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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2021 ROHM Semiconductors
*
* ROHM BD9576MUF and BD9573MUF PMIC driver
*/
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rohm-bd957x.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/types.h>
enum {
BD957X_REGULATOR_CELL,
BD957X_WDT_CELL,
};
/*
* Due to the BD9576MUF nasty IRQ behaviour we don't always populate IRQs.
* These will be added to regulator resources only if IRQ information for the
* PMIC is populated in device-tree.
*/
static const struct resource bd9576_regulator_irqs[] = {
DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"),
DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"),
DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"),
};
static struct mfd_cell bd9573_mfd_cells[] = {
[BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", },
[BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
};
static struct mfd_cell bd9576_mfd_cells[] = {
[BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", },
[BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
};
static const struct regmap_range volatile_ranges[] = {
regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT),
regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT,
BD957X_REG_PMIC_INTERNAL_STAT),
regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT),
regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT),
regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT),
};
static const struct regmap_access_table volatile_regs = {
.yes_ranges = &volatile_ranges[0],
.n_yes_ranges = ARRAY_SIZE(volatile_ranges),
};
static const struct regmap_config bd957x_regmap = {
.reg_bits = 8,
.val_bits = 8,
.volatile_table = &volatile_regs,
.max_register = BD957X_MAX_REGISTER,
.cache_type = REGCACHE_MAPLE,
};
static const struct regmap_irq bd9576_irqs[] = {
REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM),
REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP),
REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP),
REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP),
REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD),
REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD),
REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP),
REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS),
};
static const struct regmap_irq_chip bd9576_irq_chip = {
.name = "bd9576_irq",
.irqs = &bd9576_irqs[0],
.num_irqs = ARRAY_SIZE(bd9576_irqs),
.status_base = BD957X_REG_INT_MAIN_STAT,
.mask_base = BD957X_REG_INT_MAIN_MASK,
.ack_base = BD957X_REG_INT_MAIN_STAT,
.init_ack_masked = true,
.num_regs = 1,
.irq_reg_stride = 1,
};
static int bd957x_i2c_probe(struct i2c_client *i2c)
{
int ret;
struct regmap *regmap;
struct mfd_cell *cells;
int num_cells;
unsigned long chip_type;
struct irq_domain *domain;
bool usable_irqs;
chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
switch (chip_type) {
case ROHM_CHIP_TYPE_BD9576:
cells = bd9576_mfd_cells;
num_cells = ARRAY_SIZE(bd9576_mfd_cells);
usable_irqs = !!i2c->irq;
break;
case ROHM_CHIP_TYPE_BD9573:
cells = bd9573_mfd_cells;
num_cells = ARRAY_SIZE(bd9573_mfd_cells);
/*
* BD9573 only supports fatal IRQs which we can not handle
* because SoC is going to lose the power.
*/
usable_irqs = false;
break;
default:
dev_err(&i2c->dev, "Unknown device type");
return -EINVAL;
}
regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap);
if (IS_ERR(regmap))
return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
"Failed to initialize Regmap\n");
/*
* BD9576 behaves badly. It kepts IRQ line asserted for the whole
* duration of detected HW condition (like over temperature). So we
* don't require IRQ to be populated.
* If IRQ information is not given, then we mask all IRQs and do not
* provide IRQ resources to regulator driver - which then just omits
* the notifiers.
*/
if (usable_irqs) {
struct regmap_irq_chip_data *irq_data;
struct mfd_cell *regulators;
regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL];
regulators->resources = bd9576_regulator_irqs;
regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs);
ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
IRQF_ONESHOT, 0,
&bd9576_irq_chip, &irq_data);
if (ret)
return dev_err_probe(&i2c->dev, ret,
"Failed to add IRQ chip\n");
domain = regmap_irq_get_domain(irq_data);
} else {
ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK,
BD957X_MASK_INT_ALL,
BD957X_MASK_INT_ALL);
if (ret)
return ret;
domain = NULL;
}
ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells,
num_cells, NULL, 0, domain);
if (ret)
dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
return ret;
}
static const struct of_device_id bd957x_of_match[] = {
{ .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, },
{ .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, },
{ },
};
MODULE_DEVICE_TABLE(of, bd957x_of_match);
static struct i2c_driver bd957x_drv = {
.driver = {
.name = "rohm-bd957x",
.of_match_table = bd957x_of_match,
},
.probe = bd957x_i2c_probe,
};
module_i2c_driver(bd957x_drv);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver");
MODULE_LICENSE("GPL");
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