#define CTRL_EN_BIT 0 /* Regulator enable bit, active high */ #define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */ #define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */ #define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */
#define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */
/** * struct tps65090_regulator - Per-regulator data for a tps65090 regulator * * @dev: Pointer to our device. * @desc: The struct regulator_desc for the regulator. * @rdev: The struct regulator_dev for the regulator. * @overcurrent_wait_valid: True if overcurrent_wait is valid. * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
*/
/** * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait * * This will set the overcurrent wait time based on what's in the regulator * info. * * @ri: Overall regulator data * @rdev: Regulator device * * Return: 0 if no error, non-zero if there was an error writing the register.
*/ staticint tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri, struct regulator_dev *rdev)
{ int ret;
/** * tps65090_try_enable_fet - Try to enable a FET * * @rdev: Regulator device * * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get * set, or some other -ve value if another error occurred (e.g. i2c error)
*/ staticint tps65090_try_enable_fet(struct regulator_dev *rdev)
{ unsignedint control; int ret, i;
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask); if (ret < 0) {
dev_err(&rdev->dev, "Error in updating reg %#x\n",
rdev->desc->enable_reg); return ret;
}
for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
&control); if (ret < 0) return ret;
if (!(control & BIT(CTRL_TO_BIT))) break;
usleep_range(1000, 1500);
} if (!(control & BIT(CTRL_PG_BIT))) return -ENOTRECOVERABLE;
return 0;
}
/** * tps65090_fet_enable - Enable a FET, trying a few times if it fails * * Some versions of the tps65090 have issues when turning on the FETs. * This function goes through several steps to ensure the best chance of the * FET going on. Specifically: * - We'll make sure that we bump the "overcurrent wait" to the maximum, which * increases the chances that we'll turn on properly. * - We'll retry turning the FET on multiple times (turning off in between). * * @rdev: Regulator device * * Return: 0 if ok, non-zero if it fails.
*/ staticint tps65090_fet_enable(struct regulator_dev *rdev)
{ int ret, tries;
/* * Try enabling multiple times until we succeed since sometimes the * first try times out.
*/
tries = 0; while (true) {
ret = tps65090_try_enable_fet(rdev); if (!ret) break; if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES) goto err;
/* Try turning the FET off (and then on again) */
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, 0); if (ret) goto err;
tries++;
}
if (tries)
dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
rdev->desc->enable_reg, tries);
/* * First enable output for internal control if require. * And then disable external control.
*/ if (tps_pdata->reg_init_data->constraints.always_on ||
tps_pdata->reg_init_data->constraints.boot_on) {
ret = tps65090_set_bits(parent, reg_en_reg, 0); if (ret < 0) {
dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg); return ret;
}
} return tps65090_config_ext_control(ri, false);
}
tps65090_pdata = dev_get_platdata(pdev->dev.parent); if (!tps65090_pdata && tps65090_mfd->dev->of_node)
tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
&tps65090_reg_matches); if (IS_ERR_OR_NULL(tps65090_pdata)) {
dev_err(&pdev->dev, "Platform data missing\n"); return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
}
pmic = devm_kcalloc(&pdev->dev,
TPS65090_REGULATOR_MAX, sizeof(*pmic),
GFP_KERNEL); if (!pmic) return -ENOMEM;
for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
tps_pdata = tps65090_pdata->reg_pdata[num];
ri = &pmic[num];
ri->dev = &pdev->dev;
ri->desc = &tps65090_regulator_desc[num]; if (tps_pdata) {
ri->overcurrent_wait_valid =
tps_pdata->overcurrent_wait_valid;
ri->overcurrent_wait = tps_pdata->overcurrent_wait;
}
/* * TPS5090 DCDC support the control from external digital input. * Configure it as per platform data.
*/ if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) { if (tps_pdata->enable_ext_control) {
config.ena_gpiod = tps_pdata->gpiod;
ri->desc->ops = &tps65090_ext_control_ops;
} else {
ret = tps65090_regulator_disable_ext_control(
ri, tps_pdata); if (ret < 0) {
dev_err(&pdev->dev, "failed disable ext control\n"); return ret;
}
}
}
/* * Hand the GPIO descriptor management over to the regulator * core, remove it from devres management.
*/ if (config.ena_gpiod)
devm_gpiod_unhinge(&pdev->dev, config.ena_gpiod);
rdev = devm_regulator_register(&pdev->dev, ri->desc, &config); if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc->name); return PTR_ERR(rdev);
}
ri->rdev = rdev;
if (ri->overcurrent_wait_valid) {
ret = tps65090_reg_set_overcurrent_wait(ri, rdev); if (ret < 0) return ret;
}
/* Enable external control if it is require */ if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
tps_pdata->enable_ext_control) {
ret = tps65090_config_ext_control(ri, true); if (ret < 0) return ret;
}
}
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