LDO8 of Palma device like tps65913 support the tracking mode on which LDO8 track the SMPS45 voltage when SMPS45 is ON and use the LDO8.VOLTAGE_SEL register when SMPS45 is OFF.
On track mode, the steps of voltage change for LDO8 is 25mV where in non-tracking mode it is 50mV. Set the steps accordingly. Number of voltage count is still same for both the cases. Signed-off-by: Laxman Dewangan <[email protected]> --- drivers/regulator/palmas-regulator.c | 53 ++++++++++++++++++++++++++++++++++ include/linux/mfd/palmas.h | 3 ++ 2 files changed, 56 insertions(+), 0 deletions(-) diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c index 28080a7..d6efaf1 100644 --- a/drivers/regulator/palmas-regulator.c +++ b/drivers/regulator/palmas-regulator.c @@ -572,6 +572,46 @@ static int palmas_extreg_init(struct palmas *palmas, int id, return 0; } +static void palmas_enable_ldo8_track(struct palmas *palmas) +{ + unsigned int reg; + unsigned int addr; + int ret; + + addr = palmas_regs_info[PALMAS_REG_LDO8].ctrl_addr; + + ret = palmas_ldo_read(palmas, addr, ®); + if (ret) { + dev_err(palmas->dev, "Error in reading ldo8 control reg\n"); + return; + } + + reg |= PALMAS_LDO8_CTRL_LDO_TRACKING_EN; + ret = palmas_ldo_write(palmas, addr, reg); + if (ret < 0) { + dev_err(palmas->dev, "Error in enabling tracking mode\n"); + return; + } + /* + * When SMPS45 is set to off and LDO8 tracking is enabled, the LDO8 + * output is defined by the LDO8_VOLTAGE.VSEL register divided by two, + * and can be set from 0.45 to 1.65 V. + */ + addr = palmas_regs_info[PALMAS_REG_LDO8].vsel_addr; + ret = palmas_ldo_read(palmas, addr, ®); + if (ret) { + dev_err(palmas->dev, "Error in reading ldo8 voltage reg\n"); + return; + } + + reg = (reg << 1) & PALMAS_LDO8_VOLTAGE_VSEL_MASK; + ret = palmas_ldo_write(palmas, addr, reg); + if (ret < 0) + dev_err(palmas->dev, "Error in setting ldo8 voltage reg\n"); + + return; +} + static struct of_regulator_match palmas_matches[] = { { .name = "smps12", }, { .name = "smps123", }, @@ -657,6 +697,11 @@ static void palmas_dt_to_pdata(struct device *dev, if (ret) pdata->reg_init[idx]->vsel = PALMAS_SMPS12_VOLTAGE_RANGE; + + if (idx == PALMAS_REG_LDO8) + pdata->enable_ldo8_tracking = of_property_read_bool( + palmas_matches[idx].of_node, + "ti,enable-ldo8-tracking"); } pdata->ldo6_vibrator = of_property_read_bool(node, "ti,ldo6-vibrator"); @@ -836,6 +881,13 @@ static int palmas_regulators_probe(struct platform_device *pdev) palmas_regs_info[id].ctrl_addr); pmic->desc[id].enable_mask = PALMAS_LDO1_CTRL_MODE_ACTIVE; + + /* Check if LDO8 is in tracking mode or not */ + if (pdata && (id == PALMAS_REG_LDO8) && + pdata->enable_ldo8_tracking) { + palmas_enable_ldo8_track(palmas); + pmic->desc[id].uV_step = 25000; + } } else { pmic->desc[id].n_voltages = 1; pmic->desc[id].ops = &palmas_ops_extreg; @@ -884,6 +936,7 @@ static int palmas_regulators_probe(struct platform_device *pdev) } } + return 0; err_unregister_regulator: diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h index fb04d07..12d8a62 100644 --- a/include/linux/mfd/palmas.h +++ b/include/linux/mfd/palmas.h @@ -187,6 +187,9 @@ struct palmas_pmic_platform_data { /* use LDO6 for vibrator control */ int ldo6_vibrator; + + /* Enable tracking mode of LDO8 */ + bool enable_ldo8_tracking; }; struct palmas_usb_platform_data { -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
