Merge tag 'ib-mfd-gpio-input-leds-power-v5.2' of...

Merge tag 'ib-mfd-gpio-input-leds-power-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into next

Sync up with MFD tree to bring in MAX77650 PMIC driver.

Documentation/devicetree/bindings/input/max77650-onkey.txt

+Onkey driver for MAX77650 PMIC from Maxim Integrated.
+
+This module is part of the MAX77650 MFD device. For more details
+see Documentation/devicetree/bindings/mfd/max77650.txt.
+
+The onkey controller is represented as a sub-node of the PMIC node on
+the device tree.
+
+Required properties:
+--------------------
+- compatible:		Must be "maxim,max77650-onkey".
+
+Optional properties:
+- linux,code:		The key-code to be reported when the key is pressed.
+			Defaults to KEY_POWER.
+- maxim,onkey-slide:	The system's button is a slide switch, not the default
+			push button.
+
+Example:
+--------
+
+	onkey {
+		compatible = "maxim,max77650-onkey";
+		linux,code = <KEY_END>;
+		maxim,onkey-slide;
+	};

Documentation/devicetree/bindings/leds/leds-max77650.txt

+LED driver for MAX77650 PMIC from Maxim Integrated.
+
+This module is part of the MAX77650 MFD device. For more details
+see Documentation/devicetree/bindings/mfd/max77650.txt.
+
+The LED controller is represented as a sub-node of the PMIC node on
+the device tree.
+
+This device has three current sinks.
+
+Required properties:
+--------------------
+- compatible:		Must be "maxim,max77650-led"
+- #address-cells:	Must be <1>.
+- #size-cells:		Must be <0>.
+
+Each LED is represented as a sub-node of the LED-controller node. Up to
+three sub-nodes can be defined.
+
+Required properties of the sub-node:
+------------------------------------
+
+- reg:			Must be <0>, <1> or <2>.
+
+Optional properties of the sub-node:
+------------------------------------
+
+- label:		See Documentation/devicetree/bindings/leds/common.txt
+- linux,default-trigger: See Documentation/devicetree/bindings/leds/common.txt
+
+For more details, please refer to the generic GPIO DT binding document
+<devicetree/bindings/gpio/gpio.txt>.
+
+Example:
+--------
+
+	leds {
+		compatible = "maxim,max77650-led";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		led@0 {
+			reg = <0>;
+			label = "blue:usr0";
+		};
+
+		led@1 {
+			reg = <1>;
+			label = "red:usr1";
+			linux,default-trigger = "heartbeat";
+		};
+
+		led@2 {
+			reg = <2>;
+			label = "green:usr2";
+		};
+	};

Documentation/devicetree/bindings/mfd/max77650.txt

+MAX77650 ultra low-power PMIC from Maxim Integrated.
+
+Required properties:
+-------------------
+- compatible:		Must be "maxim,max77650"
+- reg:			I2C device address.
+- interrupts:		The interrupt on the parent the controller is
+			connected to.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells:	Must be <2>.
+
+- gpio-controller:	Marks the device node as a gpio controller.
+- #gpio-cells:		Must be <2>. The first cell is the pin number and
+			the second cell is used to specify the gpio active
+			state.
+
+Optional properties:
+--------------------
+gpio-line-names:	Single string containing the name of the GPIO line.
+
+The GPIO-controller module is represented as part of the top-level PMIC
+node. The device exposes a single GPIO line.
+
+For device-tree bindings of other sub-modules (regulator, power supply,
+LEDs and onkey) refer to the binding documents under the respective
+sub-system directories.
+
+For more details on GPIO bindings, please refer to the generic GPIO DT
+binding document <devicetree/bindings/gpio/gpio.txt>.
+
+Example:
+--------
+
+	pmic@48 {
+		compatible = "maxim,max77650";
+		reg = <0x48>;
+
+		interrupt-controller;
+		interrupt-parent = <&gpio2>;
+		#interrupt-cells = <2>;
+		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "max77650-charger";
+	};

Documentation/devicetree/bindings/power/supply/max77650-charger.txt

+Battery charger driver for MAX77650 PMIC from Maxim Integrated.
+
+This module is part of the MAX77650 MFD device. For more details
+see Documentation/devicetree/bindings/mfd/max77650.txt.
+
+The charger is represented as a sub-node of the PMIC node on the device tree.
+
+Required properties:
+--------------------
+- compatible:		Must be "maxim,max77650-charger"
+
+Optional properties:
+--------------------
+- input-voltage-min-microvolt:	Minimum CHGIN regulation voltage. Must be one
+				of: 4000000, 4100000, 4200000, 4300000,
+				4400000, 4500000, 4600000, 4700000.
+- input-current-limit-microamp:	CHGIN input current limit (in microamps). Must
+				be one of: 95000, 190000, 285000, 380000,
+				475000.
+
+Example:
+--------
+
+	charger {
+		compatible = "maxim,max77650-charger";
+		input-voltage-min-microvolt = <4200000>;
+		input-current-limit-microamp = <285000>;
+	};

MAINTAINERS

@@ -9408,6 +9408,20 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/sound/max9860.txt
 F:	sound/soc/codecs/max9860.*
 
+MAXIM MAX77650 PMIC MFD DRIVER
+M:	Bartosz Golaszewski <bgolaszewski@baylibre.com>
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/*/*max77650.txt
+F:	Documentation/devicetree/bindings/*/max77650*.txt
+F:	include/linux/mfd/max77650.h
+F:	drivers/mfd/max77650.c
+F:	drivers/regulator/max77650-regulator.c
+F:	drivers/power/supply/max77650-charger.c
+F:	drivers/input/misc/max77650-onkey.c
+F:	drivers/leds/leds-max77650.c
+F:	drivers/gpio/gpio-max77650.c
+
 MAXIM MAX77802 PMIC REGULATOR DEVICE DRIVER
 M:	Javier Martinez Canillas <javier@dowhile0.org>
 L:	linux-kernel@vger.kernel.org

drivers/gpio/Kconfig

@@ -1112,6 +1112,13 @@ config GPIO_MAX77620
 	  driver also provides interrupt support for each of the gpios.
 	  Say yes here to enable the max77620 to be used as gpio controller.
 
+config GPIO_MAX77650
+	tristate "Maxim MAX77650/77651 GPIO support"
+	depends on MFD_MAX77650
+	help
+	  GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
+	  These chips have a single pin that can be configured as GPIO.
+
 config GPIO_MSIC
 	bool "Intel MSIC mixed signal gpio support"
 	depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC

drivers/gpio/Makefile

@@ -80,6 +80,7 @@ obj-$(CONFIG_GPIO_MAX7300)	+= gpio-max7300.o
 obj-$(CONFIG_GPIO_MAX7301)	+= gpio-max7301.o
 obj-$(CONFIG_GPIO_MAX732X)	+= gpio-max732x.o
 obj-$(CONFIG_GPIO_MAX77620)	+= gpio-max77620.o
+obj-$(CONFIG_GPIO_MAX77650)	+= gpio-max77650.o
 obj-$(CONFIG_GPIO_MB86S7X)	+= gpio-mb86s7x.o
 obj-$(CONFIG_GPIO_MENZ127)	+= gpio-menz127.o
 obj-$(CONFIG_GPIO_MERRIFIELD)	+= gpio-merrifield.o

drivers/gpio/gpio-max77650.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// GPIO driver for MAXIM 77650/77651 charger/power-supply.
+
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77650_GPIO_DIR_MASK		BIT(0)
+#define MAX77650_GPIO_INVAL_MASK	BIT(1)
+#define MAX77650_GPIO_DRV_MASK		BIT(2)
+#define MAX77650_GPIO_OUTVAL_MASK	BIT(3)
+#define MAX77650_GPIO_DEBOUNCE_MASK	BIT(4)
+
+#define MAX77650_GPIO_DIR_OUT		0x00
+#define MAX77650_GPIO_DIR_IN		BIT(0)
+#define MAX77650_GPIO_OUT_LOW		0x00
+#define MAX77650_GPIO_OUT_HIGH		BIT(3)
+#define MAX77650_GPIO_DRV_OPEN_DRAIN	0x00
+#define MAX77650_GPIO_DRV_PUSH_PULL	BIT(2)
+#define MAX77650_GPIO_DEBOUNCE		BIT(4)
+
+#define MAX77650_GPIO_DIR_BITS(_reg) \
+		((_reg) & MAX77650_GPIO_DIR_MASK)
+#define MAX77650_GPIO_INVAL_BITS(_reg) \
+		(((_reg) & MAX77650_GPIO_INVAL_MASK) >> 1)
+
+struct max77650_gpio_chip {
+	struct regmap *map;
+	struct gpio_chip gc;
+	int irq;
+};
+
+static int max77650_gpio_direction_input(struct gpio_chip *gc,
+					 unsigned int offset)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+
+	return regmap_update_bits(chip->map,
+				  MAX77650_REG_CNFG_GPIO,
+				  MAX77650_GPIO_DIR_MASK,
+				  MAX77650_GPIO_DIR_IN);
+}
+
+static int max77650_gpio_direction_output(struct gpio_chip *gc,
+					  unsigned int offset, int value)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+	int mask, regval;
+
+	mask = MAX77650_GPIO_DIR_MASK | MAX77650_GPIO_OUTVAL_MASK;
+	regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
+	regval |= MAX77650_GPIO_DIR_OUT;
+
+	return regmap_update_bits(chip->map,
+				  MAX77650_REG_CNFG_GPIO, mask, regval);
+}
+
+static void max77650_gpio_set_value(struct gpio_chip *gc,
+				    unsigned int offset, int value)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+	int rv, regval;
+
+	regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
+
+	rv = regmap_update_bits(chip->map, MAX77650_REG_CNFG_GPIO,
+				MAX77650_GPIO_OUTVAL_MASK, regval);
+	if (rv)
+		dev_err(gc->parent, "cannot set GPIO value: %d\n", rv);
+}
+
+static int max77650_gpio_get_value(struct gpio_chip *gc,
+				   unsigned int offset)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+	unsigned int val;
+	int rv;
+
+	rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
+	if (rv)
+		return rv;
+
+	return MAX77650_GPIO_INVAL_BITS(val);
+}
+
+static int max77650_gpio_get_direction(struct gpio_chip *gc,
+				       unsigned int offset)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+	unsigned int val;
+	int rv;
+
+	rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
+	if (rv)
+		return rv;
+
+	return MAX77650_GPIO_DIR_BITS(val);
+}
+
+static int max77650_gpio_set_config(struct gpio_chip *gc,
+				    unsigned int offset, unsigned long cfg)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+
+	switch (pinconf_to_config_param(cfg)) {
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		return regmap_update_bits(chip->map,
+					  MAX77650_REG_CNFG_GPIO,
+					  MAX77650_GPIO_DRV_MASK,
+					  MAX77650_GPIO_DRV_OPEN_DRAIN);
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+		return regmap_update_bits(chip->map,
+					  MAX77650_REG_CNFG_GPIO,
+					  MAX77650_GPIO_DRV_MASK,
+					  MAX77650_GPIO_DRV_PUSH_PULL);
+	case PIN_CONFIG_INPUT_DEBOUNCE:
+		return regmap_update_bits(chip->map,
+					  MAX77650_REG_CNFG_GPIO,
+					  MAX77650_GPIO_DEBOUNCE_MASK,
+					  MAX77650_GPIO_DEBOUNCE);
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+static int max77650_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
+{
+	struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
+
+	return chip->irq;
+}
+
+static int max77650_gpio_probe(struct platform_device *pdev)
+{
+	struct max77650_gpio_chip *chip;
+	struct device *dev, *parent;
+	struct i2c_client *i2c;
+
+	dev = &pdev->dev;
+	parent = dev->parent;
+	i2c = to_i2c_client(parent);
+
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->map = dev_get_regmap(parent, NULL);
+	if (!chip->map)
+		return -ENODEV;
+
+	chip->irq = platform_get_irq_byname(pdev, "GPI");
+	if (chip->irq < 0)
+		return chip->irq;
+
+	chip->gc.base = -1;
+	chip->gc.ngpio = 1;
+	chip->gc.label = i2c->name;
+	chip->gc.parent = dev;
+	chip->gc.owner = THIS_MODULE;
+	chip->gc.can_sleep = true;
+
+	chip->gc.direction_input = max77650_gpio_direction_input;
+	chip->gc.direction_output = max77650_gpio_direction_output;
+	chip->gc.set = max77650_gpio_set_value;
+	chip->gc.get = max77650_gpio_get_value;
+	chip->gc.get_direction = max77650_gpio_get_direction;
+	chip->gc.set_config = max77650_gpio_set_config;
+	chip->gc.to_irq = max77650_gpio_to_irq;
+
+	return devm_gpiochip_add_data(dev, &chip->gc, chip);
+}
+
+static struct platform_driver max77650_gpio_driver = {
+	.driver = {
+		.name = "max77650-gpio",
+	},
+	.probe = max77650_gpio_probe,
+};
+module_platform_driver(max77650_gpio_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");

drivers/input/misc/Kconfig

@@ -190,6 +190,15 @@ config INPUT_M68K_BEEP
 	tristate "M68k Beeper support"
 	depends on M68K
 
+config INPUT_MAX77650_ONKEY
+	tristate "Maxim MAX77650 ONKEY support"
+	depends on MFD_MAX77650
+	help
+	  Support the ONKEY of the MAX77650 PMIC as an input device.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called max77650-onkey.
+
 config INPUT_MAX77693_HAPTIC
 	tristate "MAXIM MAX77693/MAX77843 haptic controller support"
 	depends on (MFD_MAX77693 || MFD_MAX77843) && PWM

drivers/input/misc/Makefile

@@ -44,6 +44,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER)	+= ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)		+= kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
+obj-$(CONFIG_INPUT_MAX77650_ONKEY)	+= max77650-onkey.o
 obj-$(CONFIG_INPUT_MAX77693_HAPTIC)	+= max77693-haptic.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)	+= max8925_onkey.o
 obj-$(CONFIG_INPUT_MAX8997_HAPTIC)	+= max8997_haptic.o

drivers/input/misc/max77650-onkey.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77650_ONKEY_MODE_MASK	BIT(3)
+#define MAX77650_ONKEY_MODE_PUSH	0x00
+#define MAX77650_ONKEY_MODE_SLIDE	BIT(3)
+
+struct max77650_onkey {
+	struct input_dev *input;
+	unsigned int code;
+};
+
+static irqreturn_t max77650_onkey_falling(int irq, void *data)
+{
+	struct max77650_onkey *onkey = data;
+
+	input_report_key(onkey->input, onkey->code, 0);
+	input_sync(onkey->input);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t max77650_onkey_rising(int irq, void *data)
+{
+	struct max77650_onkey *onkey = data;
+
+	input_report_key(onkey->input, onkey->code, 1);
+	input_sync(onkey->input);
+
+	return IRQ_HANDLED;
+}
+
+static int max77650_onkey_probe(struct platform_device *pdev)
+{
+	int irq_r, irq_f, error, mode;
+	struct max77650_onkey *onkey;
+	struct device *dev, *parent;
+	struct regmap *map;
+	unsigned int type;
+
+	dev = &pdev->dev;
+	parent = dev->parent;
+
+	map = dev_get_regmap(parent, NULL);
+	if (!map)
+		return -ENODEV;
+
+	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
+	if (!onkey)
+		return -ENOMEM;
+
+	error = device_property_read_u32(dev, "linux,code", &onkey->code);
+	if (error)
+		onkey->code = KEY_POWER;
+
+	if (device_property_read_bool(dev, "maxim,onkey-slide")) {
+		mode = MAX77650_ONKEY_MODE_SLIDE;
+		type = EV_SW;
+	} else {
+		mode = MAX77650_ONKEY_MODE_PUSH;
+		type = EV_KEY;
+	}
+
+	error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
+				   MAX77650_ONKEY_MODE_MASK, mode);
+	if (error)
+		return error;
+
+	irq_f = platform_get_irq_byname(pdev, "nEN_F");
+	if (irq_f < 0)
+		return irq_f;
+
+	irq_r = platform_get_irq_byname(pdev, "nEN_R");
+	if (irq_r < 0)
+		return irq_r;
+
+	onkey->input = devm_input_allocate_device(dev);
+	if (!onkey->input)
+		return -ENOMEM;
+
+	onkey->input->name = "max77650_onkey";
+	onkey->input->phys = "max77650_onkey/input0";
+	onkey->input->id.bustype = BUS_I2C;
+	input_set_capability(onkey->input, type, onkey->code);
+
+	error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
+					     IRQF_ONESHOT, "onkey-down", onkey);
+	if (error < 0)
+		return error;
+
+	error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
+					     IRQF_ONESHOT, "onkey-up", onkey);
+	if (error < 0)
+		return error;
+
+	return input_register_device(onkey->input);
+}
+
+static struct platform_driver max77650_onkey_driver = {
+	.driver = {
+		.name = "max77650-onkey",
+	},
+	.probe = max77650_onkey_probe,
+};
+module_platform_driver(max77650_onkey_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");

drivers/leds/Kconfig

@@ -608,6 +608,12 @@ config LEDS_TLC591XX
 	  This option enables support for Texas Instruments TLC59108
 	  and TLC59116 LED controllers.
 
+config LEDS_MAX77650
+	tristate "LED support for Maxim MAX77650 PMIC"
+	depends on LEDS_CLASS && MFD_MAX77650
+	help
+	  LEDs driver for MAX77650 family of PMICs from Maxim Integrated.
+
 config LEDS_MAX77693
 	tristate "LED support for MAX77693 Flash"
 	depends on LEDS_CLASS_FLASH

drivers/leds/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_LEDS_MC13783)		+= leds-mc13783.o
 obj-$(CONFIG_LEDS_NS2)			+= leds-ns2.o
 obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
 obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
+obj-$(CONFIG_LEDS_MAX77650)		+= leds-max77650.o
 obj-$(CONFIG_LEDS_MAX77693)		+= leds-max77693.o
 obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o

drivers/leds/leds-max77650.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// LED driver for MAXIM 77650/77651 charger/power-supply.
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77650_LED_NUM_LEDS		3
+
+#define MAX77650_LED_A_BASE		0x40
+#define MAX77650_LED_B_BASE		0x43
+
+#define MAX77650_LED_BR_MASK		GENMASK(4, 0)
+#define MAX77650_LED_EN_MASK		GENMASK(7, 6)
+
+#define MAX77650_LED_MAX_BRIGHTNESS	MAX77650_LED_BR_MASK
+
+/* Enable EN_LED_MSTR. */
+#define MAX77650_LED_TOP_DEFAULT	BIT(0)
+
+#define MAX77650_LED_ENABLE		GENMASK(7, 6)
+#define MAX77650_LED_DISABLE		0x00
+
+#define MAX77650_LED_A_DEFAULT		MAX77650_LED_DISABLE
+/* 100% on duty */
+#define MAX77650_LED_B_DEFAULT		GENMASK(3, 0)
+
+struct max77650_led {
+	struct led_classdev cdev;
+	struct regmap *map;
+	unsigned int regA;
+	unsigned int regB;
+};
+
+static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
+{
+	return container_of(cdev, struct max77650_led, cdev);
+}
+
+static int max77650_led_brightness_set(struct led_classdev *cdev,
+				       enum led_brightness brightness)
+{
+	struct max77650_led *led = max77650_to_led(cdev);
+	int val, mask;
+
+	mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK;
+
+	if (brightness == LED_OFF)
+		val = MAX77650_LED_DISABLE;
+	else
+		val = MAX77650_LED_ENABLE | brightness;
+
+	return regmap_update_bits(led->map, led->regA, mask, val);
+}
+
+static int max77650_led_probe(struct platform_device *pdev)
+{
+	struct device_node *of_node, *child;
+	struct max77650_led *leds, *led;
+	struct device *parent;
+	struct device *dev;
+	struct regmap *map;
+	const char *label;
+	int rv, num_leds;
+	u32 reg;
+
+	dev = &pdev->dev;
+	parent = dev->parent;
+	of_node = dev->of_node;
+
+	if (!of_node)
+		return -ENODEV;
+
+	leds = devm_kcalloc(dev, sizeof(*leds),
+			    MAX77650_LED_NUM_LEDS, GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	map = dev_get_regmap(dev->parent, NULL);
+	if (!map)
+		return -ENODEV;
+
+	num_leds = of_get_child_count(of_node);
+	if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
+		return -ENODEV;
+
+	for_each_child_of_node(of_node, child) {
+		rv = of_property_read_u32(child, "reg", &reg);
+		if (rv || reg >= MAX77650_LED_NUM_LEDS)
+			return -EINVAL;
+
+		led = &leds[reg];
+		led->map = map;
+		led->regA = MAX77650_LED_A_BASE + reg;
+		led->regB = MAX77650_LED_B_BASE + reg;
+		led->cdev.brightness_set_blocking = max77650_led_brightness_set;
+		led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;
+
+		label = of_get_property(child, "label", NULL);
+		if (!label) {
+			led->cdev.name = "max77650::";
+		} else {
+			led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
+							"max77650:%s", label);
+			if (!led->cdev.name)
+				return -ENOMEM;
+		}
+
+		of_property_read_string(child, "linux,default-trigger",
+					&led->cdev.default_trigger);
+
+		rv = devm_of_led_classdev_register(dev, child, &led->cdev);
+		if (rv)
+			return rv;
+
+		rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
+		if (rv)
+			return rv;
+
+		rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
+		if (rv)
+			return rv;
+	}
+
+	return regmap_write(map,
+			    MAX77650_REG_CNFG_LED_TOP,
+			    MAX77650_LED_TOP_DEFAULT);
+}
+
+static struct platform_driver max77650_led_driver = {
+	.driver = {
+		.name = "max77650-led",
+	},
+	.probe = max77650_led_probe,
+};
+module_platform_driver(max77650_led_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");

drivers/mfd/Kconfig

@@ -733,6 +733,20 @@ config MFD_MAX77620
 	  provides common support for accessing the device; additional drivers
 	  must be enabled in order to use the functionality of the device.
 
+config MFD_MAX77650
+	tristate "Maxim MAX77650/77651 PMIC Support"
+	depends on I2C
+	depends on OF || COMPILE_TEST
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  Say Y here to add support for Maxim Semiconductor MAX77650 and
+	  MAX77651 Power Management ICs. This is the core multifunction
+	  driver for interacting with the device. The module name is
+	  'max77650'. Additional drivers can be enabled in order to use
+	  the following functionalities of the device: GPIO, regulator,
+	  charger, LED, onkey.
+
 config MFD_MAX77686
 	tristate "Maxim Semiconductor MAX77686/802 PMIC Support"
 	depends on I2C

drivers/mfd/Makefile

@@ -155,6 +155,7 @@ obj-$(CONFIG_MFD_DA9150)	+= da9150-core.o
 
 obj-$(CONFIG_MFD_MAX14577)	+= max14577.o
 obj-$(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_MAX77843)	+= max77843.o

drivers/mfd/max77650.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// Core MFD driver for MAXIM 77650/77651 charger/power-supply.
+// Programming manual: https://pdfserv.maximintegrated.com/en/an/AN6428.pdf
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#define MAX77650_INT_GPI_F_MSK		BIT(0)
+#define MAX77650_INT_GPI_R_MSK		BIT(1)
+#define MAX77650_INT_GPI_MSK \
+			(MAX77650_INT_GPI_F_MSK | MAX77650_INT_GPI_R_MSK)
+#define MAX77650_INT_nEN_F_MSK		BIT(2)
+#define MAX77650_INT_nEN_R_MSK		BIT(3)
+#define MAX77650_INT_TJAL1_R_MSK	BIT(4)
+#define MAX77650_INT_TJAL2_R_MSK	BIT(5)
+#define MAX77650_INT_DOD_R_MSK		BIT(6)
+
+#define MAX77650_INT_THM_MSK		BIT(0)
+#define MAX77650_INT_CHG_MSK		BIT(1)
+#define MAX77650_INT_CHGIN_MSK		BIT(2)
+#define MAX77650_INT_TJ_REG_MSK		BIT(3)
+#define MAX77650_INT_CHGIN_CTRL_MSK	BIT(4)
+#define MAX77650_INT_SYS_CTRL_MSK	BIT(5)
+#define MAX77650_INT_SYS_CNFG_MSK	BIT(6)
+
+#define MAX77650_INT_GLBL_OFFSET	0
+#define MAX77650_INT_CHG_OFFSET		1
+
+#define MAX77650_SBIA_LPM_MASK		BIT(5)
+#define MAX77650_SBIA_LPM_DISABLED	0x00
+
+enum {
+	MAX77650_INT_GPI,
+	MAX77650_INT_nEN_F,
+	MAX77650_INT_nEN_R,
+	MAX77650_INT_TJAL1_R,
+	MAX77650_INT_TJAL2_R,
+	MAX77650_INT_DOD_R,
+	MAX77650_INT_THM,
+	MAX77650_INT_CHG,
+	MAX77650_INT_CHGIN,
+	MAX77650_INT_TJ_REG,
+	MAX77650_INT_CHGIN_CTRL,
+	MAX77650_INT_SYS_CTRL,
+	MAX77650_INT_SYS_CNFG,
+};
+
+static const struct resource max77650_charger_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHG, "CHG"),
+	DEFINE_RES_IRQ_NAMED(MAX77650_INT_CHGIN, "CHGIN"),
+};
+
+static const struct resource max77650_gpio_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MAX77650_INT_GPI, "GPI"),
+};
+
+static const struct resource max77650_onkey_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_F, "nEN_F"),
+	DEFINE_RES_IRQ_NAMED(MAX77650_INT_nEN_R, "nEN_R"),
+};
+
+static const struct mfd_cell max77650_cells[] = {
+	{
+		.name		= "max77650-regulator",
+		.of_compatible	= "maxim,max77650-regulator",
+	}, {
+		.name		= "max77650-charger",
+		.of_compatible	= "maxim,max77650-charger",
+		.resources	= max77650_charger_resources,
+		.num_resources	= ARRAY_SIZE(max77650_charger_resources),
+	}, {
+		.name		= "max77650-gpio",
+		.of_compatible	= "maxim,max77650-gpio",
+		.resources	= max77650_gpio_resources,
+		.num_resources	= ARRAY_SIZE(max77650_gpio_resources),
+	}, {
+		.name		= "max77650-led",
+		.of_compatible	= "maxim,max77650-led",
+	}, {
+		.name		= "max77650-onkey",
+		.of_compatible	= "maxim,max77650-onkey",
+		.resources	= max77650_onkey_resources,
+		.num_resources	= ARRAY_SIZE(max77650_onkey_resources),
+	},
+};
+
+static const struct regmap_irq max77650_irqs[] = {
+	[MAX77650_INT_GPI] = {
+		.reg_offset = MAX77650_INT_GLBL_OFFSET,
+		.mask = MAX77650_INT_GPI_MSK,
+		.type = {
+			.type_falling_val = MAX77650_INT_GPI_F_MSK,
+			.type_rising_val = MAX77650_INT_GPI_R_MSK,
+			.types_supported = IRQ_TYPE_EDGE_BOTH,
+		},
+	},
+	REGMAP_IRQ_REG(MAX77650_INT_nEN_F,
+		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_F_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_nEN_R,
+		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_nEN_R_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_TJAL1_R,
+		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL1_R_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_TJAL2_R,
+		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_TJAL2_R_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_DOD_R,
+		       MAX77650_INT_GLBL_OFFSET, MAX77650_INT_DOD_R_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_THM,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_THM_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_CHG,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHG_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_CHGIN,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_TJ_REG,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_TJ_REG_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_CHGIN_CTRL,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_CHGIN_CTRL_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_SYS_CTRL,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CTRL_MSK),
+	REGMAP_IRQ_REG(MAX77650_INT_SYS_CNFG,
+		       MAX77650_INT_CHG_OFFSET, MAX77650_INT_SYS_CNFG_MSK),
+};
+
+static const struct regmap_irq_chip max77650_irq_chip = {
+	.name			= "max77650-irq",
+	.irqs			= max77650_irqs,
+	.num_irqs		= ARRAY_SIZE(max77650_irqs),
+	.num_regs		= 2,
+	.status_base		= MAX77650_REG_INT_GLBL,
+	.mask_base		= MAX77650_REG_INTM_GLBL,
+	.type_in_mask		= true,
+	.type_invert		= true,
+	.init_ack_masked	= true,
+	.clear_on_unmask	= true,
+};
+
+static const struct regmap_config max77650_regmap_config = {
+	.name		= "max77650",
+	.reg_bits	= 8,
+	.val_bits	= 8,
+};
+
+static int max77650_i2c_probe(struct i2c_client *i2c)
+{
+	struct regmap_irq_chip_data *irq_data;
+	struct device *dev = &i2c->dev;
+	struct irq_domain *domain;
+	struct regmap *map;
+	unsigned int val;
+	int rv, id;
+
+	map = devm_regmap_init_i2c(i2c, &max77650_regmap_config);
+	if (IS_ERR(map)) {
+		dev_err(dev, "Unable to initialise I2C Regmap\n");
+		return PTR_ERR(map);
+	}
+
+	rv = regmap_read(map, MAX77650_REG_CID, &val);
+	if (rv) {
+		dev_err(dev, "Unable to read Chip ID\n");
+		return rv;
+	}
+
+	id = MAX77650_CID_BITS(val);
+	switch (id) {
+	case MAX77650_CID_77650A:
+	case MAX77650_CID_77650C:
+	case MAX77650_CID_77651A:
+	case MAX77650_CID_77651B:
+		break;
+	default:
+		dev_err(dev, "Chip not supported - ID: 0x%02x\n", id);
+		return -ENODEV;
+	}
+
+	/*
+	 * This IC has a low-power mode which reduces the quiescent current
+	 * consumption to ~5.6uA but is only suitable for systems consuming
+	 * less than ~2mA. Since this is not likely the case even on
+	 * linux-based wearables - keep the chip in normal power mode.
+	 */
+	rv = regmap_update_bits(map,
+				MAX77650_REG_CNFG_GLBL,
+				MAX77650_SBIA_LPM_MASK,
+				MAX77650_SBIA_LPM_DISABLED);
+	if (rv) {
+		dev_err(dev, "Unable to change the power mode\n");
+		return rv;
+	}
+
+	rv = devm_regmap_add_irq_chip(dev, map, i2c->irq,
+				      IRQF_ONESHOT | IRQF_SHARED, 0,
+				      &max77650_irq_chip, &irq_data);
+	if (rv) {
+		dev_err(dev, "Unable to add Regmap IRQ chip\n");
+		return rv;
+	}
+
+	domain = regmap_irq_get_domain(irq_data);
+
+	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+				    max77650_cells, ARRAY_SIZE(max77650_cells),
+				    NULL, 0, domain);
+}
+
+static const struct of_device_id max77650_of_match[] = {
+	{ .compatible = "maxim,max77650" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max77650_of_match);
+
+static struct i2c_driver max77650_i2c_driver = {
+	.driver = {
+		.name = "max77650",
+		.of_match_table = of_match_ptr(max77650_of_match),
+	},
+	.probe_new = max77650_i2c_probe,
+};
+module_i2c_driver(max77650_i2c_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 multi-function core driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");

drivers/mfd/mfd-core.c

@@ -269,6 +269,19 @@ static int mfd_add_device(struct device *parent, int id,
 	return ret;
 }
 
+/**
+ * mfd_add_devices - register child devices
+ *
+ * @parent:	Pointer to parent device.
+ * @id:		Can be PLATFORM_DEVID_AUTO to let the Platform API take care
+ *		of device numbering, or will be added to a device's cell_id.
+ * @cells:	Array of (struct mfd_cell)s describing child devices.
+ * @n_devs:	Number of child devices to register.
+ * @mem_base:	Parent register range resource for child devices.
+ * @irq_base:	Base of the range of virtual interrupt numbers allocated for
+ *		this MFD device. Unused if @domain is specified.
+ * @domain:	Interrupt domain to create mappings for hardware interrupts.
+ */
 int mfd_add_devices(struct device *parent, int id,
 		    const struct mfd_cell *cells, int n_devs,
 		    struct resource *mem_base,

drivers/power/supply/Kconfig

@@ -499,6 +499,13 @@ config CHARGER_DETECTOR_MAX14656
 	  Revision 1.2 and can be found e.g. in Kindle 4/5th generation
 	  readers and certain LG devices.
 
+config CHARGER_MAX77650
+	tristate "Maxim MAX77650 battery charger driver"
+	depends on MFD_MAX77650
+	help
+	  Say Y to enable support for the battery charger control of MAX77650
+	  PMICs.
+
 config CHARGER_MAX77693
 	tristate "Maxim MAX77693 battery charger driver"
 	depends on MFD_MAX77693

drivers/power/supply/Makefile

@@ -70,6 +70,7 @@ obj-$(CONFIG_CHARGER_MANAGER)	+= charger-manager.o
 obj-$(CONFIG_CHARGER_LTC3651)	+= ltc3651-charger.o
 obj-$(CONFIG_CHARGER_MAX14577)	+= max14577_charger.o
 obj-$(CONFIG_CHARGER_DETECTOR_MAX14656)	+= max14656_charger_detector.o
+obj-$(CONFIG_CHARGER_MAX77650)	+= max77650-charger.o
 obj-$(CONFIG_CHARGER_MAX77693)	+= max77693_charger.o
 obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o

drivers/power/supply/max77650-charger.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max77650.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+#define MAX77650_CHARGER_ENABLED		BIT(0)
+#define MAX77650_CHARGER_DISABLED		0x00
+#define MAX77650_CHARGER_CHG_EN_MASK		BIT(0)
+
+#define MAX77650_CHG_DETAILS_MASK		GENMASK(7, 4)
+#define MAX77650_CHG_DETAILS_BITS(_reg) \
+		(((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
+
+/* Charger is OFF. */
+#define MAX77650_CHG_OFF			0x00
+/* Charger is in prequalification mode. */
+#define MAX77650_CHG_PREQ			0x01
+/* Charger is in fast-charge constant current mode. */
+#define MAX77650_CHG_ON_CURR			0x02
+/* Charger is in JEITA modified fast-charge constant-current mode. */
+#define MAX77650_CHG_ON_CURR_JEITA		0x03
+/* Charger is in fast-charge constant-voltage mode. */
+#define MAX77650_CHG_ON_VOLT			0x04
+/* Charger is in JEITA modified fast-charge constant-voltage mode. */
+#define MAX77650_CHG_ON_VOLT_JEITA		0x05
+/* Charger is in top-off mode. */
+#define MAX77650_CHG_ON_TOPOFF			0x06
+/* Charger is in JEITA modified top-off mode. */
+#define MAX77650_CHG_ON_TOPOFF_JEITA		0x07
+/* Charger is done. */
+#define MAX77650_CHG_DONE			0x08
+/* Charger is JEITA modified done. */
+#define MAX77650_CHG_DONE_JEITA			0x09
+/* Charger is suspended due to a prequalification timer fault. */
+#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT	0x0a
+/* Charger is suspended due to a fast-charge timer fault. */
+#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT	0x0b
+/* Charger is suspended due to a battery temperature fault. */
+#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT	0x0c
+
+#define MAX77650_CHGIN_DETAILS_MASK		GENMASK(3, 2)
+#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
+		(((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
+
+#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT	0x00
+#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT	0x01
+#define MAX77650_CHGIN_OKAY			0x11
+
+#define MAX77650_CHARGER_CHG_MASK	BIT(1)
+#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
+		(((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
+
+#define MAX77650_CHARGER_VCHGIN_MIN_MASK	0xc0
+#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val)	((_val) << 5)
+
+#define MAX77650_CHARGER_ICHGIN_LIM_MASK	0x1c
+#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val)	((_val) << 2)
+
+struct max77650_charger_data {
+	struct regmap *map;
+	struct device *dev;
+};
+
+static enum power_supply_property max77650_charger_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_CHARGE_TYPE
+};
+
+static const unsigned int max77650_charger_vchgin_min_table[] = {
+	4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
+};
+
+static const unsigned int max77650_charger_ichgin_lim_table[] = {
+	95000, 190000, 285000, 380000, 475000
+};
+
+static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
+					   unsigned int val)
+{
+	int i, rv;
+
+	for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
+		if (val == max77650_charger_vchgin_min_table[i]) {
+			rv = regmap_update_bits(chg->map,
+					MAX77650_REG_CNFG_CHG_B,
+					MAX77650_CHARGER_VCHGIN_MIN_MASK,
+					MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
+			if (rv)
+				return rv;
+
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
+					   unsigned int val)
+{
+	int i, rv;
+
+	for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
+		if (val == max77650_charger_ichgin_lim_table[i]) {
+			rv = regmap_update_bits(chg->map,
+					MAX77650_REG_CNFG_CHG_B,
+					MAX77650_CHARGER_ICHGIN_LIM_MASK,
+					MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
+			if (rv)
+				return rv;
+
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int max77650_charger_enable(struct max77650_charger_data *chg)
+{
+	int rv;
+
+	rv = regmap_update_bits(chg->map,
+				MAX77650_REG_CNFG_CHG_B,
+				MAX77650_CHARGER_CHG_EN_MASK,
+				MAX77650_CHARGER_ENABLED);
+	if (rv)
+		dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
+
+	return rv;
+}
+
+static int max77650_charger_disable(struct max77650_charger_data *chg)
+{
+	int rv;
+
+	rv = regmap_update_bits(chg->map,
+				MAX77650_REG_CNFG_CHG_B,
+				MAX77650_CHARGER_CHG_EN_MASK,
+				MAX77650_CHARGER_DISABLED);
+	if (rv)
+		dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
+
+	return rv;
+}
+
+static irqreturn_t max77650_charger_check_status(int irq, void *data)
+{
+	struct max77650_charger_data *chg = data;
+	int rv, reg;
+
+	rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
+	if (rv) {
+		dev_err(chg->dev,
+			"unable to read the charger status: %d\n", rv);
+		return IRQ_HANDLED;
+	}
+
+	switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
+	case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
+		dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
+		max77650_charger_disable(chg);
+		break;
+	case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
+		dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
+		max77650_charger_disable(chg);
+		break;
+	case MAX77650_CHGIN_OKAY:
+		max77650_charger_enable(chg);
+		break;
+	default:
+		/* May be 0x10 - debouncing */
+		break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int max77650_charger_get_property(struct power_supply *psy,
+					 enum power_supply_property psp,
+					 union power_supply_propval *val)
+{
+	struct max77650_charger_data *chg = power_supply_get_drvdata(psy);
+	int rv, reg;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
+		if (rv)
+			return rv;
+
+		if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+		}
+
+		switch (MAX77650_CHG_DETAILS_BITS(reg)) {
+		case MAX77650_CHG_OFF:
+		case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
+		case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
+		case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+			break;
+		case MAX77650_CHG_PREQ:
+		case MAX77650_CHG_ON_CURR:
+		case MAX77650_CHG_ON_CURR_JEITA:
+		case MAX77650_CHG_ON_VOLT:
+		case MAX77650_CHG_ON_VOLT_JEITA:
+		case MAX77650_CHG_ON_TOPOFF:
+		case MAX77650_CHG_ON_TOPOFF_JEITA:
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+		case MAX77650_CHG_DONE:
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+		}
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
+		if (rv)
+			return rv;
+
+		val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, &reg);
+		if (rv)
+			return rv;
+
+		if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+			break;
+		}
+
+		switch (MAX77650_CHG_DETAILS_BITS(reg)) {
+		case MAX77650_CHG_PREQ:
+		case MAX77650_CHG_ON_CURR:
+		case MAX77650_CHG_ON_CURR_JEITA:
+		case MAX77650_CHG_ON_VOLT:
+		case MAX77650_CHG_ON_VOLT_JEITA:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
+			break;
+		case MAX77650_CHG_ON_TOPOFF:
+		case MAX77650_CHG_ON_TOPOFF_JEITA:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct power_supply_desc max77650_battery_desc = {
+	.name		= "max77650",
+	.type		= POWER_SUPPLY_TYPE_USB,
+	.get_property	= max77650_charger_get_property,
+	.properties	= max77650_charger_properties,
+	.num_properties	= ARRAY_SIZE(max77650_charger_properties),
+};
+
+static int max77650_charger_probe(struct platform_device *pdev)
+{
+	struct power_supply_config pscfg = {};
+	struct max77650_charger_data *chg;
+	struct power_supply *battery;
+	struct device *dev, *parent;
+	int rv, chg_irq, chgin_irq;
+	unsigned int prop;
+
+	dev = &pdev->dev;
+	parent = dev->parent;
+
+	chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
+	if (!chg)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, chg);
+
+	chg->map = dev_get_regmap(parent, NULL);
+	if (!chg->map)
+		return -ENODEV;
+
+	chg->dev = dev;
+
+	pscfg.of_node = dev->of_node;
+	pscfg.drv_data = chg;
+
+	chg_irq = platform_get_irq_byname(pdev, "CHG");
+	if (chg_irq < 0)
+		return chg_irq;
+
+	chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
+	if (chgin_irq < 0)
+		return chgin_irq;
+
+	rv = devm_request_any_context_irq(dev, chg_irq,
+					  max77650_charger_check_status,
+					  IRQF_ONESHOT, "chg", chg);
+	if (rv < 0)
+		return rv;
+
+	rv = devm_request_any_context_irq(dev, chgin_irq,
+					  max77650_charger_check_status,
+					  IRQF_ONESHOT, "chgin", chg);
+	if (rv < 0)
+		return rv;
+
+	battery = devm_power_supply_register(dev,
+					     &max77650_battery_desc, &pscfg);
+	if (IS_ERR(battery))
+		return PTR_ERR(battery);
+
+	rv = of_property_read_u32(dev->of_node,
+				  "input-voltage-min-microvolt", &prop);
+	if (rv == 0) {
+		rv = max77650_charger_set_vchgin_min(chg, prop);
+		if (rv)
+			return rv;
+	}
+
+	rv = of_property_read_u32(dev->of_node,
+				  "input-current-limit-microamp", &prop);
+	if (rv == 0) {
+		rv = max77650_charger_set_ichgin_lim(chg, prop);
+		if (rv)
+			return rv;
+	}
+
+	return max77650_charger_enable(chg);
+}
+
+static int max77650_charger_remove(struct platform_device *pdev)
+{
+	struct max77650_charger_data *chg = platform_get_drvdata(pdev);
+
+	return max77650_charger_disable(chg);
+}
+
+static struct platform_driver max77650_charger_driver = {
+	.driver = {
+		.name = "max77650-charger",
+	},
+	.probe = max77650_charger_probe,
+	.remove = max77650_charger_remove,
+};
+module_platform_driver(max77650_charger_driver);
+
+MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_LICENSE("GPL v2");

include/linux/mfd/max77650.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 BayLibre SAS
+ * Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+ *
+ * Common definitions for MAXIM 77650/77651 charger/power-supply.
+ */
+
+#ifndef MAX77650_H
+#define MAX77650_H
+
+#include <linux/bits.h>
+
+#define MAX77650_REG_INT_GLBL		0x00
+#define MAX77650_REG_INT_CHG		0x01
+#define MAX77650_REG_STAT_CHG_A		0x02
+#define MAX77650_REG_STAT_CHG_B		0x03
+#define MAX77650_REG_ERCFLAG		0x04
+#define MAX77650_REG_STAT_GLBL		0x05
+#define MAX77650_REG_INTM_GLBL		0x06
+#define MAX77650_REG_INTM_CHG		0x07
+#define MAX77650_REG_CNFG_GLBL		0x10
+#define MAX77650_REG_CID		0x11
+#define MAX77650_REG_CNFG_GPIO		0x12
+#define MAX77650_REG_CNFG_CHG_A		0x18
+#define MAX77650_REG_CNFG_CHG_B		0x19
+#define MAX77650_REG_CNFG_CHG_C		0x1a
+#define MAX77650_REG_CNFG_CHG_D		0x1b
+#define MAX77650_REG_CNFG_CHG_E		0x1c
+#define MAX77650_REG_CNFG_CHG_F		0x1d
+#define MAX77650_REG_CNFG_CHG_G		0x1e
+#define MAX77650_REG_CNFG_CHG_H		0x1f
+#define MAX77650_REG_CNFG_CHG_I		0x20
+#define MAX77650_REG_CNFG_SBB_TOP	0x28
+#define MAX77650_REG_CNFG_SBB0_A	0x29
+#define MAX77650_REG_CNFG_SBB0_B	0x2a
+#define MAX77650_REG_CNFG_SBB1_A	0x2b
+#define MAX77650_REG_CNFG_SBB1_B	0x2c
+#define MAX77650_REG_CNFG_SBB2_A	0x2d
+#define MAX77650_REG_CNFG_SBB2_B	0x2e
+#define MAX77650_REG_CNFG_LDO_A		0x38
+#define MAX77650_REG_CNFG_LDO_B		0x39
+#define MAX77650_REG_CNFG_LED0_A	0x40
+#define MAX77650_REG_CNFG_LED1_A	0x41
+#define MAX77650_REG_CNFG_LED2_A	0x42
+#define MAX77650_REG_CNFG_LED0_B	0x43
+#define MAX77650_REG_CNFG_LED1_B	0x44
+#define MAX77650_REG_CNFG_LED2_B	0x45
+#define MAX77650_REG_CNFG_LED_TOP	0x46
+
+#define MAX77650_CID_MASK		GENMASK(3, 0)
+#define MAX77650_CID_BITS(_reg)		(_reg & MAX77650_CID_MASK)
+
+#define MAX77650_CID_77650A		0x03
+#define MAX77650_CID_77650C		0x0a
+#define MAX77650_CID_77651A		0x06
+#define MAX77650_CID_77651B		0x08
+
+#endif /* MAX77650_H */