drivers/mfd/max77620.c - linux/kernel/git/bpf/bpf-next - Git at Google

 /*
  * Maxim MAX77620 MFD Driver
  *
  * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
  *
  * Author:
  *	Laxman Dewangan <ldewangan@nvidia.com>
  *	Chaitanya Bandi <bandik@nvidia.com>
  *	Mallikarjun Kasoju <mkasoju@nvidia.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 /****************** 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/of_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 static const struct resource gpio_resources[] = {
 	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
 };

 static const struct resource power_resources[] = {
 	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_MBATLOW),
 };

 static const struct resource rtc_resources[] = {
 	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_RTC),
 };

 static const struct resource thermal_resources[] = {
 	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM1),
 	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM2),
 };

 static const struct regmap_irq max77620_top_irqs[] = {
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GLBL, 0, MAX77620_IRQ_TOP_GLBL_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_SD, 0, MAX77620_IRQ_TOP_SD_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_LDO, 0, MAX77620_IRQ_TOP_LDO_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GPIO, 0, MAX77620_IRQ_TOP_GPIO_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_RTC, 0, MAX77620_IRQ_TOP_RTC_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_32K, 0, MAX77620_IRQ_TOP_32K_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_ONOFF, 0, MAX77620_IRQ_TOP_ONOFF_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_MBATLOW, 1, MAX77620_IRQ_LBM_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM1, 1, MAX77620_IRQ_TJALRM1_MASK),
 	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM2, 1, MAX77620_IRQ_TJALRM2_MASK),
 };

 static const struct mfd_cell max77620_children[] = {
 	{ .name = "max77620-pinctrl", },
 	{ .name = "max77620-clock", },
 	{ .name = "max77620-pmic", },
 	{ .name = "max77620-watchdog", },
 	{
 		.name = "max77620-gpio",
 		.resources = gpio_resources,
 		.num_resources = ARRAY_SIZE(gpio_resources),
 	}, {
 		.name = "max77620-rtc",
 		.resources = rtc_resources,
 		.num_resources = ARRAY_SIZE(rtc_resources),
 	}, {
 		.name = "max77620-power",
 		.resources = power_resources,
 		.num_resources = ARRAY_SIZE(power_resources),
 	}, {
 		.name = "max77620-thermal",
 		.resources = thermal_resources,
 		.num_resources = ARRAY_SIZE(thermal_resources),
 	},
 };

 static const struct mfd_cell max20024_children[] = {
 	{ .name = "max20024-pinctrl", },
 	{ .name = "max77620-clock", },
 	{ .name = "max20024-pmic", },
 	{ .name = "max77620-watchdog", },
 	{
 		.name = "max77620-gpio",
 		.resources = gpio_resources,
 		.num_resources = ARRAY_SIZE(gpio_resources),
 	}, {
 		.name = "max77620-rtc",
 		.resources = rtc_resources,
 		.num_resources = ARRAY_SIZE(rtc_resources),
 	}, {
 		.name = "max20024-power",
 		.resources = power_resources,
 		.num_resources = ARRAY_SIZE(power_resources),
 	},
 };

 static const struct regmap_range max77620_readable_ranges[] = {
 	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 };

 static const struct regmap_access_table max77620_readable_table = {
 	.yes_ranges = max77620_readable_ranges,
 	.n_yes_ranges = ARRAY_SIZE(max77620_readable_ranges),
 };

 static const struct regmap_range max20024_readable_ranges[] = {
 	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 	regmap_reg_range(MAX20024_REG_MAX_ADD, MAX20024_REG_MAX_ADD),
 };

 static const struct regmap_access_table max20024_readable_table = {
 	.yes_ranges = max20024_readable_ranges,
 	.n_yes_ranges = ARRAY_SIZE(max20024_readable_ranges),
 };

 static const struct regmap_range max77620_writable_ranges[] = {
 	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 };

 static const struct regmap_access_table max77620_writable_table = {
 	.yes_ranges = max77620_writable_ranges,
 	.n_yes_ranges = ARRAY_SIZE(max77620_writable_ranges),
 };

 static const struct regmap_range max77620_cacheable_ranges[] = {
 	regmap_reg_range(MAX77620_REG_SD0_CFG, MAX77620_REG_LDO_CFG3),
 	regmap_reg_range(MAX77620_REG_FPS_CFG0, MAX77620_REG_FPS_SD3),
 };

 static const struct regmap_access_table max77620_volatile_table = {
 	.no_ranges = max77620_cacheable_ranges,
 	.n_no_ranges = ARRAY_SIZE(max77620_cacheable_ranges),
 };

 static const struct regmap_config max77620_regmap_config = {
 	.name = "power-slave",
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = MAX77620_REG_DVSSD4 + 1,
 	.cache_type = REGCACHE_RBTREE,
 	.rd_table = &max77620_readable_table,
 	.wr_table = &max77620_writable_table,
 	.volatile_table = &max77620_volatile_table,
 };

 static const struct regmap_config max20024_regmap_config = {
 	.name = "power-slave",
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = MAX20024_REG_MAX_ADD + 1,
 	.cache_type = REGCACHE_RBTREE,
 	.rd_table = &max20024_readable_table,
 	.wr_table = &max77620_writable_table,
 	.volatile_table = &max77620_volatile_table,
 };

 /*
  * 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)
 {
 	struct max77620_chip *chip = irq_drv_data;
 	int ret;

 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
 				 MAX77620_GLBLM_MASK, MAX77620_GLBLM_MASK);
 	if (ret < 0)
 		dev_err(chip->dev, "Failed to set GLBLM: %d\n", ret);

 	return ret;
 }

 static int max77620_irq_global_unmask(void *irq_drv_data)
 {
 	struct max77620_chip *chip = irq_drv_data;
 	int ret;

 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
 				 MAX77620_GLBLM_MASK, 0);
 	if (ret < 0)
 		dev_err(chip->dev, "Failed to reset GLBLM: %d\n", ret);

 	return ret;
 }

 static struct regmap_irq_chip max77620_top_irq_chip = {
 	.name = "max77620-top",
 	.irqs = max77620_top_irqs,
 	.num_irqs = ARRAY_SIZE(max77620_top_irqs),
 	.num_regs = 2,
 	.status_base = MAX77620_REG_IRQTOP,
 	.mask_base = MAX77620_REG_IRQTOPM,
 	.handle_pre_irq = max77620_irq_global_mask,
 	.handle_post_irq = max77620_irq_global_unmask,
 };

 /* 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)
 {
 	int fps_min_period;
 	int i;

 	switch (chip->chip_id) {
 	case MAX20024:
 		fps_min_period = MAX20024_FPS_PERIOD_MIN_US;
 		break;
 	case MAX77620:
 		fps_min_period = MAX77620_FPS_PERIOD_MIN_US;
 		break;
 	default:
 		return -EINVAL;
 	}

 	for (i = 0; i < 7; i++) {
 		if (fps_min_period >= tperiod)
 			return i;
 		fps_min_period *= 2;
 	}

 	return i;
 }

 /* 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)
 {
 	struct device *dev = chip->dev;
 	unsigned int mask = 0, config = 0;
 	u32 fps_max_period;
 	u32 param_val;
 	int tperiod, fps_id;
 	int ret;
 	char fps_name[10];

 	switch (chip->chip_id) {
 	case MAX20024:
 		fps_max_period = MAX20024_FPS_PERIOD_MAX_US;
 		break;
 	case MAX77620:
 		fps_max_period = MAX77620_FPS_PERIOD_MAX_US;
 		break;
 	default:
 		return -EINVAL;
 	}

 	for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
 		sprintf(fps_name, "fps%d", fps_id);
 		if (!strcmp(fps_np->name, fps_name))
 			break;
 	}

 	if (fps_id == MAX77620_FPS_COUNT) {
 		dev_err(dev, "FPS node name %s is not valid\n", fps_np->name);
 		return -EINVAL;
 	}

 	ret = of_property_read_u32(fps_np, "maxim,shutdown-fps-time-period-us",
 				   &param_val);
 	if (!ret) {
 		mask |= MAX77620_FPS_TIME_PERIOD_MASK;
 		chip->shutdown_fps_period[fps_id] = min(param_val,
 							fps_max_period);
 		tperiod = max77620_get_fps_period_reg_value(chip,
 				chip->shutdown_fps_period[fps_id]);
 		config |= tperiod << MAX77620_FPS_TIME_PERIOD_SHIFT;
 	}

 	ret = of_property_read_u32(fps_np, "maxim,suspend-fps-time-period-us",
 				   &param_val);
 	if (!ret)
 		chip->suspend_fps_period[fps_id] = min(param_val,
 						       fps_max_period);

 	ret = of_property_read_u32(fps_np, "maxim,fps-event-source",
 				   &param_val);
 	if (!ret) {
 		if (param_val > 2) {
 			dev_err(dev, "FPS%d event-source invalid\n", fps_id);
 			return -EINVAL;
 		}
 		mask |= MAX77620_FPS_EN_SRC_MASK;
 		config |= param_val << MAX77620_FPS_EN_SRC_SHIFT;
 		if (param_val == 2) {
 			mask |= MAX77620_FPS_ENFPS_SW_MASK;
 			config |= MAX77620_FPS_ENFPS_SW;
 		}
 	}

 	if (!chip->sleep_enable && !chip->enable_global_lpm) {
 		ret = of_property_read_u32(fps_np,
 				"maxim,device-state-on-disabled-event",
 				&param_val);
 		if (!ret) {
 			if (param_val == 0)
 				chip->sleep_enable = true;
 			else if (param_val == 1)
 				chip->enable_global_lpm = true;
 		}
 	}

 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
 				 mask, config);
 	if (ret < 0) {
 		dev_err(dev, "Failed to update FPS CFG: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int max77620_initialise_fps(struct max77620_chip *chip)
 {
 	struct device *dev = chip->dev;
 	struct device_node *fps_np, *fps_child;
 	u8 config;
 	int fps_id;
 	int ret;

 	for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
 		chip->shutdown_fps_period[fps_id] = -1;
 		chip->suspend_fps_period[fps_id] = -1;
 	}

 	fps_np = of_get_child_by_name(dev->of_node, "fps");
 	if (!fps_np)
 		goto skip_fps;

 	for_each_child_of_node(fps_np, fps_child) {
 		ret = max77620_config_fps(chip, fps_child);
 		if (ret < 0)
 			return ret;
 	}

 	config = chip->enable_global_lpm ? MAX77620_ONOFFCNFG2_SLP_LPM_MSK : 0;
 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 				 MAX77620_ONOFFCNFG2_SLP_LPM_MSK, config);
 	if (ret < 0) {
 		dev_err(dev, "Failed to update SLP_LPM: %d\n", ret);
 		return ret;
 	}

 skip_fps:
 	/* Enable wake on EN0 pin */
 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 				 MAX77620_ONOFFCNFG2_WK_EN0,
 				 MAX77620_ONOFFCNFG2_WK_EN0);
 	if (ret < 0) {
 		dev_err(dev, "Failed to update WK_EN0: %d\n", ret);
 		return ret;
 	}

 	/* For MAX20024, SLPEN will be POR reset if CLRSE is b11 */
 	if ((chip->chip_id == MAX20024) && chip->sleep_enable) {
 		config = MAX77620_ONOFFCNFG1_SLPEN | MAX20024_ONOFFCNFG1_CLRSE;
 		ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 					 config, config);
 		if (ret < 0) {
 			dev_err(dev, "Failed to update SLPEN: %d\n", ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int max77620_read_es_version(struct max77620_chip *chip)
 {
 	unsigned int val;
 	u8 cid_val[6];
 	int i;
 	int ret;

 	for (i = MAX77620_REG_CID0; i <= MAX77620_REG_CID5; i++) {
 		ret = regmap_read(chip->rmap, i, &val);
 		if (ret < 0) {
 			dev_err(chip->dev, "Failed to read CID: %d\n", ret);
 			return ret;
 		}
 		dev_dbg(chip->dev, "CID%d: 0x%02x\n",
 			i - MAX77620_REG_CID0, val);
 		cid_val[i - MAX77620_REG_CID0] = val;
 	}

 	/* CID4 is OTP Version  and CID5 is ES version */
 	dev_info(chip->dev, "PMIC Version OTP:0x%02X and ES:0x%X\n",
 		 cid_val[4], MAX77620_CID5_DIDM(cid_val[5]));

 	return ret;
 }

 static int max77620_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
 	const struct regmap_config *rmap_config;
 	struct max77620_chip *chip;
 	const struct mfd_cell *mfd_cells;
 	int n_mfd_cells;
 	int ret;

 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	i2c_set_clientdata(client, chip);
 	chip->dev = &client->dev;
 	chip->irq_base = -1;
 	chip->chip_irq = client->irq;
 	chip->chip_id = (enum max77620_chip_id)id->driver_data;

 	switch (chip->chip_id) {
 	case MAX77620:
 		mfd_cells = max77620_children;
 		n_mfd_cells = ARRAY_SIZE(max77620_children);
 		rmap_config = &max77620_regmap_config;
 		break;
 	case MAX20024:
 		mfd_cells = max20024_children;
 		n_mfd_cells = ARRAY_SIZE(max20024_children);
 		rmap_config = &max20024_regmap_config;
 		break;
 	default:
 		dev_err(chip->dev, "ChipID is invalid %d\n", chip->chip_id);
 		return -EINVAL;
 	}

 	chip->rmap = devm_regmap_init_i2c(client, rmap_config);
 	if (IS_ERR(chip->rmap)) {
 		ret = PTR_ERR(chip->rmap);
 		dev_err(chip->dev, "Failed to initialise regmap: %d\n", ret);
 		return ret;
 	}

 	ret = max77620_read_es_version(chip);
 	if (ret < 0)
 		return ret;

 	max77620_top_irq_chip.irq_drv_data = chip;
 	ret = devm_regmap_add_irq_chip(chip->dev, chip->rmap, client->irq,
 				       IRQF_ONESHOT | IRQF_SHARED,
 				       chip->irq_base, &max77620_top_irq_chip,
 				       &chip->top_irq_data);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to add regmap irq: %d\n", ret);
 		return ret;
 	}

 	ret = max77620_initialise_fps(chip);
 	if (ret < 0)
 		return ret;

 	ret =  devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE,
 				    mfd_cells, n_mfd_cells, NULL, 0,
 				    regmap_irq_get_domain(chip->top_irq_data));
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to add MFD children: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int max77620_set_fps_period(struct max77620_chip *chip,
 				   int fps_id, int time_period)
 {
 	int period = max77620_get_fps_period_reg_value(chip, time_period);
 	int ret;

 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
 				 MAX77620_FPS_TIME_PERIOD_MASK,
 				 period << MAX77620_FPS_TIME_PERIOD_SHIFT);
 	if (ret < 0) {
 		dev_err(chip->dev, "Failed to update FPS period: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int max77620_i2c_suspend(struct device *dev)
 {
 	struct max77620_chip *chip = dev_get_drvdata(dev);
 	struct i2c_client *client = to_i2c_client(dev);
 	unsigned int config;
 	int fps;
 	int ret;

 	for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
 		if (chip->suspend_fps_period[fps] < 0)
 			continue;

 		ret = max77620_set_fps_period(chip, fps,
 					      chip->suspend_fps_period[fps]);
 		if (ret < 0)
 			return ret;
 	}

 	/*
 	 * For MAX20024: No need to configure SLPEN on suspend as
 	 * it will be configured on Init.
 	 */
 	if (chip->chip_id == MAX20024)
 		goto out;

 	config = (chip->sleep_enable) ? MAX77620_ONOFFCNFG1_SLPEN : 0;
 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 				 MAX77620_ONOFFCNFG1_SLPEN,
 				 config);
 	if (ret < 0) {
 		dev_err(dev, "Failed to configure sleep in suspend: %d\n", ret);
 		return ret;
 	}

 	/* Disable WK_EN0 */
 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 				 MAX77620_ONOFFCNFG2_WK_EN0, 0);
 	if (ret < 0) {
 		dev_err(dev, "Failed to configure WK_EN in suspend: %d\n", ret);
 		return ret;
 	}

 out:
 	disable_irq(client->irq);

 	return 0;
 }

 static int max77620_i2c_resume(struct device *dev)
 {
 	struct max77620_chip *chip = dev_get_drvdata(dev);
 	struct i2c_client *client = to_i2c_client(dev);
 	int ret;
 	int fps;

 	for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
 		if (chip->shutdown_fps_period[fps] < 0)
 			continue;

 		ret = max77620_set_fps_period(chip, fps,
 					      chip->shutdown_fps_period[fps]);
 		if (ret < 0)
 			return ret;
 	}

 	/*
 	 * For MAX20024: No need to configure WKEN0 on resume as
 	 * it is configured on Init.
 	 */
 	if (chip->chip_id == MAX20024)
 		goto out;

 	/* Enable WK_EN0 */
 	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 				 MAX77620_ONOFFCNFG2_WK_EN0,
 				 MAX77620_ONOFFCNFG2_WK_EN0);
 	if (ret < 0) {
 		dev_err(dev, "Failed to configure WK_EN0 n resume: %d\n", ret);
 		return ret;
 	}

 out:
 	enable_irq(client->irq);

 	return 0;
 }
 #endif

 static const struct i2c_device_id max77620_id[] = {
 	{"max77620", MAX77620},
 	{"max20024", MAX20024},
 	{},
 };

 static const struct dev_pm_ops max77620_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(max77620_i2c_suspend, max77620_i2c_resume)
 };

 static struct i2c_driver max77620_driver = {
 	.driver = {
 		.name = "max77620",
 		.pm = &max77620_pm_ops,
 	},
 	.probe = max77620_probe,
 	.id_table = max77620_id,
 };
 builtin_i2c_driver(max77620_driver);
	/*
	* Maxim MAX77620 MFD Driver
	*
	* Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
	*
	* Author:
	* Laxman Dewangan <ldewangan@nvidia.com>
	* Chaitanya Bandi <bandik@nvidia.com>
	* Mallikarjun Kasoju <mkasoju@nvidia.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	/**************** 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/of_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	static const struct resource gpio_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
	};

	static const struct resource power_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_MBATLOW),
	};

	static const struct resource rtc_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_TOP_RTC),
	};

	static const struct resource thermal_resources[] = {
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM1),
	DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM2),
	};

	static const struct regmap_irq max77620_top_irqs[] = {
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GLBL, 0, MAX77620_IRQ_TOP_GLBL_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_SD, 0, MAX77620_IRQ_TOP_SD_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_LDO, 0, MAX77620_IRQ_TOP_LDO_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GPIO, 0, MAX77620_IRQ_TOP_GPIO_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_RTC, 0, MAX77620_IRQ_TOP_RTC_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_32K, 0, MAX77620_IRQ_TOP_32K_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_TOP_ONOFF, 0, MAX77620_IRQ_TOP_ONOFF_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_MBATLOW, 1, MAX77620_IRQ_LBM_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM1, 1, MAX77620_IRQ_TJALRM1_MASK),
	REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM2, 1, MAX77620_IRQ_TJALRM2_MASK),
	};

	static const struct mfd_cell max77620_children[] = {
	{ .name = "max77620-pinctrl", },
	{ .name = "max77620-clock", },
	{ .name = "max77620-pmic", },
	{ .name = "max77620-watchdog", },
	{
	.name = "max77620-gpio",
	.resources = gpio_resources,
	.num_resources = ARRAY_SIZE(gpio_resources),
	}, {
	.name = "max77620-rtc",
	.resources = rtc_resources,
	.num_resources = ARRAY_SIZE(rtc_resources),
	}, {
	.name = "max77620-power",
	.resources = power_resources,
	.num_resources = ARRAY_SIZE(power_resources),
	}, {
	.name = "max77620-thermal",
	.resources = thermal_resources,
	.num_resources = ARRAY_SIZE(thermal_resources),
	},
	};

	static const struct mfd_cell max20024_children[] = {
	{ .name = "max20024-pinctrl", },
	{ .name = "max77620-clock", },
	{ .name = "max20024-pmic", },
	{ .name = "max77620-watchdog", },
	{
	.name = "max77620-gpio",
	.resources = gpio_resources,
	.num_resources = ARRAY_SIZE(gpio_resources),
	}, {
	.name = "max77620-rtc",
	.resources = rtc_resources,
	.num_resources = ARRAY_SIZE(rtc_resources),
	}, {
	.name = "max20024-power",
	.resources = power_resources,
	.num_resources = ARRAY_SIZE(power_resources),
	},
	};

	static const struct regmap_range max77620_readable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
	};

	static const struct regmap_access_table max77620_readable_table = {
	.yes_ranges = max77620_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max77620_readable_ranges),
	};

	static const struct regmap_range max20024_readable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
	regmap_reg_range(MAX20024_REG_MAX_ADD, MAX20024_REG_MAX_ADD),
	};

	static const struct regmap_access_table max20024_readable_table = {
	.yes_ranges = max20024_readable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max20024_readable_ranges),
	};

	static const struct regmap_range max77620_writable_ranges[] = {
	regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
	};

	static const struct regmap_access_table max77620_writable_table = {
	.yes_ranges = max77620_writable_ranges,
	.n_yes_ranges = ARRAY_SIZE(max77620_writable_ranges),
	};

	static const struct regmap_range max77620_cacheable_ranges[] = {
	regmap_reg_range(MAX77620_REG_SD0_CFG, MAX77620_REG_LDO_CFG3),
	regmap_reg_range(MAX77620_REG_FPS_CFG0, MAX77620_REG_FPS_SD3),
	};

	static const struct regmap_access_table max77620_volatile_table = {
	.no_ranges = max77620_cacheable_ranges,
	.n_no_ranges = ARRAY_SIZE(max77620_cacheable_ranges),
	};

	static const struct regmap_config max77620_regmap_config = {
	.name = "power-slave",
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX77620_REG_DVSSD4 + 1,
	.cache_type = REGCACHE_RBTREE,
	.rd_table = &max77620_readable_table,
	.wr_table = &max77620_writable_table,
	.volatile_table = &max77620_volatile_table,
	};

	static const struct regmap_config max20024_regmap_config = {
	.name = "power-slave",
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX20024_REG_MAX_ADD + 1,
	.cache_type = REGCACHE_RBTREE,
	.rd_table = &max20024_readable_table,
	.wr_table = &max77620_writable_table,
	.volatile_table = &max77620_volatile_table,
	};

	/*
	* 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)
	{
	struct max77620_chip *chip = irq_drv_data;
	int ret;

	ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
	MAX77620_GLBLM_MASK, MAX77620_GLBLM_MASK);
	if (ret < 0)
	dev_err(chip->dev, "Failed to set GLBLM: %d\n", ret);

	return ret;
	}

	static int max77620_irq_global_unmask(void *irq_drv_data)
	{
	struct max77620_chip *chip = irq_drv_data;
	int ret;

	ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
	MAX77620_GLBLM_MASK, 0);
	if (ret < 0)
	dev_err(chip->dev, "Failed to reset GLBLM: %d\n", ret);

	return ret;
	}

	static struct regmap_irq_chip max77620_top_irq_chip = {
	.name = "max77620-top",
	.irqs = max77620_top_irqs,
	.num_irqs = ARRAY_SIZE(max77620_top_irqs),
	.num_regs = 2,
	.status_base = MAX77620_REG_IRQTOP,
	.mask_base = MAX77620_REG_IRQTOPM,
	.handle_pre_irq = max77620_irq_global_mask,
	.handle_post_irq = max77620_irq_global_unmask,
	};

	/* 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)
	{
	int fps_min_period;
	int i;

	switch (chip->chip_id) {
	case MAX20024:
	fps_min_period = MAX20024_FPS_PERIOD_MIN_US;
	break;
	case MAX77620:
	fps_min_period = MAX77620_FPS_PERIOD_MIN_US;
	break;
	default:
	return -EINVAL;
	}

	for (i = 0; i < 7; i++) {
	if (fps_min_period >= tperiod)
	return i;
	fps_min_period *= 2;
	}

	return i;
	}

	/* 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)
	{
	struct device *dev = chip->dev;
	unsigned int mask = 0, config = 0;
	u32 fps_max_period;
	u32 param_val;
	int tperiod, fps_id;
	int ret;
	char fps_name[10];

	switch (chip->chip_id) {
	case MAX20024:
	fps_max_period = MAX20024_FPS_PERIOD_MAX_US;
	break;
	case MAX77620:
	fps_max_period = MAX77620_FPS_PERIOD_MAX_US;
	break;
	default:
	return -EINVAL;
	}

	for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
	sprintf(fps_name, "fps%d", fps_id);
	if (!strcmp(fps_np->name, fps_name))
	break;
	}

	if (fps_id == MAX77620_FPS_COUNT) {
	dev_err(dev, "FPS node name %s is not valid\n", fps_np->name);
	return -EINVAL;
	}

	ret = of_property_read_u32(fps_np, "maxim,shutdown-fps-time-period-us",
	&param_val);
	if (!ret) {
	mask \|= MAX77620_FPS_TIME_PERIOD_MASK;
	chip->shutdown_fps_period[fps_id] = min(param_val,
	fps_max_period);
	tperiod = max77620_get_fps_period_reg_value(chip,
	chip->shutdown_fps_period[fps_id]);
	config \|= tperiod << MAX77620_FPS_TIME_PERIOD_SHIFT;
	}

	ret = of_property_read_u32(fps_np, "maxim,suspend-fps-time-period-us",
	&param_val);
	if (!ret)
	chip->suspend_fps_period[fps_id] = min(param_val,
	fps_max_period);

	ret = of_property_read_u32(fps_np, "maxim,fps-event-source",
	&param_val);
	if (!ret) {
	if (param_val > 2) {
	dev_err(dev, "FPS%d event-source invalid\n", fps_id);
	return -EINVAL;
	}
	mask \|= MAX77620_FPS_EN_SRC_MASK;
	config \|= param_val << MAX77620_FPS_EN_SRC_SHIFT;
	if (param_val == 2) {
	mask \|= MAX77620_FPS_ENFPS_SW_MASK;
	config \|= MAX77620_FPS_ENFPS_SW;
	}
	}

	if (!chip->sleep_enable && !chip->enable_global_lpm) {
	ret = of_property_read_u32(fps_np,
	"maxim,device-state-on-disabled-event",
	&param_val);
	if (!ret) {
	if (param_val == 0)
	chip->sleep_enable = true;
	else if (param_val == 1)
	chip->enable_global_lpm = true;
	}
	}

	ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
	mask, config);
	if (ret < 0) {
	dev_err(dev, "Failed to update FPS CFG: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int max77620_initialise_fps(struct max77620_chip *chip)
	{
	struct device *dev = chip->dev;
	struct device_node fps_np, fps_child;
	u8 config;
	int fps_id;
	int ret;

	for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
	chip->shutdown_fps_period[fps_id] = -1;
	chip->suspend_fps_period[fps_id] = -1;
	}

	fps_np = of_get_child_by_name(dev->of_node, "fps");
	if (!fps_np)
	goto skip_fps;

	for_each_child_of_node(fps_np, fps_child) {
	ret = max77620_config_fps(chip, fps_child);
	if (ret < 0)
	return ret;
	}

	config = chip->enable_global_lpm ? MAX77620_ONOFFCNFG2_SLP_LPM_MSK : 0;
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
	MAX77620_ONOFFCNFG2_SLP_LPM_MSK, config);
	if (ret < 0) {
	dev_err(dev, "Failed to update SLP_LPM: %d\n", ret);
	return ret;
	}

	skip_fps:
	/* Enable wake on EN0 pin */
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
	MAX77620_ONOFFCNFG2_WK_EN0,
	MAX77620_ONOFFCNFG2_WK_EN0);
	if (ret < 0) {
	dev_err(dev, "Failed to update WK_EN0: %d\n", ret);
	return ret;
	}

	/* For MAX20024, SLPEN will be POR reset if CLRSE is b11 */
	if ((chip->chip_id == MAX20024) && chip->sleep_enable) {
	config = MAX77620_ONOFFCNFG1_SLPEN \| MAX20024_ONOFFCNFG1_CLRSE;
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
	config, config);
	if (ret < 0) {
	dev_err(dev, "Failed to update SLPEN: %d\n", ret);
	return ret;
	}
	}

	return 0;
	}

	static int max77620_read_es_version(struct max77620_chip *chip)
	{
	unsigned int val;
	u8 cid_val[6];
	int i;
	int ret;

	for (i = MAX77620_REG_CID0; i <= MAX77620_REG_CID5; i++) {
	ret = regmap_read(chip->rmap, i, &val);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to read CID: %d\n", ret);
	return ret;
	}
	dev_dbg(chip->dev, "CID%d: 0x%02x\n",
	i - MAX77620_REG_CID0, val);
	cid_val[i - MAX77620_REG_CID0] = val;
	}

	/* CID4 is OTP Version and CID5 is ES version */
	dev_info(chip->dev, "PMIC Version OTP:0x%02X and ES:0x%X\n",
	cid_val[4], MAX77620_CID5_DIDM(cid_val[5]));

	return ret;
	}

	static int max77620_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	const struct regmap_config *rmap_config;
	struct max77620_chip *chip;
	const struct mfd_cell *mfd_cells;
	int n_mfd_cells;
	int ret;

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	i2c_set_clientdata(client, chip);
	chip->dev = &client->dev;
	chip->irq_base = -1;
	chip->chip_irq = client->irq;
	chip->chip_id = (enum max77620_chip_id)id->driver_data;

	switch (chip->chip_id) {
	case MAX77620:
	mfd_cells = max77620_children;
	n_mfd_cells = ARRAY_SIZE(max77620_children);
	rmap_config = &max77620_regmap_config;
	break;
	case MAX20024:
	mfd_cells = max20024_children;
	n_mfd_cells = ARRAY_SIZE(max20024_children);
	rmap_config = &max20024_regmap_config;
	break;
	default:
	dev_err(chip->dev, "ChipID is invalid %d\n", chip->chip_id);
	return -EINVAL;
	}

	chip->rmap = devm_regmap_init_i2c(client, rmap_config);
	if (IS_ERR(chip->rmap)) {
	ret = PTR_ERR(chip->rmap);
	dev_err(chip->dev, "Failed to initialise regmap: %d\n", ret);
	return ret;
	}

	ret = max77620_read_es_version(chip);
	if (ret < 0)
	return ret;

	max77620_top_irq_chip.irq_drv_data = chip;
	ret = devm_regmap_add_irq_chip(chip->dev, chip->rmap, client->irq,
	IRQF_ONESHOT \| IRQF_SHARED,
	chip->irq_base, &max77620_top_irq_chip,
	&chip->top_irq_data);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add regmap irq: %d\n", ret);
	return ret;
	}

	ret = max77620_initialise_fps(chip);
	if (ret < 0)
	return ret;

	ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE,
	mfd_cells, n_mfd_cells, NULL, 0,
	regmap_irq_get_domain(chip->top_irq_data));
	if (ret < 0) {
	dev_err(chip->dev, "Failed to add MFD children: %d\n", ret);
	return ret;
	}

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int max77620_set_fps_period(struct max77620_chip *chip,
	int fps_id, int time_period)
	{
	int period = max77620_get_fps_period_reg_value(chip, time_period);
	int ret;

	ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
	MAX77620_FPS_TIME_PERIOD_MASK,
	period << MAX77620_FPS_TIME_PERIOD_SHIFT);
	if (ret < 0) {
	dev_err(chip->dev, "Failed to update FPS period: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static int max77620_i2c_suspend(struct device *dev)
	{
	struct max77620_chip *chip = dev_get_drvdata(dev);
	struct i2c_client *client = to_i2c_client(dev);
	unsigned int config;
	int fps;
	int ret;

	for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
	if (chip->suspend_fps_period[fps] < 0)
	continue;

	ret = max77620_set_fps_period(chip, fps,
	chip->suspend_fps_period[fps]);
	if (ret < 0)
	return ret;
	}

	/*
	* For MAX20024: No need to configure SLPEN on suspend as
	* it will be configured on Init.
	*/
	if (chip->chip_id == MAX20024)
	goto out;

	config = (chip->sleep_enable) ? MAX77620_ONOFFCNFG1_SLPEN : 0;
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
	MAX77620_ONOFFCNFG1_SLPEN,
	config);
	if (ret < 0) {
	dev_err(dev, "Failed to configure sleep in suspend: %d\n", ret);
	return ret;
	}

	/* Disable WK_EN0 */
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
	MAX77620_ONOFFCNFG2_WK_EN0, 0);
	if (ret < 0) {
	dev_err(dev, "Failed to configure WK_EN in suspend: %d\n", ret);
	return ret;
	}

	out:
	disable_irq(client->irq);

	return 0;
	}

	static int max77620_i2c_resume(struct device *dev)
	{
	struct max77620_chip *chip = dev_get_drvdata(dev);
	struct i2c_client *client = to_i2c_client(dev);
	int ret;
	int fps;

	for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
	if (chip->shutdown_fps_period[fps] < 0)
	continue;

	ret = max77620_set_fps_period(chip, fps,
	chip->shutdown_fps_period[fps]);
	if (ret < 0)
	return ret;
	}

	/*
	* For MAX20024: No need to configure WKEN0 on resume as
	* it is configured on Init.
	*/
	if (chip->chip_id == MAX20024)
	goto out;

	/* Enable WK_EN0 */
	ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
	MAX77620_ONOFFCNFG2_WK_EN0,
	MAX77620_ONOFFCNFG2_WK_EN0);
	if (ret < 0) {
	dev_err(dev, "Failed to configure WK_EN0 n resume: %d\n", ret);
	return ret;
	}

	out:
	enable_irq(client->irq);

	return 0;
	}
	#endif

	static const struct i2c_device_id max77620_id[] = {
	{"max77620", MAX77620},
	{"max20024", MAX20024},
	{},
	};

	static const struct dev_pm_ops max77620_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(max77620_i2c_suspend, max77620_i2c_resume)
	};

	static struct i2c_driver max77620_driver = {
	.driver = {
	.name = "max77620",
	.pm = &max77620_pm_ops,
	},
	.probe = max77620_probe,
	.id_table = max77620_id,
	};
	builtin_i2c_driver(max77620_driver);