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@xxxxxxxxxx>
---
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
--
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