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mfd: tps65218.c: Add input voltage options 

These options apply to all regulators in this chip.

ti,strict-supply-voltage-supervision:
  Set STRICT flag in CONFIG1
ti,under-voltage-limit-microvolt:
  Select 2.75, 2.95, 3.25 or 3.35 V UVLO in CONFIG1
ti,under-voltage-hyst-microvolt:
  Select 200mV or 400mV UVLOHYS in CONFIG2

Signed-off-by: Christian Hohnstaedt <Christian.Hohnstaedt@wago.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
hifive-unleashed-5.1
Christian Hohnstaedt 2019-01-14 09:16:34 +01:00 committed by Lee Jones
parent b2b658752c
commit d57f72875e
2 changed files with 93 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
drivers/mfd/tps65218.c
View File

@ -211,6 +211,83 @@ static const struct of_device_id of_tps65218_match_table[] = {
};
MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
static int tps65218_voltage_set_strict(struct tps65218 *tps)
{
u32 strict;
if (of_property_read_u32(tps->dev->of_node,
"ti,strict-supply-voltage-supervision",
&strict))
return 0;
if (strict != 0 && strict != 1) {
dev_err(tps->dev,
"Invalid ti,strict-supply-voltage-supervision value\n");
return -EINVAL;
}
tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_STRICT,
strict ? TPS65218_CONFIG1_STRICT : 0,
TPS65218_PROTECT_L1);
return 0;
}
static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
{
u32 hyst;
if (of_property_read_u32(tps->dev->of_node,
"ti,under-voltage-hyst-microvolt", &hyst))
return 0;
if (hyst != 400000 && hyst != 200000) {
dev_err(tps->dev,
"Invalid ti,under-voltage-hyst-microvolt value\n");
return -EINVAL;
}
tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
TPS65218_CONFIG2_UVLOHYS,
hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
TPS65218_PROTECT_L1);
return 0;
}
static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
{
u32 uvlo;
int uvloval;
if (of_property_read_u32(tps->dev->of_node,
"ti,under-voltage-limit-microvolt", &uvlo))
return 0;
switch (uvlo) {
case 2750000:
uvloval = TPS65218_CONFIG1_UVLO_2750000;
break;
case 2950000:
uvloval = TPS65218_CONFIG1_UVLO_2950000;
break;
case 3250000:
uvloval = TPS65218_CONFIG1_UVLO_3250000;
break;
case 3350000:
uvloval = TPS65218_CONFIG1_UVLO_3350000;
break;
default:
dev_err(tps->dev,
"Invalid ti,under-voltage-limit-microvolt value\n");
return -EINVAL;
}
tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
TPS65218_CONFIG1_UVLO_MASK, uvloval,
TPS65218_PROTECT_L1);
return 0;
}
static int tps65218_probe(struct i2c_client *client,
const struct i2c_device_id *ids)
{
@ -249,6 +326,18 @@ static int tps65218_probe(struct i2c_client *client,
tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
ret = tps65218_voltage_set_strict(tps);
if (ret)
return ret;
ret = tps65218_voltage_set_uvlo(tps);
if (ret)
return ret;
ret = tps65218_voltage_set_uv_hyst(tps);
if (ret)
return ret;
ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
ARRAY_SIZE(tps65218_cells), NULL, 0,
regmap_irq_get_domain(tps->irq_data));

4
include/linux/mfd/tps65218.h
View File

@ -137,6 +137,10 @@
#define TPS65218_CONFIG1_PGDLY_MASK 0x18
#define TPS65218_CONFIG1_STRICT BIT(2)
#define TPS65218_CONFIG1_UVLO_MASK 0x3
#define TPS65218_CONFIG1_UVLO_2750000 0x0
#define TPS65218_CONFIG1_UVLO_2950000 0x1
#define TPS65218_CONFIG1_UVLO_3250000 0x2
#define TPS65218_CONFIG1_UVLO_3350000 0x3
#define TPS65218_CONFIG2_DC12_RST BIT(7)
#define TPS65218_CONFIG2_UVLOHYS BIT(6)