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kernel/drivers/regulator/bd96801-regulator.c
Krzysztof Kozlowski f372c262d4
regulator: bd96801: Use scoped device node handling to simplify error paths 
Obtain the device node reference with scoped/cleanup.h and use scoped
for_each_child_of_node_scoped() to reduce error handling and make the
code a bit simpler.  Add also brackets {} over outer for loop for code
readability.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240814-cleanup-h-of-node-put-regulator-v1-2-87151088b883@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2024-08-14 18:21:43 +01:00

901 lines
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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024 ROHM Semiconductors
// bd96801-regulator.c ROHM BD96801 regulator driver
/*
* This version of the "BD86801 scalable PMIC"'s driver supports only very
* basic set of the PMIC features. Most notably, there is no support for
* the ERRB interrupt and the configurations which should be done when the
* PMIC is in STBY mode.
*
* Supporting the ERRB interrupt would require dropping the regmap-IRQ
* usage or working around (or accepting a presense of) a naming conflict
* in debugFS IRQs.
*
* Being able to reliably do the configurations like changing the
* regulator safety limits (like limits for the over/under -voltages, over
* current, thermal protection) would require the configuring driver to be
* synchronized with entity causing the PMIC state transitions. Eg, one
* should be able to ensure the PMIC is in STBY state when the
* configurations are applied to the hardware. How and when the PMIC state
* transitions are to be done is likely to be very system specific, as will
* be the need to configure these safety limits. Hence it's not simple to
* come up with a generic solution.
*
* Users who require the ERRB handling and STBY state configurations can
* have a look at the original RFC:
* https://lore.kernel.org/all/cover.1712920132.git.mazziesaccount@gmail.com/
* which implements a workaround to debugFS naming conflict and some of
* the safety limit configurations - but leaves the state change handling
* and synchronization to be implemented.
*
* It would be great to hear (and receive a patch!) if you implement the
* STBY configuration support or a proper fix to the debugFS naming
* conflict in your downstream driver ;)
*/
#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/linear_range.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/mfd/rohm-bd96801.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/coupler.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>
#include <linux/timer.h>
enum {
BD96801_BUCK1,
BD96801_BUCK2,
BD96801_BUCK3,
BD96801_BUCK4,
BD96801_LDO5,
BD96801_LDO6,
BD96801_LDO7,
BD96801_REGULATOR_AMOUNT,
};
enum {
BD96801_PROT_OVP,
BD96801_PROT_UVP,
BD96801_PROT_OCP,
BD96801_PROT_TEMP,
BD96801_NUM_PROT,
};
#define BD96801_ALWAYS_ON_REG 0x3c
#define BD96801_REG_ENABLE 0x0b
#define BD96801_BUCK1_EN_MASK BIT(0)
#define BD96801_BUCK2_EN_MASK BIT(1)
#define BD96801_BUCK3_EN_MASK BIT(2)
#define BD96801_BUCK4_EN_MASK BIT(3)
#define BD96801_LDO5_EN_MASK BIT(4)
#define BD96801_LDO6_EN_MASK BIT(5)
#define BD96801_LDO7_EN_MASK BIT(6)
#define BD96801_BUCK1_VSEL_REG 0x28
#define BD96801_BUCK2_VSEL_REG 0x29
#define BD96801_BUCK3_VSEL_REG 0x2a
#define BD96801_BUCK4_VSEL_REG 0x2b
#define BD96801_LDO5_VSEL_REG 0x25
#define BD96801_LDO6_VSEL_REG 0x26
#define BD96801_LDO7_VSEL_REG 0x27
#define BD96801_BUCK_VSEL_MASK 0x1F
#define BD96801_LDO_VSEL_MASK 0xff
#define BD96801_MASK_RAMP_DELAY 0xc0
#define BD96801_INT_VOUT_BASE_REG 0x21
#define BD96801_BUCK_INT_VOUT_MASK 0xff
#define BD96801_BUCK_VOLTS 256
#define BD96801_LDO_VOLTS 256
#define BD96801_OVP_MASK 0x03
#define BD96801_MASK_BUCK1_OVP_SHIFT 0x00
#define BD96801_MASK_BUCK2_OVP_SHIFT 0x02
#define BD96801_MASK_BUCK3_OVP_SHIFT 0x04
#define BD96801_MASK_BUCK4_OVP_SHIFT 0x06
#define BD96801_MASK_LDO5_OVP_SHIFT 0x00
#define BD96801_MASK_LDO6_OVP_SHIFT 0x02
#define BD96801_MASK_LDO7_OVP_SHIFT 0x04
#define BD96801_PROT_LIMIT_OCP_MIN 0x00
#define BD96801_PROT_LIMIT_LOW 0x01
#define BD96801_PROT_LIMIT_MID 0x02
#define BD96801_PROT_LIMIT_HI 0x03
#define BD96801_REG_BUCK1_OCP 0x32
#define BD96801_REG_BUCK2_OCP 0x32
#define BD96801_REG_BUCK3_OCP 0x33
#define BD96801_REG_BUCK4_OCP 0x33
#define BD96801_MASK_BUCK1_OCP_SHIFT 0x00
#define BD96801_MASK_BUCK2_OCP_SHIFT 0x04
#define BD96801_MASK_BUCK3_OCP_SHIFT 0x00
#define BD96801_MASK_BUCK4_OCP_SHIFT 0x04
#define BD96801_REG_LDO5_OCP 0x34
#define BD96801_REG_LDO6_OCP 0x34
#define BD96801_REG_LDO7_OCP 0x34
#define BD96801_MASK_LDO5_OCP_SHIFT 0x00
#define BD96801_MASK_LDO6_OCP_SHIFT 0x02
#define BD96801_MASK_LDO7_OCP_SHIFT 0x04
#define BD96801_MASK_SHD_INTB BIT(7)
#define BD96801_INTB_FATAL BIT(7)
#define BD96801_NUM_REGULATORS 7
#define BD96801_NUM_LDOS 4
/*
* Ramp rates for bucks are controlled by bits [7:6] as follows:
* 00 => 1 mV/uS
* 01 => 5 mV/uS
* 10 => 10 mV/uS
* 11 => 20 mV/uS
*/
static const unsigned int buck_ramp_table[] = { 1000, 5000, 10000, 20000 };
/*
* This is a voltage range that get's appended to selected
* bd96801_buck_init_volts value. The range from 0x0 to 0xF is actually
* bd96801_buck_init_volts + 0 ... bd96801_buck_init_volts + 150mV
* and the range from 0x10 to 0x1f is bd96801_buck_init_volts - 150mV ...
* bd96801_buck_init_volts - 0. But as the members of linear_range
* are all unsigned I will apply offset of -150 mV to value in
* linear_range - which should increase these ranges with
* 150 mV getting all the values to >= 0.
*/
static const struct linear_range bd96801_tune_volts[] = {
REGULATOR_LINEAR_RANGE(150000, 0x00, 0xF, 10000),
REGULATOR_LINEAR_RANGE(0, 0x10, 0x1F, 10000),
};
static const struct linear_range bd96801_buck_init_volts[] = {
REGULATOR_LINEAR_RANGE(500000 - 150000, 0x00, 0xc8, 5000),
REGULATOR_LINEAR_RANGE(1550000 - 150000, 0xc9, 0xec, 50000),
REGULATOR_LINEAR_RANGE(3300000 - 150000, 0xed, 0xff, 0),
};
static const struct linear_range bd96801_ldo_int_volts[] = {
REGULATOR_LINEAR_RANGE(300000, 0x00, 0x78, 25000),
REGULATOR_LINEAR_RANGE(3300000, 0x79, 0xff, 0),
};
#define BD96801_LDO_SD_VOLT_MASK 0x1
#define BD96801_LDO_MODE_MASK 0x6
#define BD96801_LDO_MODE_INT 0x0
#define BD96801_LDO_MODE_SD 0x2
#define BD96801_LDO_MODE_DDR 0x4
static int ldo_ddr_volt_table[] = {500000, 300000};
static int ldo_sd_volt_table[] = {3300000, 1800000};
/* Constant IRQ initialization data (templates) */
struct bd96801_irqinfo {
int type;
struct regulator_irq_desc irq_desc;
int err_cfg;
int wrn_cfg;
const char *irq_name;
};
#define BD96801_IRQINFO(_type, _name, _irqoff_ms, _irqname) \
{ \
.type = (_type), \
.err_cfg = -1, \
.wrn_cfg = -1, \
.irq_name = (_irqname), \
.irq_desc = { \
.name = (_name), \
.irq_off_ms = (_irqoff_ms), \
.map_event = regulator_irq_map_event_simple, \
}, \
}
static const struct bd96801_irqinfo buck1_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-h", 500,
"bd96801-buck1-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-l", 500,
"bd96801-buck1-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-n", 500,
"bd96801-buck1-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck1-over-voltage", 500,
"bd96801-buck1-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck1-under-voltage", 500,
"bd96801-buck1-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck1-over-temp", 500,
"bd96801-buck1-thermal")
};
static const struct bd96801_irqinfo buck2_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-h", 500,
"bd96801-buck2-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-l", 500,
"bd96801-buck2-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-n", 500,
"bd96801-buck2-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck2-over-voltage", 500,
"bd96801-buck2-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck2-under-voltage", 500,
"bd96801-buck2-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck2-over-temp", 500,
"bd96801-buck2-thermal")
};
static const struct bd96801_irqinfo buck3_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-h", 500,
"bd96801-buck3-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-l", 500,
"bd96801-buck3-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-n", 500,
"bd96801-buck3-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck3-over-voltage", 500,
"bd96801-buck3-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck3-under-voltage", 500,
"bd96801-buck3-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck3-over-temp", 500,
"bd96801-buck3-thermal")
};
static const struct bd96801_irqinfo buck4_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-h", 500,
"bd96801-buck4-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-l", 500,
"bd96801-buck4-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-n", 500,
"bd96801-buck4-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck4-over-voltage", 500,
"bd96801-buck4-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck4-under-voltage", 500,
"bd96801-buck4-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck4-over-temp", 500,
"bd96801-buck4-thermal")
};
static const struct bd96801_irqinfo ldo5_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo5-overcurr", 500,
"bd96801-ldo5-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo5-over-voltage", 500,
"bd96801-ldo5-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo5-under-voltage", 500,
"bd96801-ldo5-undervolt"),
};
static const struct bd96801_irqinfo ldo6_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo6-overcurr", 500,
"bd96801-ldo6-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo6-over-voltage", 500,
"bd96801-ldo6-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo6-under-voltage", 500,
"bd96801-ldo6-undervolt"),
};
static const struct bd96801_irqinfo ldo7_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo7-overcurr", 500,
"bd96801-ldo7-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo7-over-voltage", 500,
"bd96801-ldo7-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo7-under-voltage", 500,
"bd96801-ldo7-undervolt"),
};
struct bd96801_irq_desc {
struct bd96801_irqinfo *irqinfo;
int num_irqs;
};
struct bd96801_regulator_data {
struct regulator_desc desc;
const struct linear_range *init_ranges;
int num_ranges;
struct bd96801_irq_desc irq_desc;
int initial_voltage;
int ldo_vol_lvl;
int ldo_errs;
};
struct bd96801_pmic_data {
struct bd96801_regulator_data regulator_data[BD96801_NUM_REGULATORS];
struct regmap *regmap;
int fatal_ind;
};
static int ldo_map_notif(int irq, struct regulator_irq_data *rid,
unsigned long *dev_mask)
{
int i;
for (i = 0; i < rid->num_states; i++) {
struct bd96801_regulator_data *rdata;
struct regulator_dev *rdev;
rdev = rid->states[i].rdev;
rdata = container_of(rdev->desc, struct bd96801_regulator_data,
desc);
rid->states[i].notifs = regulator_err2notif(rdata->ldo_errs);
rid->states[i].errors = rdata->ldo_errs;
*dev_mask |= BIT(i);
}
return 0;
}
static int bd96801_list_voltage_lr(struct regulator_dev *rdev,
unsigned int selector)
{
int voltage;
struct bd96801_regulator_data *data;
data = container_of(rdev->desc, struct bd96801_regulator_data, desc);
/*
* The BD096801 has voltage setting in two registers. One giving the
* "initial voltage" (can be changed only when regulator is disabled.
* This driver caches the value and sets it only at startup. The other
* register is voltage tuning value which applies -150 mV ... +150 mV
* offset to the voltage.
*
* Note that the cached initial voltage stored in regulator data is
* 'scaled down' by the 150 mV so that all of our tuning values are
* >= 0. This is done because the linear_ranges uses unsigned values.
*
* As a result, we increase the tuning voltage which we get based on
* the selector by the stored initial_voltage.
*/
voltage = regulator_list_voltage_linear_range(rdev, selector);
if (voltage < 0)
return voltage;
return voltage + data->initial_voltage;
}
static const struct regulator_ops bd96801_ldo_table_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_table,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static const struct regulator_ops bd96801_buck_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = bd96801_list_voltage_lr,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
};
static const struct regulator_ops bd96801_ldo_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static int buck_get_initial_voltage(struct regmap *regmap, struct device *dev,
struct bd96801_regulator_data *data)
{
int ret = 0, sel, initial_uv;
int reg = BD96801_INT_VOUT_BASE_REG + data->desc.id;
if (data->num_ranges) {
ret = regmap_read(regmap, reg, &sel);
sel &= BD96801_BUCK_INT_VOUT_MASK;
ret = linear_range_get_value_array(data->init_ranges,
data->num_ranges, sel,
&initial_uv);
if (ret)
return ret;
data->initial_voltage = initial_uv;
dev_dbg(dev, "Tune-scaled initial voltage %u\n",
data->initial_voltage);
}
return 0;
}
static int get_ldo_initial_voltage(struct regmap *regmap,
struct device *dev,
struct bd96801_regulator_data *data)
{
int ret;
int cfgreg;
ret = regmap_read(regmap, data->ldo_vol_lvl, &cfgreg);
if (ret)
return ret;
switch (cfgreg & BD96801_LDO_MODE_MASK) {
case BD96801_LDO_MODE_DDR:
data->desc.volt_table = ldo_ddr_volt_table;
data->desc.n_voltages = ARRAY_SIZE(ldo_ddr_volt_table);
break;
case BD96801_LDO_MODE_SD:
data->desc.volt_table = ldo_sd_volt_table;
data->desc.n_voltages = ARRAY_SIZE(ldo_sd_volt_table);
break;
default:
dev_info(dev, "Leaving LDO to normal mode");
return 0;
}
/* SD or DDR mode => override default ops */
data->desc.ops = &bd96801_ldo_table_ops,
data->desc.vsel_mask = 1;
data->desc.vsel_reg = data->ldo_vol_lvl;
return 0;
}
static int get_initial_voltage(struct device *dev, struct regmap *regmap,
struct bd96801_regulator_data *data)
{
/* BUCK */
if (data->desc.id <= BD96801_BUCK4)
return buck_get_initial_voltage(regmap, dev, data);
/* LDO */
return get_ldo_initial_voltage(regmap, dev, data);
}
static int bd96801_walk_regulator_dt(struct device *dev, struct regmap *regmap,
struct bd96801_regulator_data *data,
int num)
{
int i, ret;
struct device_node *nproot __free(device_node) =
of_get_child_by_name(dev->parent->of_node, "regulators");
if (!nproot) {
dev_err(dev, "failed to find regulators node\n");
return -ENODEV;
}
for_each_child_of_node_scoped(nproot, np) {
for (i = 0; i < num; i++) {
if (!of_node_name_eq(np, data[i].desc.of_match))
continue;
/*
* If STBY configs are supported, we must pass node
* here to extract the initial voltages from the DT.
* Thus we do the initial voltage getting in this
* loop.
*/
ret = get_initial_voltage(dev, regmap, &data[i]);
if (ret) {
dev_err(dev,
"Initializing voltages for %s failed\n",
data[i].desc.name);
return ret;
}
if (of_property_read_bool(np, "rohm,keep-on-stby")) {
ret = regmap_set_bits(regmap,
BD96801_ALWAYS_ON_REG,
1 << data[i].desc.id);
if (ret) {
dev_err(dev,
"failed to set %s on-at-stby\n",
data[i].desc.name);
return ret;
}
}
}
}
return 0;
}
/*
* Template for regulator data. Probe will allocate dynamic / driver instance
* struct so we should be on a safe side even if there were multiple PMICs to
* control. Note that there is a plan to allow multiple PMICs to be used so
* systems can scale better. I am however still slightly unsure how the
* multi-PMIC case will be handled. I don't know if the processor will have I2C
* acces to all of the PMICs or only the first one. I'd guess there will be
* access provided to all PMICs for voltage scaling - but the errors will only
* be informed via the master PMIC. Eg, we should prepare to support multiple
* driver instances - either with or without the IRQs... Well, let's first
* just support the simple and clear single-PMIC setup and ponder the multi PMIC
* case later. What we can easly do for preparing is to not use static global
* data for regulators though.
*/
static const struct bd96801_pmic_data bd96801_data = {
.regulator_data = {
{
.desc = {
.name = "buck1",
.of_match = of_match_ptr("buck1"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK1,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK1_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK1_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK1_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck1_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck1_irqinfo),
},
}, {
.desc = {
.name = "buck2",
.of_match = of_match_ptr("buck2"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK2,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK2_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK2_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK2_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck2_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck2_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "buck3",
.of_match = of_match_ptr("buck3"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK3,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK3_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK3_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK3_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck3_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck3_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "buck4",
.of_match = of_match_ptr("buck4"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK4,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK4_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK4_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK4_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck4_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck4_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "ldo5",
.of_match = of_match_ptr("ldo5"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO5,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO5_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO5_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo5_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo5_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO5_VOL_LVL_REG,
}, {
.desc = {
.name = "ldo6",
.of_match = of_match_ptr("ldo6"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO6,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO6_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO6_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo6_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo6_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO6_VOL_LVL_REG,
}, {
.desc = {
.name = "ldo7",
.of_match = of_match_ptr("ldo7"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO7,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO7_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO7_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo7_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo7_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO7_VOL_LVL_REG,
},
},
};
static int initialize_pmic_data(struct device *dev,
struct bd96801_pmic_data *pdata)
{
int r, i;
/*
* Allocate and initialize IRQ data for all of the regulators. We
* wish to modify IRQ information independently for each driver
* instance.
*/
for (r = 0; r < BD96801_NUM_REGULATORS; r++) {
const struct bd96801_irqinfo *template;
struct bd96801_irqinfo *new;
int num_infos;
template = pdata->regulator_data[r].irq_desc.irqinfo;
num_infos = pdata->regulator_data[r].irq_desc.num_irqs;
new = devm_kcalloc(dev, num_infos, sizeof(*new), GFP_KERNEL);
if (!new)
return -ENOMEM;
pdata->regulator_data[r].irq_desc.irqinfo = new;
for (i = 0; i < num_infos; i++)
new[i] = template[i];
}
return 0;
}
static int bd96801_rdev_intb_irqs(struct platform_device *pdev,
struct bd96801_pmic_data *pdata,
struct bd96801_irqinfo *iinfo,
struct regulator_dev *rdev)
{
struct regulator_dev *rdev_arr[1];
void *retp;
int err = 0;
int irq;
int err_flags[] = {
[BD96801_PROT_OVP] = REGULATOR_ERROR_REGULATION_OUT,
[BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE,
[BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT,
[BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP,
};
int wrn_flags[] = {
[BD96801_PROT_OVP] = REGULATOR_ERROR_OVER_VOLTAGE_WARN,
[BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
[BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT_WARN,
[BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP_WARN,
};
/*
* Don't install IRQ handler if both error and warning
* notifications are explicitly disabled
*/
if (!iinfo->err_cfg && !iinfo->wrn_cfg)
return 0;
if (WARN_ON(iinfo->type >= BD96801_NUM_PROT))
return -EINVAL;
if (iinfo->err_cfg)
err = err_flags[iinfo->type];
else if (iinfo->wrn_cfg)
err = wrn_flags[iinfo->type];
iinfo->irq_desc.data = pdata;
irq = platform_get_irq_byname(pdev, iinfo->irq_name);
if (irq < 0)
return irq;
/* Find notifications for this IRQ (WARN/ERR) */
rdev_arr[0] = rdev;
retp = devm_regulator_irq_helper(&pdev->dev,
&iinfo->irq_desc, irq,
0, err, NULL, rdev_arr,
1);
if (IS_ERR(retp))
return PTR_ERR(retp);
return 0;
}
static int bd96801_probe(struct platform_device *pdev)
{
struct regulator_dev *ldo_errs_rdev_arr[BD96801_NUM_LDOS];
struct bd96801_regulator_data *rdesc;
struct regulator_config config = {};
int ldo_errs_arr[BD96801_NUM_LDOS];
struct bd96801_pmic_data *pdata;
int temp_notif_ldos = 0;
struct device *parent;
int i, ret;
void *retp;
parent = pdev->dev.parent;
pdata = devm_kmemdup(&pdev->dev, &bd96801_data, sizeof(bd96801_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
if (initialize_pmic_data(&pdev->dev, pdata))
return -ENOMEM;
pdata->regmap = dev_get_regmap(parent, NULL);
if (!pdata->regmap) {
dev_err(&pdev->dev, "No register map found\n");
return -ENODEV;
}
rdesc = &pdata->regulator_data[0];
config.driver_data = pdata;
config.regmap = pdata->regmap;
config.dev = parent;
ret = bd96801_walk_regulator_dt(&pdev->dev, pdata->regmap, rdesc,
BD96801_NUM_REGULATORS);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(pdata->regulator_data); i++) {
struct regulator_dev *rdev;
struct bd96801_irq_desc *idesc = &rdesc[i].irq_desc;
int j;
rdev = devm_regulator_register(&pdev->dev,
&rdesc[i].desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"failed to register %s regulator\n",
rdesc[i].desc.name);
return PTR_ERR(rdev);
}
/*
* LDOs don't have own temperature monitoring. If temperature
* notification was requested for this LDO from DT then we will
* add the regulator to be notified if central IC temperature
* exceeds threshold.
*/
if (rdesc[i].ldo_errs) {
ldo_errs_rdev_arr[temp_notif_ldos] = rdev;
ldo_errs_arr[temp_notif_ldos] = rdesc[i].ldo_errs;
temp_notif_ldos++;
}
/* Register INTB handlers for configured protections */
for (j = 0; j < idesc->num_irqs; j++) {
ret = bd96801_rdev_intb_irqs(pdev, pdata,
&idesc->irqinfo[j], rdev);
if (ret)
return ret;
}
}
if (temp_notif_ldos) {
int irq;
struct regulator_irq_desc tw_desc = {
.name = "bd96801-core-thermal",
.irq_off_ms = 500,
.map_event = ldo_map_notif,
};
irq = platform_get_irq_byname(pdev, "bd96801-core-thermal");
if (irq < 0)
return irq;
retp = devm_regulator_irq_helper(&pdev->dev, &tw_desc, irq, 0,
0, &ldo_errs_arr[0],
&ldo_errs_rdev_arr[0],
temp_notif_ldos);
if (IS_ERR(retp))
return PTR_ERR(retp);
}
return 0;
}
static const struct platform_device_id bd96801_pmic_id[] = {
{ "bd96801-regulator", },
{ }
};
MODULE_DEVICE_TABLE(platform, bd96801_pmic_id);
static struct platform_driver bd96801_regulator = {
.driver = {
.name = "bd96801-pmic"
},
.probe = bd96801_probe,
.id_table = bd96801_pmic_id,
};
module_platform_driver(bd96801_regulator);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD96801 voltage regulator driver");
MODULE_LICENSE("GPL");
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