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regulator: anatop: Add power gating support to digital LDOs

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The ARM, PU, and SOC LDOs in the i.MX6 PMU can completely gate
their power output. Since power gating is configured by writing
zero to the voltage target bitfield,, store a copy of the
voltage selector to be restored when reenabling the regulator.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Philipp Zabel 2014-02-11 14:43:44 +01:00 committed by Mark Brown
parent 38dbfb59d1
commit 605ebd35f0
1 changed files with 74 additions and 2 deletions
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76
drivers/regulator/anatop-regulator.c
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@ -34,6 +34,8 @@
#define LDO_RAMP_UP_UNIT_IN_CYCLES 64 /* 64 cycles per step */
#define LDO_RAMP_UP_FREQ_IN_MHZ 24 /* cycle based on 24M OSC */
#define LDO_POWER_GATE 0x00
struct anatop_regulator {
const char *name;
u32 control_reg;
@ -48,6 +50,7 @@ struct anatop_regulator {
int max_voltage;
struct regulator_desc rdesc;
struct regulator_init_data *initdata;
int sel;
};
static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
@ -97,14 +100,68 @@ static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
return regulator_get_voltage_sel_regmap(reg);
}
static int anatop_regmap_enable(struct regulator_dev *reg)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
return regulator_set_voltage_sel_regmap(reg, anatop_reg->sel);
}
static int anatop_regmap_disable(struct regulator_dev *reg)
{
return regulator_set_voltage_sel_regmap(reg, LDO_POWER_GATE);
}
static int anatop_regmap_is_enabled(struct regulator_dev *reg)
{
return regulator_get_voltage_sel_regmap(reg) != LDO_POWER_GATE;
}
static int anatop_regmap_core_set_voltage_sel(struct regulator_dev *reg,
unsigned selector)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
int ret;
if (!anatop_regmap_is_enabled(reg)) {
anatop_reg->sel = selector;
return 0;
}
ret = regulator_set_voltage_sel_regmap(reg, selector);
if (!ret)
anatop_reg->sel = selector;
return ret;
}
static int anatop_regmap_core_get_voltage_sel(struct regulator_dev *reg)
{
struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
if (!anatop_regmap_is_enabled(reg))
return anatop_reg->sel;
return regulator_get_voltage_sel_regmap(reg);
}
static struct regulator_ops anatop_rops = {
.set_voltage_sel = anatop_regmap_set_voltage_sel,
.set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
.get_voltage_sel = anatop_regmap_get_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
};
static struct regulator_ops anatop_core_rops = {
.enable = anatop_regmap_enable,
.disable = anatop_regmap_disable,
.is_enabled = anatop_regmap_is_enabled,
.set_voltage_sel = anatop_regmap_core_set_voltage_sel,
.set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
.get_voltage_sel = anatop_regmap_core_get_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
};
static int anatop_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -116,6 +173,7 @@ static int anatop_regulator_probe(struct platform_device *pdev)
struct regulator_init_data *initdata;
struct regulator_config config = { };
int ret = 0;
u32 val;
initdata = of_get_regulator_init_data(dev, np);
sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
@ -125,7 +183,6 @@ static int anatop_regulator_probe(struct platform_device *pdev)
sreg->name = of_get_property(np, "regulator-name", NULL);
rdesc = &sreg->rdesc;
rdesc->name = sreg->name;
rdesc->ops = &anatop_rops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->owner = THIS_MODULE;
@ -197,6 +254,21 @@ static int anatop_regulator_probe(struct platform_device *pdev)
config.of_node = pdev->dev.of_node;
config.regmap = sreg->anatop;
/* Only core regulators have the ramp up delay configuration. */
if (sreg->control_reg && sreg->delay_bit_width) {
rdesc->ops = &anatop_core_rops;
ret = regmap_read(config.regmap, rdesc->vsel_reg, &val);
if (ret) {
dev_err(dev, "failed to read initial state\n");
return ret;
}
sreg->sel = (val & rdesc->vsel_mask) >> sreg->vol_bit_shift;
} else {
rdesc->ops = &anatop_rops;
}
/* register regulator */
rdev = devm_regulator_register(dev, rdesc, &config);
if (IS_ERR(rdev)) {