties:
type: boolean
description: |
Disable automatic recharge.
dietemp-stop-millidegrees:
type: int
description: |
Die temperature halt threshold in milli-degrees.
When die temperature exceeds this threshold, charging will be inhibited.
dietemp-resume-millidegrees:
type: int
description: |
Die temperature resume threshold in milli-degrees.
When die temperature falls below this threshold, charging will be permitted.