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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: Luca Ceresoli <luca@lucaceresoli.net> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Luca Ceresoli
Lee Jones
parent
d1f3188478
commit
60b050ff3a
@ -11695,6 +11695,8 @@ MAXIM MAX77714 PMIC MFD DRIVER
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M: Luca Ceresoli <luca@lucaceresoli.net>
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S: Maintained
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F: Documentation/devicetree/bindings/mfd/maxim,max77714.yaml
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F: drivers/mfd/max77714.c
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F: include/linux/mfd/max77714.h
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MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER
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M: Javier Martinez Canillas <javier@dowhile0.org>
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@ -849,6 +849,20 @@ config MFD_MAX77693
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additional drivers must be enabled in order to use the functionality
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of the device.
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config MFD_MAX77714
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tristate "Maxim Semiconductor MAX77714 PMIC Support"
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depends on I2C
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depends on OF || COMPILE_TEST
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select MFD_CORE
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select REGMAP_I2C
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help
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Say yes here to add support for Maxim Semiconductor MAX77714.
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This is a Power Management IC with 4 buck regulators, 9
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low-dropout regulators, 8 GPIOs, RTC, watchdog etc. This driver
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provides common support for accessing the device; additional
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drivers must be enabled in order to use each functionality of the
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device.
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config MFD_MAX77843
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bool "Maxim Semiconductor MAX77843 PMIC Support"
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depends on I2C=y
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@ -162,6 +162,7 @@ obj-$(CONFIG_MFD_MAX77620) += max77620.o
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obj-$(CONFIG_MFD_MAX77650) += max77650.o
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obj-$(CONFIG_MFD_MAX77686) += max77686.o
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obj-$(CONFIG_MFD_MAX77693) += max77693.o
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obj-$(CONFIG_MFD_MAX77714) += max77714.o
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obj-$(CONFIG_MFD_MAX77843) += max77843.o
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obj-$(CONFIG_MFD_MAX8907) += max8907.o
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max8925-objs := max8925-core.o max8925-i2c.o
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152
drivers/mfd/max77714.c
Normal file
152
drivers/mfd/max77714.c
Normal file
@ -0,0 +1,152 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Maxim MAX77714 Core Driver
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*
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* Copyright (C) 2022 Luca Ceresoli
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* Author: Luca Ceresoli <luca@lucaceresoli.net>
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max77714.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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static const struct mfd_cell max77714_cells[] = {
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{ .name = "max77714-watchdog" },
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{ .name = "max77714-rtc" },
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};
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static const struct regmap_range max77714_readable_ranges[] = {
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regmap_reg_range(MAX77714_INT_TOP, MAX77714_INT_TOP),
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regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
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regmap_reg_range(MAX77714_32K_STATUS, MAX77714_32K_CONFIG),
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regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
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};
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static const struct regmap_range max77714_writable_ranges[] = {
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regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
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regmap_reg_range(MAX77714_32K_CONFIG, MAX77714_32K_CONFIG),
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regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
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};
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static const struct regmap_access_table max77714_readable_table = {
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.yes_ranges = max77714_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(max77714_readable_ranges),
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};
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static const struct regmap_access_table max77714_writable_table = {
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.yes_ranges = max77714_writable_ranges,
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.n_yes_ranges = ARRAY_SIZE(max77714_writable_ranges),
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};
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static const struct regmap_config max77714_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX77714_CNFG2_ONOFF,
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.rd_table = &max77714_readable_table,
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.wr_table = &max77714_writable_table,
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};
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static const struct regmap_irq max77714_top_irqs[] = {
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_ONOFF, 0, MAX77714_INT_TOP_ONOFF),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_RTC, 0, MAX77714_INT_TOP_RTC),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GPIO, 0, MAX77714_INT_TOP_GPIO),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_LDO, 0, MAX77714_INT_TOP_LDO),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_SD, 0, MAX77714_INT_TOP_SD),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GLBL, 0, MAX77714_INT_TOP_GLBL),
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};
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static const struct regmap_irq_chip max77714_irq_chip = {
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.name = "max77714-pmic",
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.status_base = MAX77714_INT_TOP,
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.mask_base = MAX77714_INT_TOPM,
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.num_regs = 1,
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.irqs = max77714_top_irqs,
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.num_irqs = ARRAY_SIZE(max77714_top_irqs),
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};
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/*
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* MAX77714 initially uses the internal, low precision oscillator. Enable
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* the external oscillator by setting the XOSC_RETRY bit. If the external
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* oscillator is not OK (probably not installed) this has no effect.
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*/
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static int max77714_setup_xosc(struct device *dev, struct regmap *regmap)
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{
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/* Internal Crystal Load Capacitance, indexed by value of 32KLOAD bits */
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static const unsigned int load_cap[4] = {0, 10, 12, 22}; /* pF */
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unsigned int load_cap_idx;
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unsigned int status;
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int err;
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err = regmap_update_bits(regmap, MAX77714_32K_CONFIG,
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MAX77714_32K_CONFIG_XOSC_RETRY,
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MAX77714_32K_CONFIG_XOSC_RETRY);
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if (err)
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return dev_err_probe(dev, err, "Failed to configure the external oscillator\n");
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err = regmap_read(regmap, MAX77714_32K_STATUS, &status);
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if (err)
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return dev_err_probe(dev, err, "Failed to read external oscillator status\n");
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load_cap_idx = (status >> MAX77714_32K_STATUS_32KLOAD_SHF)
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& MAX77714_32K_STATUS_32KLOAD_MSK;
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dev_info(dev, "Using %s oscillator, %d pF load cap\n",
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status & MAX77714_32K_STATUS_32KSOURCE ? "internal" : "external",
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load_cap[load_cap_idx]);
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return 0;
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}
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static int max77714_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct regmap *regmap;
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struct regmap_irq_chip_data *irq_data;
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int err;
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regmap = devm_regmap_init_i2c(client, &max77714_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Failed to initialise regmap\n");
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err = max77714_setup_xosc(dev, regmap);
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if (err)
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return err;
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err = devm_regmap_add_irq_chip(dev, regmap, client->irq,
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IRQF_ONESHOT | IRQF_SHARED, 0,
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&max77714_irq_chip, &irq_data);
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if (err)
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return dev_err_probe(dev, err, "Failed to add PMIC IRQ chip\n");
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err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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max77714_cells, ARRAY_SIZE(max77714_cells),
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NULL, 0, NULL);
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if (err)
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return dev_err_probe(dev, err, "Failed to register child devices\n");
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return 0;
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}
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static const struct of_device_id max77714_dt_match[] = {
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{ .compatible = "maxim,max77714" },
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{},
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};
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MODULE_DEVICE_TABLE(of, max77714_dt_match);
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static struct i2c_driver max77714_driver = {
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.driver = {
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.name = "max77714",
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.of_match_table = max77714_dt_match,
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},
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.probe_new = max77714_probe,
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};
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module_i2c_driver(max77714_driver);
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MODULE_DESCRIPTION("Maxim MAX77714 MFD core driver");
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MODULE_AUTHOR("Luca Ceresoli <luca@lucaceresoli.net>");
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MODULE_LICENSE("GPL");
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60
include/linux/mfd/max77714.h
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60
include/linux/mfd/max77714.h
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@ -0,0 +1,60 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Maxim MAX77714 Register and data structures definition.
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*
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* Copyright (C) 2022 Luca Ceresoli
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* Author: Luca Ceresoli <luca@lucaceresoli.net>
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*/
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#ifndef __LINUX_MFD_MAX77714_H_
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#define __LINUX_MFD_MAX77714_H_
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#include <linux/bits.h>
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#define MAX77714_INT_TOP 0x00
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#define MAX77714_INT_TOPM 0x07 /* Datasheet says "read only", but it is RW */
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#define MAX77714_INT_TOP_ONOFF BIT(1)
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#define MAX77714_INT_TOP_RTC BIT(3)
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#define MAX77714_INT_TOP_GPIO BIT(4)
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#define MAX77714_INT_TOP_LDO BIT(5)
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#define MAX77714_INT_TOP_SD BIT(6)
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#define MAX77714_INT_TOP_GLBL BIT(7)
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#define MAX77714_32K_STATUS 0x30
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#define MAX77714_32K_STATUS_SIOSCOK BIT(5)
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#define MAX77714_32K_STATUS_XOSCOK BIT(4)
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#define MAX77714_32K_STATUS_32KSOURCE BIT(3)
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#define MAX77714_32K_STATUS_32KLOAD_MSK 0x3
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#define MAX77714_32K_STATUS_32KLOAD_SHF 1
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#define MAX77714_32K_STATUS_CRYSTAL_CFG BIT(0)
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#define MAX77714_32K_CONFIG 0x31
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#define MAX77714_32K_CONFIG_XOSC_RETRY BIT(4)
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#define MAX77714_CNFG_GLBL2 0x91
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#define MAX77714_WDTEN BIT(2)
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#define MAX77714_WDTSLPC BIT(3)
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#define MAX77714_TWD_MASK 0x3
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#define MAX77714_TWD_2s 0x0
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#define MAX77714_TWD_16s 0x1
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#define MAX77714_TWD_64s 0x2
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#define MAX77714_TWD_128s 0x3
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#define MAX77714_CNFG_GLBL3 0x92
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#define MAX77714_WDTC BIT(0)
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#define MAX77714_CNFG2_ONOFF 0x94
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#define MAX77714_WD_RST_WK BIT(5)
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/* Interrupts */
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enum {
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MAX77714_IRQ_TOP_ONOFF,
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MAX77714_IRQ_TOP_RTC, /* Real-time clock */
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MAX77714_IRQ_TOP_GPIO, /* GPIOs */
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MAX77714_IRQ_TOP_LDO, /* Low-dropout regulators */
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MAX77714_IRQ_TOP_SD, /* Step-down regulators */
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MAX77714_IRQ_TOP_GLBL, /* "Global resources": Low-Battery, overtemp... */
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};
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#endif /* __LINUX_MFD_MAX77714_H_ */
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