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regulator: fan53555: Add TCS4525 DCDC support
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TCS4525 main features:

- 2.7V to 5.5V Input Voltage Range;
- 3MHz Constant Switching Frequency;
- 5A Available Load Current;
- Programmable Output Voltage: 0.6V to 1.4V in 6.25mV Steps;
- PFM/PWM Operation for Optimum Increased Efficiency;

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
[Ezequiel: Forward port]
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Link: https://lore.kernel.org/r/20210421210338.43819-3-ezequiel@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Joseph Chen authored and Mark Brown committed Apr 23, 2021
1 parent 3007acc commit 914df8f
Showing 1 changed file with 122 additions and 14 deletions.
136 changes: 122 additions & 14 deletions drivers/regulator/fan53555.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,12 @@
/* Voltage setting */
#define FAN53555_VSEL0 0x00
#define FAN53555_VSEL1 0x01

#define TCS4525_VSEL0 0x11
#define TCS4525_VSEL1 0x10
#define TCS4525_TIME 0x13
#define TCS4525_COMMAND 0x14

/* Control register */
#define FAN53555_CONTROL 0x02
/* IC Type */
Expand All @@ -49,11 +55,20 @@

#define FAN53555_NVOLTAGES 64 /* Numbers of voltages */
#define FAN53526_NVOLTAGES 128
#define TCS4525_NVOLTAGES 127 /* Numbers of voltages */

#define TCS_VSEL_NSEL_MASK 0x7f
#define TCS_VSEL0_MODE (1 << 7)
#define TCS_VSEL1_MODE (1 << 6)

#define TCS_SLEW_SHIFT 3
#define TCS_SLEW_MASK (0x3 < 3)

enum fan53555_vendor {
FAN53526_VENDOR_FAIRCHILD = 0,
FAN53555_VENDOR_FAIRCHILD,
FAN53555_VENDOR_SILERGY,
FAN53555_VENDOR_TCS,
};

enum {
Expand Down Expand Up @@ -106,6 +121,11 @@ struct fan53555_device_info {
unsigned int mode_mask;
/* Sleep voltage cache */
unsigned int sleep_vol_cache;
/* Slew rate */
unsigned int slew_reg;
unsigned int slew_mask;
unsigned int slew_shift;
unsigned int slew_rate;
};

static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
Expand Down Expand Up @@ -189,13 +209,37 @@ static const int slew_rates[] = {
500,
};

static const int tcs_slew_rates[] = {
18700,
9300,
4600,
2300,
};

static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
{
struct fan53555_device_info *di = rdev_get_drvdata(rdev);
int regval = -1, i;
const int *slew_rate_t;
int slew_rate_n;

for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
if (ramp <= slew_rates[i])
switch (di->vendor) {
case FAN53526_VENDOR_FAIRCHILD:
case FAN53555_VENDOR_FAIRCHILD:
case FAN53555_VENDOR_SILERGY:
slew_rate_t = slew_rates;
slew_rate_n = ARRAY_SIZE(slew_rates);
break;
case FAN53555_VENDOR_TCS:
slew_rate_t = tcs_slew_rates;
slew_rate_n = ARRAY_SIZE(tcs_slew_rates);
break;
default:
return -EINVAL;
}

for (i = 0; i < slew_rate_n; i++) {
if (ramp <= slew_rate_t[i])
regval = i;
else
break;
Expand All @@ -206,8 +250,8 @@ static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
return -EINVAL;
}

return regmap_update_bits(rdev->regmap, FAN53555_CONTROL,
CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
return regmap_update_bits(rdev->regmap, di->slew_reg,
di->slew_mask, regval << di->slew_shift);
}

static const struct regulator_ops fan53555_regulator_ops = {
Expand Down Expand Up @@ -292,7 +336,9 @@ static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
"Chip ID %d not supported!\n", di->chip_id);
return -EINVAL;
}

di->slew_reg = FAN53555_CONTROL;
di->slew_mask = CTL_SLEW_MASK;
di->slew_shift = CTL_SLEW_SHIFT;
di->vsel_count = FAN53555_NVOLTAGES;

return 0;
Expand All @@ -312,12 +358,29 @@ static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
"Chip ID %d not supported!\n", di->chip_id);
return -EINVAL;
}

di->slew_reg = FAN53555_CONTROL;
di->slew_reg = FAN53555_CONTROL;
di->slew_mask = CTL_SLEW_MASK;
di->slew_shift = CTL_SLEW_SHIFT;
di->vsel_count = FAN53555_NVOLTAGES;

return 0;
}

static int fan53555_voltages_setup_tcs(struct fan53555_device_info *di)
{
di->slew_reg = TCS4525_TIME;
di->slew_mask = TCS_SLEW_MASK;
di->slew_shift = TCS_SLEW_MASK;

/* Init voltage range and step */
di->vsel_min = 600000;
di->vsel_step = 6250;
di->vsel_count = TCS4525_NVOLTAGES;

return 0;
}

/* For 00,01,03,05 options:
* VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
* For 04 option:
Expand All @@ -329,17 +392,41 @@ static int fan53555_device_setup(struct fan53555_device_info *di,
int ret = 0;

/* Setup voltage control register */
switch (pdata->sleep_vsel_id) {
case FAN53555_VSEL_ID_0:
di->sleep_reg = FAN53555_VSEL0;
di->vol_reg = FAN53555_VSEL1;
switch (di->vendor) {
case FAN53526_VENDOR_FAIRCHILD:
case FAN53555_VENDOR_FAIRCHILD:
case FAN53555_VENDOR_SILERGY:
switch (pdata->sleep_vsel_id) {
case FAN53555_VSEL_ID_0:
di->sleep_reg = FAN53555_VSEL0;
di->vol_reg = FAN53555_VSEL1;
break;
case FAN53555_VSEL_ID_1:
di->sleep_reg = FAN53555_VSEL1;
di->vol_reg = FAN53555_VSEL0;
break;
default:
dev_err(di->dev, "Invalid VSEL ID!\n");
return -EINVAL;
}
break;
case FAN53555_VSEL_ID_1:
di->sleep_reg = FAN53555_VSEL1;
di->vol_reg = FAN53555_VSEL0;
case FAN53555_VENDOR_TCS:
switch (pdata->sleep_vsel_id) {
case FAN53555_VSEL_ID_0:
di->sleep_reg = TCS4525_VSEL0;
di->vol_reg = TCS4525_VSEL1;
break;
case FAN53555_VSEL_ID_1:
di->sleep_reg = TCS4525_VSEL1;
di->vol_reg = TCS4525_VSEL0;
break;
default:
dev_err(di->dev, "Invalid VSEL ID!\n");
return -EINVAL;
}
break;
default:
dev_err(di->dev, "Invalid VSEL ID!\n");
dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
return -EINVAL;
}

Expand All @@ -362,6 +449,18 @@ static int fan53555_device_setup(struct fan53555_device_info *di,
di->mode_reg = di->vol_reg;
di->mode_mask = VSEL_MODE;
break;
case FAN53555_VENDOR_TCS:
di->mode_reg = TCS4525_COMMAND;

switch (pdata->sleep_vsel_id) {
case FAN53555_VSEL_ID_0:
di->mode_mask = TCS_VSEL1_MODE;
break;
case FAN53555_VSEL_ID_1:
di->mode_mask = TCS_VSEL0_MODE;
break;
}
break;
default:
dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
return -EINVAL;
Expand All @@ -378,6 +477,9 @@ static int fan53555_device_setup(struct fan53555_device_info *di,
case FAN53555_VENDOR_SILERGY:
ret = fan53555_voltages_setup_silergy(di);
break;
case FAN53555_VENDOR_TCS:
ret = fan53555_voltages_setup_tcs(di);
break;
default:
dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
return -EINVAL;
Expand Down Expand Up @@ -449,6 +551,9 @@ static const struct of_device_id __maybe_unused fan53555_dt_ids[] = {
}, {
.compatible = "silergy,syr828",
.data = (void *)FAN53555_VENDOR_SILERGY,
}, {
.compatible = "tcs,tcs4525",
.data = (void *)FAN53555_VENDOR_TCS
},
{ }
};
Expand Down Expand Up @@ -554,6 +659,9 @@ static const struct i2c_device_id fan53555_id[] = {
}, {
.name = "syr828",
.driver_data = FAN53555_VENDOR_SILERGY
}, {
.name = "tcs4525",
.driver_data = FAN53555_VENDOR_TCS
},
{ },
};
Expand Down

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