// SPDX-License-Identifier: GPL-2.0-only /* * Maxim MAX77620 MFD Driver * * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved. * * Author: * Laxman Dewangan <[email protected]> * Chaitanya Bandi <[email protected]> * Mallikarjun Kasoju <[email protected]> */ /****************** Teminology used in driver ******************** * Here are some terminology used from datasheet for quick reference: * Flexible Power Sequence (FPS): * The Flexible Power Sequencer (FPS) allows each regulator to power up under * hardware or software control. Additionally, each regulator can power on * independently or among a group of other regulators with an adjustable * power-up and power-down delays (sequencing). GPIO1, GPIO2, and GPIO3 can * be programmed to be part of a sequence allowing external regulators to be * sequenced along with internal regulators. 32KHz clock can be programmed to * be part of a sequence. * There is 3 FPS confguration registers and all resources are configured to * any of these FPS or no FPS. */ #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/mfd/core.h> #include <linux/mfd/max77620.h> #include <linux/init.h> #include <linux/of.h> #include <linux/regmap.h> #include <linux/slab.h> static struct max77620_chip *max77620_scratch; static const struct resource gpio_resources[] = …; static const struct resource power_resources[] = …; static const struct resource rtc_resources[] = …; static const struct resource thermal_resources[] = …; static const struct regmap_irq max77620_top_irqs[] = …; static const struct mfd_cell max77620_children[] = …; static const struct mfd_cell max20024_children[] = …; static const struct mfd_cell max77663_children[] = …; static const struct regmap_range max77620_readable_ranges[] = …; static const struct regmap_access_table max77620_readable_table = …; static const struct regmap_range max20024_readable_ranges[] = …; static const struct regmap_access_table max20024_readable_table = …; static const struct regmap_range max77620_writable_ranges[] = …; static const struct regmap_access_table max77620_writable_table = …; static const struct regmap_range max77620_cacheable_ranges[] = …; static const struct regmap_access_table max77620_volatile_table = …; static const struct regmap_config max77620_regmap_config = …; static const struct regmap_config max20024_regmap_config = …; static const struct regmap_range max77663_readable_ranges[] = …; static const struct regmap_access_table max77663_readable_table = …; static const struct regmap_range max77663_writable_ranges[] = …; static const struct regmap_access_table max77663_writable_table = …; static const struct regmap_config max77663_regmap_config = …; /* * MAX77620 and MAX20024 has the following steps of the interrupt handling * for TOP interrupts: * 1. When interrupt occurs from PMIC, mask the PMIC interrupt by setting GLBLM. * 2. Read IRQTOP and service the interrupt. * 3. Once all interrupts has been checked and serviced, the interrupt service * routine un-masks the hardware interrupt line by clearing GLBLM. */ static int max77620_irq_global_mask(void *irq_drv_data) { … } static int max77620_irq_global_unmask(void *irq_drv_data) { … } static struct regmap_irq_chip max77620_top_irq_chip = …; /* max77620_get_fps_period_reg_value: Get FPS bit field value from * requested periods. * MAX77620 supports the FPS period of 40, 80, 160, 320, 540, 1280, 2560 * and 5120 microseconds. MAX20024 supports the FPS period of 20, 40, 80, * 160, 320, 540, 1280 and 2560 microseconds. * The FPS register has 3 bits field to set the FPS period as * bits max77620 max20024 * 000 40 20 * 001 80 40 * ::: */ static int max77620_get_fps_period_reg_value(struct max77620_chip *chip, int tperiod) { … } /* max77620_config_fps: Configure FPS configuration registers * based on platform specific information. */ static int max77620_config_fps(struct max77620_chip *chip, struct device_node *fps_np) { … } static int max77620_initialise_fps(struct max77620_chip *chip) { … } static int max77620_read_es_version(struct max77620_chip *chip) { … } static void max77620_pm_power_off(void) { … } static int max77620_probe(struct i2c_client *client) { … } static int max77620_set_fps_period(struct max77620_chip *chip, int fps_id, int time_period) { … } static int max77620_i2c_suspend(struct device *dev) { … } static int max77620_i2c_resume(struct device *dev) { … } static const struct i2c_device_id max77620_id[] = …; static DEFINE_SIMPLE_DEV_PM_OPS(max77620_pm_ops, max77620_i2c_suspend, max77620_i2c_resume); static struct i2c_driver max77620_driver = …; builtin_i2c_driver(…) …;
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