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regulator: palmas: add support for LDO8 tracking mode

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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 <ldewangan@nvidia.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Laxman Dewangan 2013-04-17 15:13:13 +05:30 committed by Mark Brown
parent aa07f02793
commit 17c11a7603
2 changed files with 56 additions and 0 deletions
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53
drivers/regulator/palmas-regulator.c
View file

@ -571,6 +571,46 @@ 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, &reg);
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, &reg);
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", },
@ -656,6 +696,11 @@ 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");
@ -835,6 +880,13 @@ 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;
@ -883,6 +935,7 @@ static int palmas_regulators_probe(struct platform_device *pdev)
}
}
return 0;
err_unregister_regulator:

3
include/linux/mfd/palmas.h
View file

@ -177,6 +177,9 @@ 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 {