Re: [RESEND PATCH v11 2/2] mfd: max597x: Add support for MAX5970 and MAX5978

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ping

Regards,
Naresh Solanki



9elements GmbH, Kortumstraße 19-21, 44787 Bochum, Germany
Email:  naresh.solanki@xxxxxxxxxxxxx
Mobile:  +91 9538631477

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On Thu, 24 Nov 2022 at 16:32, Naresh Solanki
<naresh.solanki@xxxxxxxxxxxxx> wrote:
>
> From: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
>
> Implement a regulator driver with IRQ support for fault management.
> Written against documentation [1] and [2] and tested on real hardware.
>
> Every channel has its own regulator supplies nammed 'vss1-supply' and
> 'vss2-supply'. The regulator supply is used to determine the output
> voltage, as the smart switch provides no output regulation.
> The driver requires the 'shunt-resistor-micro-ohms' property to be
> present in Device Tree to properly calculate current related
> values.
>
> Datasheet links:
> 1: https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf
> 2: https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf
>
> Signed-off-by: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> Co-developed-by: Marcello Sylvester Bauer <sylv@xxxxxxx>
> Signed-off-by: Marcello Sylvester Bauer <sylv@xxxxxxx>
> Co-developed-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> ---
>  drivers/mfd/Kconfig         |  12 +++++
>  drivers/mfd/Makefile        |   1 +
>  drivers/mfd/max597x.c       |  93 +++++++++++++++++++++++++++++++++
>  include/linux/mfd/max597x.h | 101 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 207 insertions(+)
>  create mode 100644 drivers/mfd/max597x.c
>  create mode 100644 include/linux/mfd/max597x.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 8b93856de432..416fe7986b7b 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -253,6 +253,18 @@ config MFD_MADERA_SPI
>           Support for the Cirrus Logic Madera platform audio SoC
>           core functionality controlled via SPI.
>
> +config MFD_MAX597X
> +       tristate "Maxim 597x Power Switch and Monitor"
> +       depends on I2C
> +       depends on OF
> +       select MFD_CORE
> +       select REGMAP_I2C
> +       help
> +         This driver controls a Maxim 5970/5978 switch via I2C bus.
> +         The MAX5970/5978 is a smart switch with no output regulation, but
> +         fault protection and voltage and current monitoring capabilities.
> +         Also it supports upto 4 indication LEDs.
> +
>  config MFD_CS47L15
>         bool "Cirrus Logic CS47L15"
>         select PINCTRL_CS47L15
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 7ed3ef4a698c..819d711fa748 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -161,6 +161,7 @@ obj-$(CONFIG_MFD_DA9063)    += da9063.o
>  obj-$(CONFIG_MFD_DA9150)       += da9150-core.o
>
>  obj-$(CONFIG_MFD_MAX14577)     += max14577.o
> +obj-$(CONFIG_MFD_MAX597X)      += max597x.o
>  obj-$(CONFIG_MFD_MAX77620)     += max77620.o
>  obj-$(CONFIG_MFD_MAX77650)     += max77650.o
>  obj-$(CONFIG_MFD_MAX77686)     += max77686.o
> diff --git a/drivers/mfd/max597x.c b/drivers/mfd/max597x.c
> new file mode 100644
> index 000000000000..45838413f24a
> --- /dev/null
> +++ b/drivers/mfd/max597x.c
> @@ -0,0 +1,93 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Maxim MAX5970/MAX5978 Power Switch & Monitor
> + *
> + * Copyright (c) 2022 9elements GmbH
> + *
> + * Author: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/max597x.h>
> +#include <linux/regmap.h>
> +
> +static const struct regmap_config max597x_regmap_config = {
> +       .reg_bits = 8,
> +       .val_bits = 8,
> +       .max_register = MAX_REGISTERS,
> +};
> +
> +static const struct mfd_cell max597x_cells[] = {
> +       { .name = "max597x-regulator", },
> +       { .name = "max597x-iio", },
> +       { .name = "max597x-led", },
> +};
> +
> +static int max597x_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
> +{
> +       struct max597x_data *ddata;
> +       enum max597x_chip_type chip = id->driver_data;
> +
> +       ddata = devm_kzalloc(&i2c->dev, sizeof(*ddata), GFP_KERNEL);
> +       if (!ddata)
> +               return -ENOMEM;
> +
> +       /*
> +        * Based on chip type, Initialize the number of switch. This is needed by
> +        * regulator & iio cells.
> +        */
> +       switch (chip) {
> +       case MAX597x_TYPE_MAX5970:
> +               ddata->num_switches = MAX5970_NUM_SWITCHES;
> +               break;
> +       case MAX597x_TYPE_MAX5978:
> +               ddata->num_switches = MAX5978_NUM_SWITCHES;
> +               break;
> +       }
> +
> +       ddata->regmap = devm_regmap_init_i2c(i2c, &max597x_regmap_config);
> +       if (IS_ERR(ddata->regmap)) {
> +               dev_err(&i2c->dev, "Failed to initialize regmap");
> +               return PTR_ERR(ddata->regmap);
> +       }
> +
> +       /* IRQ used by regulator cell */
> +       ddata->irq = i2c->irq;
> +       ddata->dev = &i2c->dev;
> +       i2c_set_clientdata(i2c, ddata);
> +
> +       return devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_AUTO,
> +                                   max597x_cells, ARRAY_SIZE(max597x_cells),
> +                                   NULL, 0, NULL);
> +}
> +
> +static const struct i2c_device_id max597x_table[] = {
> +       { .name = "max5970", MAX597x_TYPE_MAX5970 },
> +       { .name = "max5978", MAX597x_TYPE_MAX5978 },
> +       {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, max597x_table);
> +
> +static const struct of_device_id max597x_of_match[] = {
> +       { .compatible = "maxim,max5970" },
> +       { .compatible = "maxim,max5978" },
> +       {}
> +};
> +
> +MODULE_DEVICE_TABLE(of, max597x_of_match);
> +
> +static struct i2c_driver max597x_driver = {
> +       .id_table = max597x_table,
> +       .driver = {
> +                 .name = "max597x",
> +                 .of_match_table = of_match_ptr(max597x_of_match),
> +                 },
> +       .probe = max597x_probe,
> +};
> +module_i2c_driver(max597x_driver);
> +
> +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("MAX597X Power Switch and Monitor");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/max597x.h b/include/linux/mfd/max597x.h
> new file mode 100644
> index 000000000000..706eff9c50a4
> --- /dev/null
> +++ b/include/linux/mfd/max597x.h
> @@ -0,0 +1,101 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Maxim MAX5970/MAX5978 Power Switch & Monitor
> + *
> + * Copyright (c) 2022 9elements GmbH
> + *
> + * Author: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> + */
> +
> +#ifndef MFD_MAX597X_H
> +#define MFD_MAX597X_H
> +
> +#include <linux/device.h>
> +#include <linux/regmap.h>
> +
> +#define MAX5970_NUM_SWITCHES 2
> +#define MAX5978_NUM_SWITCHES 1
> +#define MAX597X_NUM_LEDS     4
> +
> +enum max597x_chip_type {
> +       MAX597x_TYPE_MAX5978 = 1,
> +       MAX597x_TYPE_MAX5970,
> +};
> +
> +#define MAX5970_REG_CURRENT_L(ch)              (0x01 + (ch) * 4)
> +#define MAX5970_REG_CURRENT_H(ch)              (0x00 + (ch) * 4)
> +#define MAX5970_REG_VOLTAGE_L(ch)              (0x03 + (ch) * 4)
> +#define MAX5970_REG_VOLTAGE_H(ch)              (0x02 + (ch) * 4)
> +#define MAX5970_REG_MON_RANGE                  0x18
> +#define  MAX5970_MON_MASK                              0x3
> +#define  MAX5970_MON(reg, ch)          (((reg) >> ((ch) * 2)) & MAX5970_MON_MASK)
> +#define  MAX5970_MON_MAX_RANGE_UV              16000000
> +
> +#define MAX5970_REG_CH_UV_WARN_H(ch)   (0x1A + (ch) * 10)
> +#define MAX5970_REG_CH_UV_WARN_L(ch)   (0x1B + (ch) * 10)
> +#define MAX5970_REG_CH_UV_CRIT_H(ch)   (0x1C + (ch) * 10)
> +#define MAX5970_REG_CH_UV_CRIT_L(ch)   (0x1D + (ch) * 10)
> +#define MAX5970_REG_CH_OV_WARN_H(ch)   (0x1E + (ch) * 10)
> +#define MAX5970_REG_CH_OV_WARN_L(ch)   (0x1F + (ch) * 10)
> +#define MAX5970_REG_CH_OV_CRIT_H(ch)   (0x20 + (ch) * 10)
> +#define MAX5970_REG_CH_OV_CRIT_L(ch)   (0x21 + (ch) * 10)
> +
> +#define  MAX5970_VAL2REG_H(x)                  (((x) >> 2) & 0xFF)
> +#define  MAX5970_VAL2REG_L(x)                  ((x) & 0x3)
> +
> +#define MAX5970_REG_DAC_FAST(ch)               (0x2E + (ch))
> +
> +#define MAX5970_FAST2SLOW_RATIO                        200
> +
> +#define MAX5970_REG_STATUS0                            0x31
> +#define  MAX5970_CB_IFAULTF(ch)                        (1 << (ch))
> +#define  MAX5970_CB_IFAULTS(ch)                        (1 << ((ch) + 4))
> +
> +#define MAX5970_REG_STATUS1                            0x32
> +#define  STATUS1_PROT_MASK                             0x3
> +#define  STATUS1_PROT(reg) \
> +       (((reg) >> 6) & STATUS1_PROT_MASK)
> +#define  STATUS1_PROT_SHUTDOWN                 0
> +#define  STATUS1_PROT_CLEAR_PG                 1
> +#define  STATUS1_PROT_ALERT_ONLY               2
> +
> +#define MAX5970_REG_STATUS2                            0x33
> +#define  MAX5970_IRNG_MASK                             0x3
> +#define  MAX5970_IRNG(reg, ch) \
> +                                               (((reg) >> ((ch) * 2)) & MAX5970_IRNG_MASK)
> +
> +#define MAX5970_REG_STATUS3                            0x34
> +#define  MAX5970_STATUS3_ALERT                 BIT(4)
> +#define  MAX5970_STATUS3_PG(ch)                        BIT(ch)
> +
> +#define MAX5970_REG_FAULT0                             0x35
> +#define  UV_STATUS_WARN(ch)                            BIT(ch)
> +#define  UV_STATUS_CRIT(ch)                            BIT(ch + 4)
> +
> +#define MAX5970_REG_FAULT1                             0x36
> +#define  OV_STATUS_WARN(ch)                            BIT(ch)
> +#define  OV_STATUS_CRIT(ch)                            BIT(ch + 4)
> +
> +#define MAX5970_REG_FAULT2                             0x37
> +#define  OC_STATUS_WARN(ch)                            BIT(ch)
> +
> +#define MAX5970_REG_CHXEN                              0x3b
> +#define  CHXEN(ch)                                             (3 << (ch * 2))
> +
> +#define MAX5970_REG_LED_FLASH                  0x43
> +
> +#define MAX_REGISTERS                                  0x49
> +#define ADC_MASK                                               0x3FF
> +
> +struct max597x_data {
> +       struct device *dev;
> +       int irq;
> +       int num_switches;
> +       struct regmap *regmap;
> +       /* Chip specific parameters needed by regulator & iio cells */
> +       u32 irng[MAX5970_NUM_SWITCHES];
> +       u32 mon_rng[MAX5970_NUM_SWITCHES];
> +       u32 shunt_micro_ohms[MAX5970_NUM_SWITCHES];
> +};
> +
> +#endif
> --
> 2.37.3
>




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