Commit 60b050ff authored by Luca Ceresoli's avatar Luca Ceresoli Committed by Lee Jones

mfd: max77714: Add driver for Maxim MAX77714 PMIC

Add a simple driver for the Maxim MAX77714 PMIC, supporting RTC and
watchdog only.
Signed-off-by: default avatarLuca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent d1f31884
......@@ -11695,6 +11695,8 @@ MAXIM MAX77714 PMIC MFD DRIVER
M: Luca Ceresoli <luca@lucaceresoli.net>
S: Maintained
F: Documentation/devicetree/bindings/mfd/maxim,max77714.yaml
F: drivers/mfd/max77714.c
F: include/linux/mfd/max77714.h
MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER
M: Javier Martinez Canillas <javier@dowhile0.org>
......
......@@ -849,6 +849,20 @@ config MFD_MAX77693
additional drivers must be enabled in order to use the functionality
of the device.
config MFD_MAX77714
tristate "Maxim Semiconductor MAX77714 PMIC Support"
depends on I2C
depends on OF || COMPILE_TEST
select MFD_CORE
select REGMAP_I2C
help
Say yes here to add support for Maxim Semiconductor MAX77714.
This is a Power Management IC with 4 buck regulators, 9
low-dropout regulators, 8 GPIOs, RTC, watchdog etc. This driver
provides common support for accessing the device; additional
drivers must be enabled in order to use each functionality of the
device.
config MFD_MAX77843
bool "Maxim Semiconductor MAX77843 PMIC Support"
depends on I2C=y
......
......@@ -162,6 +162,7 @@ obj-$(CONFIG_MFD_MAX77620) += max77620.o
obj-$(CONFIG_MFD_MAX77650) += max77650.o
obj-$(CONFIG_MFD_MAX77686) += max77686.o
obj-$(CONFIG_MFD_MAX77693) += max77693.o
obj-$(CONFIG_MFD_MAX77714) += max77714.o
obj-$(CONFIG_MFD_MAX77843) += max77843.o
obj-$(CONFIG_MFD_MAX8907) += max8907.o
max8925-objs := max8925-core.o max8925-i2c.o
......
// SPDX-License-Identifier: GPL-2.0-only
/*
* Maxim MAX77714 Core Driver
*
* Copyright (C) 2022 Luca Ceresoli
* Author: Luca Ceresoli <luca@lucaceresoli.net>
*/
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77714.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
static const struct mfd_cell max77714_cells[] = {
{ .name = "max77714-watchdog" },
{ .name = "max77714-rtc" },
};
static const struct regmap_range max77714_readable_ranges[] = {
regmap_reg_range(MAX77714_INT_TOP, MAX77714_INT_TOP),
regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
regmap_reg_range(MAX77714_32K_STATUS, MAX77714_32K_CONFIG),
regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
};
static const struct regmap_range max77714_writable_ranges[] = {
regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
regmap_reg_range(MAX77714_32K_CONFIG, MAX77714_32K_CONFIG),
regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
};
static const struct regmap_access_table max77714_readable_table = {
.yes_ranges = max77714_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(max77714_readable_ranges),
};
static const struct regmap_access_table max77714_writable_table = {
.yes_ranges = max77714_writable_ranges,
.n_yes_ranges = ARRAY_SIZE(max77714_writable_ranges),
};
static const struct regmap_config max77714_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77714_CNFG2_ONOFF,
.rd_table = &max77714_readable_table,
.wr_table = &max77714_writable_table,
};
static const struct regmap_irq max77714_top_irqs[] = {
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_ONOFF, 0, MAX77714_INT_TOP_ONOFF),
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_RTC, 0, MAX77714_INT_TOP_RTC),
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GPIO, 0, MAX77714_INT_TOP_GPIO),
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_LDO, 0, MAX77714_INT_TOP_LDO),
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_SD, 0, MAX77714_INT_TOP_SD),
REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GLBL, 0, MAX77714_INT_TOP_GLBL),
};
static const struct regmap_irq_chip max77714_irq_chip = {
.name = "max77714-pmic",
.status_base = MAX77714_INT_TOP,
.mask_base = MAX77714_INT_TOPM,
.num_regs = 1,
.irqs = max77714_top_irqs,
.num_irqs = ARRAY_SIZE(max77714_top_irqs),
};
/*
* MAX77714 initially uses the internal, low precision oscillator. Enable
* the external oscillator by setting the XOSC_RETRY bit. If the external
* oscillator is not OK (probably not installed) this has no effect.
*/
static int max77714_setup_xosc(struct device *dev, struct regmap *regmap)
{
/* Internal Crystal Load Capacitance, indexed by value of 32KLOAD bits */
static const unsigned int load_cap[4] = {0, 10, 12, 22}; /* pF */
unsigned int load_cap_idx;
unsigned int status;
int err;
err = regmap_update_bits(regmap, MAX77714_32K_CONFIG,
MAX77714_32K_CONFIG_XOSC_RETRY,
MAX77714_32K_CONFIG_XOSC_RETRY);
if (err)
return dev_err_probe(dev, err, "Failed to configure the external oscillator\n");
err = regmap_read(regmap, MAX77714_32K_STATUS, &status);
if (err)
return dev_err_probe(dev, err, "Failed to read external oscillator status\n");
load_cap_idx = (status >> MAX77714_32K_STATUS_32KLOAD_SHF)
& MAX77714_32K_STATUS_32KLOAD_MSK;
dev_info(dev, "Using %s oscillator, %d pF load cap\n",
status & MAX77714_32K_STATUS_32KSOURCE ? "internal" : "external",
load_cap[load_cap_idx]);
return 0;
}
static int max77714_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct regmap *regmap;
struct regmap_irq_chip_data *irq_data;
int err;
regmap = devm_regmap_init_i2c(client, &max77714_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to initialise regmap\n");
err = max77714_setup_xosc(dev, regmap);
if (err)
return err;
err = devm_regmap_add_irq_chip(dev, regmap, client->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77714_irq_chip, &irq_data);
if (err)
return dev_err_probe(dev, err, "Failed to add PMIC IRQ chip\n");
err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
max77714_cells, ARRAY_SIZE(max77714_cells),
NULL, 0, NULL);
if (err)
return dev_err_probe(dev, err, "Failed to register child devices\n");
return 0;
}
static const struct of_device_id max77714_dt_match[] = {
{ .compatible = "maxim,max77714" },
{},
};
MODULE_DEVICE_TABLE(of, max77714_dt_match);
static struct i2c_driver max77714_driver = {
.driver = {
.name = "max77714",
.of_match_table = max77714_dt_match,
},
.probe_new = max77714_probe,
};
module_i2c_driver(max77714_driver);
MODULE_DESCRIPTION("Maxim MAX77714 MFD core driver");
MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
MODULE_LICENSE("GPL");
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Maxim MAX77714 Register and data structures definition.
*
* Copyright (C) 2022 Luca Ceresoli
* Author: Luca Ceresoli <luca@lucaceresoli.net>
*/
#ifndef __LINUX_MFD_MAX77714_H_
#define __LINUX_MFD_MAX77714_H_
#include <linux/bits.h>
#define MAX77714_INT_TOP 0x00
#define MAX77714_INT_TOPM 0x07 /* Datasheet says "read only", but it is RW */
#define MAX77714_INT_TOP_ONOFF BIT(1)
#define MAX77714_INT_TOP_RTC BIT(3)
#define MAX77714_INT_TOP_GPIO BIT(4)
#define MAX77714_INT_TOP_LDO BIT(5)
#define MAX77714_INT_TOP_SD BIT(6)
#define MAX77714_INT_TOP_GLBL BIT(7)
#define MAX77714_32K_STATUS 0x30
#define MAX77714_32K_STATUS_SIOSCOK BIT(5)
#define MAX77714_32K_STATUS_XOSCOK BIT(4)
#define MAX77714_32K_STATUS_32KSOURCE BIT(3)
#define MAX77714_32K_STATUS_32KLOAD_MSK 0x3
#define MAX77714_32K_STATUS_32KLOAD_SHF 1
#define MAX77714_32K_STATUS_CRYSTAL_CFG BIT(0)
#define MAX77714_32K_CONFIG 0x31
#define MAX77714_32K_CONFIG_XOSC_RETRY BIT(4)
#define MAX77714_CNFG_GLBL2 0x91
#define MAX77714_WDTEN BIT(2)
#define MAX77714_WDTSLPC BIT(3)
#define MAX77714_TWD_MASK 0x3
#define MAX77714_TWD_2s 0x0
#define MAX77714_TWD_16s 0x1
#define MAX77714_TWD_64s 0x2
#define MAX77714_TWD_128s 0x3
#define MAX77714_CNFG_GLBL3 0x92
#define MAX77714_WDTC BIT(0)
#define MAX77714_CNFG2_ONOFF 0x94
#define MAX77714_WD_RST_WK BIT(5)
/* Interrupts */
enum {
MAX77714_IRQ_TOP_ONOFF,
MAX77714_IRQ_TOP_RTC, /* Real-time clock */
MAX77714_IRQ_TOP_GPIO, /* GPIOs */
MAX77714_IRQ_TOP_LDO, /* Low-dropout regulators */
MAX77714_IRQ_TOP_SD, /* Step-down regulators */
MAX77714_IRQ_TOP_GLBL, /* "Global resources": Low-Battery, overtemp... */
};
#endif /* __LINUX_MFD_MAX77714_H_ */
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