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Date: Sun, 5 Mar 2023 11:04:02 +0000
From: Lee Jones <lee@...nel.org>
To: Naresh Solanki <naresh.solanki@...ements.com>
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
Marcello Sylvester Bauer <sylv@...v.io>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mfd: max597x: Add support for MAX5970 and MAX5978
On Wed, 01 Mar 2023, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>
> Implement a regulator driver with IRQ support for fault management.
> Written against documentation [1] and [2] and tested on real hardware.
>
> Every channel has it's own regulator supply 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' to be present in
> the devicetree to properly calculate current related values.
>
> You must specify compatible devictree layout:
>
> regulator@3a {
> reg = <0x3a>;
> vss1-supply = <&p3v3>;
> compatible = "maxim,max5978";
>
> ...
>
> regulators {
> sw0_ref: SW0 {
> regulator-compatible = "SW0";
> shunt-resistor-micro-ohms = <12000>;
> ...
> }
> }
> }
>
> 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@...ements.com>
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
> drivers/mfd/Kconfig | 10 ++++
> drivers/mfd/simple-mfd-i2c.c | 13 +++++
> include/linux/mfd/max597x.h | 97 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 120 insertions(+)
> create mode 100644 include/linux/mfd/max597x.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index d4fc4ca9fdbd..de899e0d2f1a 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -266,6 +266,16 @@ 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 && OF)
> + select MFD_SIMPLE_MFD_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/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
> index e31f13fd6a79..20782b4dd172 100644
> --- a/drivers/mfd/simple-mfd-i2c.c
> +++ b/drivers/mfd/simple-mfd-i2c.c
> @@ -72,9 +72,22 @@ static const struct simple_mfd_data silergy_sy7636a = {
> .mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
> };
>
> +static const struct mfd_cell max597x_cells[] = {
> + { .name = "max597x-regulator", },
> + { .name = "max597x-iio", },
> + { .name = "max597x-led", },
> +};
> +
> +static const struct simple_mfd_data maxim_max597x = {
> + .mfd_cell = max597x_cells,
> + .mfd_cell_size = ARRAY_SIZE(max597x_cells),
> +};
> +
> static const struct of_device_id simple_mfd_i2c_of_match[] = {
> { .compatible = "kontron,sl28cpld" },
> { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
> + { .compatible = "maxim,max5970", .data = &maxim_max597x},
> + { .compatible = "maxim,max5978", .data = &maxim_max597x},
> {}
> };
> MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
> diff --git a/include/linux/mfd/max597x.h b/include/linux/mfd/max597x.h
> new file mode 100644
> index 000000000000..8a4da98caf3e
> --- /dev/null
> +++ b/include/linux/mfd/max597x.h
> @@ -0,0 +1,97 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Device driver for regulators in MAX5970 and MAX5978 IC
> + *
> + * Copyright (c) 2022 9elements GmbH
> + *
> + * Author: Patrick Rudolph <patrick.rudolph@...ements.com>
> + */
> +
> +#ifndef _MAX597X_H
> +#define _MAX597X_H
__MFD_*
> +#include <linux/regmap.h>
> +
> +#define MAX5970_NUM_SWITCHES 2
> +#define MAX5978_NUM_SWITCHES 1
> +#define MAX597X_NUM_LEDS 4
> +
> +struct max597x_data {
> + int num_switches;
> + u32 irng[MAX5970_NUM_SWITCHES];
> + u32 mon_rng[MAX5970_NUM_SWITCHES];
> + u32 shunt_micro_ohms[MAX5970_NUM_SWITCHES];
> +};
> +
> +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)
Why the '\n'?
> +#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) (1 << (ch))
> +#define UV_STATUS_CRIT(ch) (1 << ((ch) + 4))
> +
> +#define MAX5970_REG_FAULT1 0x36
> +#define OV_STATUS_WARN(ch) (1 << (ch))
> +#define OV_STATUS_CRIT(ch) (1 << ((ch) + 4))
> +
> +#define MAX5970_REG_FAULT2 0x37
> +#define OC_STATUS_WARN(ch) (1 << (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
> +
> +#endif /* _MAX597X_H */
> --
> 2.39.1
>
--
Lee Jones [李琼斯]
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