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    Subject[RESEND PATCH v6 06/11] mfd: max77650: new core mfd driver
    Date
    From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

    Add the core mfd driver for max77650 PMIC. We define five sub-devices
    for which the drivers will be added in subsequent patches.

    Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
    ---
    drivers/mfd/Kconfig | 14 +++
    drivers/mfd/Makefile | 1 +
    drivers/mfd/max77650.c | 234 +++++++++++++++++++++++++++++++++++
    include/linux/mfd/max77650.h | 59 +++++++++
    4 files changed, 308 insertions(+)
    create mode 100644 drivers/mfd/max77650.c
    create mode 100644 include/linux/mfd/max77650.h

    diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
    index 0ce2d8dfc5f1..ade04e124aa0 100644
    --- a/drivers/mfd/Kconfig
    +++ b/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
    diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
    index b4569ed7f3f3..5727d099c16f 100644
    --- a/drivers/mfd/Makefile
    +++ b/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
    diff --git a/drivers/mfd/max77650.c b/drivers/mfd/max77650.c
    new file mode 100644
    index 000000000000..7a6c0a5cf602
    --- /dev/null
    +++ b/drivers/mfd/max77650.c
    @@ -0,0 +1,234 @@
    +// 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;
    +
    + map = devm_regmap_init_i2c(i2c, &max77650_regmap_config);
    + if (IS_ERR(map)) {
    + dev_err(dev, "unable to initialize i2c regmap\n");
    + return PTR_ERR(map);
    + }
    +
    + rv = regmap_read(map, MAX77650_REG_CID, &val);
    + if (rv) {
    + dev_err(dev, "unable to read the CID from device\n");
    + return rv;
    + }
    +
    + switch (MAX77650_CID_BITS(val)) {
    + case MAX77650_CID_77650A:
    + case MAX77650_CID_77650C:
    + case MAX77650_CID_77651A:
    + case MAX77650_CID_77651B:
    + break;
    + default:
    + 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 the 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");
    diff --git a/include/linux/mfd/max77650.h b/include/linux/mfd/max77650.h
    new file mode 100644
    index 000000000000..c809e211a8cd
    --- /dev/null
    +++ b/include/linux/mfd/max77650.h
    @@ -0,0 +1,59 @@
    +/* 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 */
    --
    2.20.1
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