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0742c2a633
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
...
Changes in V12:
- Use simple_mfd_i2c driver and remove previous implementation.
- Remove newline
- Use _MFD_MAX597X_H in header file
- Successfull build need following patch from regulator:
https://lore.kernel.org/r/20230216075302.68935-1-Naresh.Solanki@9elements.com
https://lore.kernel.org/r/20230210163225.1208035-1-Naresh.Solanki@9elements.com
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230307121246.127425-2-Naresh.Solanki@9elements.com
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Device driver for regulators in MAX5970 and MAX5978 IC
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*
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* Copyright (c) 2022 9elements GmbH
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*
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* Author: Patrick Rudolph <patrick.rudolph@9elements.com>
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*/
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#ifndef _MFD_MAX597X_H
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#define _MFD_MAX597X_H
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#include <linux/regmap.h>
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#define MAX5970_NUM_SWITCHES 2
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#define MAX5978_NUM_SWITCHES 1
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#define MAX597X_NUM_LEDS 4
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struct max597x_data {
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int num_switches;
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u32 irng[MAX5970_NUM_SWITCHES];
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u32 mon_rng[MAX5970_NUM_SWITCHES];
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u32 shunt_micro_ohms[MAX5970_NUM_SWITCHES];
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};
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enum max597x_chip_type {
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MAX597x_TYPE_MAX5978 = 1,
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MAX597x_TYPE_MAX5970,
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};
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#define MAX5970_REG_CURRENT_L(ch) (0x01 + (ch) * 4)
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#define MAX5970_REG_CURRENT_H(ch) (0x00 + (ch) * 4)
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#define MAX5970_REG_VOLTAGE_L(ch) (0x03 + (ch) * 4)
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#define MAX5970_REG_VOLTAGE_H(ch) (0x02 + (ch) * 4)
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#define MAX5970_REG_MON_RANGE 0x18
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#define MAX5970_MON_MASK 0x3
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#define MAX5970_MON(reg, ch) (((reg) >> ((ch) * 2)) & MAX5970_MON_MASK)
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#define MAX5970_MON_MAX_RANGE_UV 16000000
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#define MAX5970_REG_CH_UV_WARN_H(ch) (0x1A + (ch) * 10)
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#define MAX5970_REG_CH_UV_WARN_L(ch) (0x1B + (ch) * 10)
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#define MAX5970_REG_CH_UV_CRIT_H(ch) (0x1C + (ch) * 10)
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#define MAX5970_REG_CH_UV_CRIT_L(ch) (0x1D + (ch) * 10)
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#define MAX5970_REG_CH_OV_WARN_H(ch) (0x1E + (ch) * 10)
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#define MAX5970_REG_CH_OV_WARN_L(ch) (0x1F + (ch) * 10)
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#define MAX5970_REG_CH_OV_CRIT_H(ch) (0x20 + (ch) * 10)
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#define MAX5970_REG_CH_OV_CRIT_L(ch) (0x21 + (ch) * 10)
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#define MAX5970_VAL2REG_H(x) (((x) >> 2) & 0xFF)
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#define MAX5970_VAL2REG_L(x) ((x) & 0x3)
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#define MAX5970_REG_DAC_FAST(ch) (0x2E + (ch))
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#define MAX5970_FAST2SLOW_RATIO 200
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#define MAX5970_REG_STATUS0 0x31
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#define MAX5970_CB_IFAULTF(ch) (1 << (ch))
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#define MAX5970_CB_IFAULTS(ch) (1 << ((ch) + 4))
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#define MAX5970_REG_STATUS1 0x32
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#define STATUS1_PROT_MASK 0x3
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#define STATUS1_PROT(reg) \
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(((reg) >> 6) & STATUS1_PROT_MASK)
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#define STATUS1_PROT_SHUTDOWN 0
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#define STATUS1_PROT_CLEAR_PG 1
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#define STATUS1_PROT_ALERT_ONLY 2
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#define MAX5970_REG_STATUS2 0x33
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#define MAX5970_IRNG_MASK 0x3
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#define MAX5970_IRNG(reg, ch) \
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(((reg) >> ((ch) * 2)) & MAX5970_IRNG_MASK)
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#define MAX5970_REG_STATUS3 0x34
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#define MAX5970_STATUS3_ALERT BIT(4)
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#define MAX5970_STATUS3_PG(ch) BIT(ch)
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#define MAX5970_REG_FAULT0 0x35
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#define UV_STATUS_WARN(ch) (1 << (ch))
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#define UV_STATUS_CRIT(ch) (1 << ((ch) + 4))
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#define MAX5970_REG_FAULT1 0x36
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#define OV_STATUS_WARN(ch) (1 << (ch))
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#define OV_STATUS_CRIT(ch) (1 << ((ch) + 4))
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#define MAX5970_REG_FAULT2 0x37
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#define OC_STATUS_WARN(ch) (1 << (ch))
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#define MAX5970_REG_CHXEN 0x3b
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#define CHXEN(ch) (3 << ((ch) * 2))
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#define MAX5970_REG_LED_FLASH 0x43
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#define MAX_REGISTERS 0x49
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#define ADC_MASK 0x3FF
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#endif /* _MFD_MAX597X_H */
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