Re: [PATCH V2 6/6] regulator: max77620: add regulator driver for max77620/max20024

From: Krzysztof Kozlowski
Date: Tue Jan 12 2016 - 20:29:17 EST

On 12.01.2016 18:17, Laxman Dewangan wrote:
> MAXIM Semiconductor's PMIC, MAX77620 and MAX20024 have the
> multiple DCDC and LDOs. This supplies the power to different
> components of the system.
> Also these rails has configuration for ramp time, flexible
> power sequence, slew rate etc.
>
> Add regulator driver to access these rails via regulator APIs.
>
> Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
> Signed-off-by: Mallikarjun Kasoju <mkasoju@xxxxxxxxxx>
> ---
> Changes from V1:
> - Cleanup code based on comment received on mfd/rtc.
> - Avoid duplication on error message.
>
> drivers/regulator/Kconfig | 9 +
> drivers/regulator/Makefile | 1 +
> drivers/regulator/max77620-regulator.c | 991 +++++++++++++++++++++++++++++++++
> 3 files changed, 1001 insertions(+)
> create mode 100644 drivers/regulator/max77620-regulator.c
>
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index 8155e80..b92214b 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -343,6 +343,15 @@ config REGULATOR_MAX1586
> regulator via I2C bus. The provided regulator is suitable
> for PXA27x chips to control VCC_CORE and VCC_USIM voltages.
>
> +config REGULATOR_MAX77620
> + tristate "Maxim 77620/MAX20024 voltage regulator"
> + depends on MFD_MAX77620
> + help
> + This driver controls Maxim MAX77620 voltage output regulator
> + via I2C bus. The provided regulator is suitable for Tegra
> + chip to control Step-Down DC-DC and LDOs. Say Y here to
> + enable the regulator driver.
> +
> config REGULATOR_MAX8649
> tristate "Maxim 8649 voltage regulator"
> depends on I2C
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index 980b194..2564c00 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_REGULATOR_LP8755) += lp8755.o
> obj-$(CONFIG_REGULATOR_LTC3589) += ltc3589.o
> obj-$(CONFIG_REGULATOR_MAX14577) += max14577.o
> obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
> +obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
> obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o
> obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
> obj-$(CONFIG_REGULATOR_MAX8907) += max8907-regulator.o
> diff --git a/drivers/regulator/max77620-regulator.c b/drivers/regulator/max77620-regulator.c
> new file mode 100644
> index 0000000..7c89573
> --- /dev/null
> +++ b/drivers/regulator/max77620-regulator.c
> @@ -0,0 +1,991 @@
> +/*
> + * Maxim MAX77620 Regulator driver
> + *
> + * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
> + *
> + * Author: Mallikarjun Kasoju <mkasoju@xxxxxxxxxx>
> + * Laxman Dewangan <ldewangan@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/core.h>

Do you need kernel.h?
mfd/core.h looks unused.

> +#include <linux/mfd/max77620.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/of.h>
> +#include <linux/regulator/of_regulator.h>
> +
> +#define max77620_rails(_name) "max77620-"#_name
> +
> +/* Power Mode */
> +#define MAX77620_POWER_MODE_NORMAL 3
> +#define MAX77620_POWER_MODE_LPM 2
> +#define MAX77620_POWER_MODE_GLPM 1
> +#define MAX77620_POWER_MODE_DISABLE 0
> +
> +/* SD Slew Rate */
> +#define MAX77620_SD_SR_13_75 0
> +#define MAX77620_SD_SR_27_5 1
> +#define MAX77620_SD_SR_55 2
> +#define MAX77620_SD_SR_100 3
> +
> +#define MAX77620_FPS_SRC_NUM 3
> +
> +struct max77620_regulator_info {
> + u8 type;
> + u32 min_uV;
> + u32 max_uV;
> + u32 step_uV;
> + u8 fps_addr;
> + u8 volt_addr;
> + u8 cfg_addr;
> + u8 volt_mask;
> + u8 power_mode_mask;
> + u8 power_mode_shift;
> + u8 remote_sense_addr;
> + u8 remote_sense_mask;
> + struct regulator_desc desc;
> +};
> +
> +struct max77620_regulator_pdata {
> + bool glpm_enable;
> + bool en2_ctrl_sd0;
> + bool sd_fsrade_disable;
> + bool disable_remote_sense_on_suspend;
> + struct regulator_init_data *reg_idata;
> + int active_fps_src;
> + int active_fps_pd_slot;
> + int active_fps_pu_slot;
> + int suspend_fps_src;
> + int suspend_fps_pd_slot;
> + int suspend_fps_pu_slot;
> + int current_mode;
> +};
> +
> +struct max77620_regulator {
> + struct device *dev;
> + struct max77620_chip *max77620_chip;
> + struct max77620_regulator_info *rinfo[MAX77620_NUM_REGS];
> + struct max77620_regulator_pdata reg_pdata[MAX77620_NUM_REGS];
> + struct regulator_dev *rdev[MAX77620_NUM_REGS];

You don't need the rdev. You are not using it anyway.


> + int enable_power_mode[MAX77620_NUM_REGS];
> + int current_power_mode[MAX77620_NUM_REGS];
> + int active_fps_src[MAX77620_NUM_REGS];
> +};
> +
> +#define fps_src_name(fps_src) \
> + (fps_src == FPS_SRC_0 ? "FPS_SRC_0" : \
> + fps_src == FPS_SRC_1 ? "FPS_SRC_1" : \
> + fps_src == FPS_SRC_2 ? "FPS_SRC_2" : "FPS_SRC_NONE")
> +
> +static int max77620_regulator_get_fps_src(struct max77620_regulator *reg,
> + int id)
> +{
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + u8 val;
> + int ret;
> +
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE,
> + rinfo->fps_addr, &val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x read failed %d\n",
> + rinfo->fps_addr, ret);
> + return ret;
> + }
> +
> + return (val & MAX77620_FPS_SRC_MASK) >> MAX77620_FPS_SRC_SHIFT;
> +}
> +
> +static int max77620_regulator_set_fps_src(struct max77620_regulator *reg,
> + int fps_src, int id)
> +{
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + u8 val;
> + int ret;
> +
> + switch (fps_src) {
> + case FPS_SRC_0:
> + case FPS_SRC_1:
> + case FPS_SRC_2:
> + case FPS_SRC_NONE:
> + break;
> +
> + case FPS_SRC_DEF:
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE,
> + rinfo->fps_addr, &val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x read failed %d\n",
> + rinfo->fps_addr, ret);
> + return ret;
> + }
> + ret = (val & MAX77620_FPS_SRC_MASK) >> MAX77620_FPS_SRC_SHIFT;
> + reg->active_fps_src[id] = ret;
> + return 0;
> +
> + default:
> + dev_err(reg->dev, "Invalid FPS %d for regulator %d\n",
> + fps_src, id);
> + return -EINVAL;
> + }
> +
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->fps_addr, MAX77620_FPS_SRC_MASK,
> + fps_src << MAX77620_FPS_SRC_SHIFT);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x update failed %d\n",
> + rinfo->fps_addr, ret);
> + return ret;
> + }
> + reg->active_fps_src[id] = fps_src;
> +
> + return 0;
> +}
> +
> +static int max77620_regulator_set_fps_slots(struct max77620_regulator *reg,
> + int id, bool is_suspend)
> +{
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + unsigned int val = 0;
> + unsigned int mask = 0;
> + int pu = rpdata->active_fps_pu_slot;
> + int pd = rpdata->active_fps_pd_slot;
> + int ret = 0;
> +
> + if (is_suspend) {
> + pu = rpdata->suspend_fps_pu_slot;
> + pd = rpdata->suspend_fps_pd_slot;
> + }
> +
> + /* FPS power up period setting */
> + if (pu >= 0) {
> + val |= (pu << MAX77620_FPS_PU_PERIOD_SHIFT);
> + mask |= MAX77620_FPS_PU_PERIOD_MASK;
> + }
> +
> + /* FPS power down period setting */
> + if (pd >= 0) {
> + val |= (pd << MAX77620_FPS_PD_PERIOD_SHIFT);
> + mask |= MAX77620_FPS_PD_PERIOD_MASK;
> + }
> +
> + if (mask) {
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->fps_addr, mask, val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->fps_addr, ret);
> + return ret;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static int max77620_regulator_set_power_mode(struct max77620_regulator *reg,
> + int power_mode, int id)
> +{
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + int ret;

Could you put the 'ret' at the end of these variables?

> + struct device *parent = reg->max77620_chip->dev;
> + u8 mask = rinfo->power_mode_mask;
> + u8 shift = rinfo->power_mode_shift;
> + u8 addr;
> +
> + switch (rinfo->type) {
> + case MAX77620_REGULATOR_TYPE_SD:
> + addr = rinfo->cfg_addr;
> + break;
> + default:
> + addr = rinfo->volt_addr;
> + break;
> + }
> +
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + addr, mask, power_mode << shift);
> + if (ret < 0) {
> + dev_err(reg->dev, "Regulator %d mode set failed: %d\n",
> + id, ret);
> + return ret;
> + }
> + reg->current_power_mode[id] = power_mode;
> +
> + return ret;
> +}
> +
> +static int max77620_regulator_get_power_mode(struct max77620_regulator *reg,
> + int id)
> +{
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + u8 val;

Another nit: 'val' after 'u8 addr'.

> + u8 mask = rinfo->power_mode_mask;
> + u8 shift = rinfo->power_mode_shift;
> + u8 addr;
> + int ret;
> +
> + switch (rinfo->type) {
> + case MAX77620_REGULATOR_TYPE_SD:
> + addr = rinfo->cfg_addr;
> + break;
> + default:
> + addr = rinfo->volt_addr;
> + break;
> + }
> +
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE, addr, &val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Regulator %d: Reg 0x%02x read failed: %d\n",
> + id, addr, ret);
> + return ret;
> + }
> +
> + return (val & mask) >> shift;
> +}
> +
> +static int max77620_regulator_enable(struct regulator_dev *rdev)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> +
> + if (reg->active_fps_src[id] != FPS_SRC_NONE)
> + return 0;
> +
> + if ((id == MAX77620_REGULATOR_ID_SD0) && rpdata->en2_ctrl_sd0)
> + return 0;
> +
> + return max77620_regulator_set_power_mode(reg,
> + reg->enable_power_mode[id], id);
> +}
> +
> +static int max77620_regulator_disable(struct regulator_dev *rdev)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> +
> + if (reg->active_fps_src[id] != FPS_SRC_NONE)
> + return 0;
> +
> + if ((id == MAX77620_REGULATOR_ID_SD0) && rpdata->en2_ctrl_sd0)
> + return 0;
> +
> + return max77620_regulator_set_power_mode(reg,
> + MAX77620_POWER_MODE_DISABLE, id);
> +}
> +
> +static int max77620_regulator_is_enabled(struct regulator_dev *rdev)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> + int ret = 1;
> +
> + if (reg->active_fps_src[id] != FPS_SRC_NONE)
> + return 1;
> +
> + if ((id == MAX77620_REGULATOR_ID_SD0) && rpdata->en2_ctrl_sd0)
> + return 1;
> +
> + ret = max77620_regulator_get_power_mode(reg, id);
> + if (ret < 0)
> + return ret;
> +
> + if (ret != MAX77620_POWER_MODE_DISABLE)
> + return 1;
> +
> + return 0;
> +}
> +
> +static int max77620_regulator_set_mode(struct regulator_dev *rdev,
> + unsigned int mode)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> + struct device *parent = reg->max77620_chip->dev;
> + int power_mode;
> + int ret;
> + bool fpwm = false;
> +
> + switch (mode) {
> + case REGULATOR_MODE_FAST:
> + fpwm = true;
> + power_mode = MAX77620_POWER_MODE_NORMAL;
> + break;
> +
> + case REGULATOR_MODE_NORMAL:
> + power_mode = MAX77620_POWER_MODE_NORMAL;
> + break;
> +
> + case REGULATOR_MODE_IDLE:
> + if (rpdata->glpm_enable)
> + power_mode = MAX77620_POWER_MODE_GLPM;
> + else
> + power_mode = MAX77620_POWER_MODE_LPM;
> + break;
> +
> + default:
> + dev_err(reg->dev, "Regulator %d mode %d is invalid\n",
> + id, mode);
> + return -EINVAL;
> + }
> +
> + if (rinfo->type != MAX77620_REGULATOR_TYPE_SD)
> + goto skip_fpwm;
> +
> + if (fpwm)
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, MAX77620_SD_FPWM_MASK,
> + MAX77620_SD_FPWM_MASK);
> + else
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, MAX77620_SD_FPWM_MASK, 0);

Instead something like:

u8 fwpm_val;
if (fpwm)
fwpm_val = MAX77620_SD_FPWM_MASK;
else
fwpm_val = 0;

max77620_reg_update(..., fwpm_val);

You could actually combine it with 'fwpm' variable (replacing it) but I
am not sure if that would make the code more readable. But definitely
one place of calling max77620_reg_update() would be nice.

> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->cfg_addr, ret);
> + return ret;
> + }
> + rpdata->current_mode = mode;
> +
> +skip_fpwm:
> + ret = max77620_regulator_set_power_mode(reg, power_mode, id);
> + if (ret < 0)

You are not reverting the changes made before - setting the fwpm. The
entire operation is not atomic. I am not sure whether that is important
or not... up to you actually.

> + return ret;
> +
> + reg->enable_power_mode[id] = power_mode;
> +
> + return 0;
> +}
> +
> +static unsigned int max77620_regulator_get_mode(struct regulator_dev *rdev)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + struct device *parent = reg->max77620_chip->dev;
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + int fpwm = 0;
> + int ret;
> + int pm_mode, reg_mode;
> + u8 val;
> +
> + ret = max77620_regulator_get_power_mode(reg, id);
> + if (ret < 0)
> + return 0;
> +
> + pm_mode = ret;
> +
> + if (rinfo->type == MAX77620_REGULATOR_TYPE_SD) {
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, &val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x read failed: %d\n",
> + rinfo->cfg_addr, ret);
> + return ret;
> + }
> + fpwm = !!(val & MAX77620_SD_FPWM_MASK);
> + }
> +
> + switch (pm_mode) {
> + case MAX77620_POWER_MODE_NORMAL:
> + case MAX77620_POWER_MODE_DISABLE:
> + if (fpwm)
> + reg_mode = REGULATOR_MODE_FAST;
> + else
> + reg_mode = REGULATOR_MODE_NORMAL;
> + break;
> + case MAX77620_POWER_MODE_LPM:
> + case MAX77620_POWER_MODE_GLPM:
> + reg_mode = REGULATOR_MODE_IDLE;
> + break;
> + default:
> + return 0;
> + }
> +
> + return reg_mode;
> +}
> +
> +static int max77620_regulator_set_ramp_delay(struct regulator_dev *rdev,
> + int ramp_delay)
> +{
> + struct max77620_regulator *reg = rdev_get_drvdata(rdev);
> + int id = rdev_get_id(rdev);
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + int ret, val;
> + u8 mask;
> +
> + if (rinfo->type == MAX77620_REGULATOR_TYPE_SD) {
> + if (ramp_delay <= 13750)
> + val = 0;
> + else if (ramp_delay <= 27500)
> + val = 1;
> + else if (ramp_delay <= 55000)
> + val = 2;
> + else
> + val = 3;
> + val <<= MAX77620_SD_SR_SHIFT;
> + mask = MAX77620_SD_SR_MASK;
> + } else {
> + if (ramp_delay <= 5000)
> + val = 1;
> + else
> + val = 0;
> + mask = MAX77620_LDO_SLEW_RATE_MASK;
> + }
> +
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, mask, val);
> + if (ret < 0)
> + dev_err(reg->dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->cfg_addr, ret);
> +
> + return ret;
> +}
> +
> +static struct regulator_ops max77620_regulator_ops = {
> + .is_enabled = max77620_regulator_is_enabled,
> + .enable = max77620_regulator_enable,
> + .disable = max77620_regulator_disable,
> + .list_voltage = regulator_list_voltage_linear,
> + .map_voltage = regulator_map_voltage_linear,
> + .get_voltage_sel = regulator_get_voltage_sel_regmap,
> + .set_voltage_sel = regulator_set_voltage_sel_regmap,
> + .set_mode = max77620_regulator_set_mode,
> + .get_mode = max77620_regulator_get_mode,
> + .set_ramp_delay = max77620_regulator_set_ramp_delay,
> + .set_voltage_time_sel = regulator_set_voltage_time_sel,
> +};
> +
> +#define MAX77620_SD_CNF2_ROVS_EN_NONE 0
> +#define RAIL_SD(_id, _name, _sname, _volt_mask, _min_uV, _max_uV, \
> + _step_uV, _rs_add, _rs_mask) \
> + [MAX77620_REGULATOR_ID_##_id] = { \
> + .type = MAX77620_REGULATOR_TYPE_SD, \
> + .volt_mask = MAX77620_##_volt_mask##_VOLT_MASK, \
> + .volt_addr = MAX77620_REG_##_id, \
> + .cfg_addr = MAX77620_REG_##_id##_CFG, \
> + .fps_addr = MAX77620_REG_FPS_##_id, \
> + .remote_sense_addr = _rs_add, \
> + .remote_sense_mask = MAX77620_SD_CNF2_ROVS_EN_##_rs_mask, \
> + .min_uV = _min_uV, \
> + .max_uV = _max_uV, \
> + .step_uV = _step_uV, \
> + .power_mode_mask = MAX77620_SD_POWER_MODE_MASK, \
> + .power_mode_shift = MAX77620_SD_POWER_MODE_SHIFT, \
> + .desc = { \
> + .name = max77620_rails(_name), \
> + .supply_name = _sname, \
> + .id = MAX77620_REGULATOR_ID_##_id, \
> + .ops = &max77620_regulator_ops, \
> + .n_voltages = ((_max_uV - _min_uV) / _step_uV) + 1, \
> + .min_uV = _min_uV, \
> + .uV_step = _step_uV, \
> + .enable_time = 500, \
> + .vsel_mask = MAX77620_##_volt_mask##_VOLT_MASK, \
> + .vsel_reg = MAX77620_REG_##_id, \
> + .type = REGULATOR_VOLTAGE, \
> + }, \
> + }
> +
> +#define RAIL_LDO(_id, _name, _sname, _type, _min_uV, _max_uV, _step_uV) \
> + [MAX77620_REGULATOR_ID_##_id] = { \
> + .type = MAX77620_REGULATOR_TYPE_LDO_##_type, \
> + .volt_mask = MAX77620_LDO_VOLT_MASK, \
> + .volt_addr = MAX77620_REG_##_id##_CFG, \
> + .cfg_addr = MAX77620_REG_##_id##_CFG2, \
> + .fps_addr = MAX77620_REG_FPS_##_id, \
> + .remote_sense_addr = 0xFF, \
> + .min_uV = _min_uV, \
> + .max_uV = _max_uV, \
> + .step_uV = _step_uV, \
> + .power_mode_mask = MAX77620_LDO_POWER_MODE_MASK, \
> + .power_mode_shift = MAX77620_LDO_POWER_MODE_SHIFT, \
> + .desc = { \
> + .name = max77620_rails(_name), \
> + .supply_name = _sname, \
> + .id = MAX77620_REGULATOR_ID_##_id, \
> + .ops = &max77620_regulator_ops, \
> + .n_voltages = ((_max_uV - _min_uV) / _step_uV) + 1, \
> + .min_uV = _min_uV, \
> + .uV_step = _step_uV, \
> + .enable_time = 500, \

Here and before please put the line concatenator '\' aligned with
previous, so:
+ .min_uV = _min_uV, \


> + .vsel_mask = MAX77620_LDO_VOLT_MASK, \
> + .vsel_reg = MAX77620_REG_##_id##_CFG, \
> + .type = REGULATOR_VOLTAGE, \
> + }, \
> + }
> +
> +static struct max77620_regulator_info max77620_regs_info[MAX77620_NUM_REGS] = {
> + RAIL_SD(SD0, sd0, "in-sd0", SD0, 600000, 1400000, 12500, 0x22, SD0),
> + RAIL_SD(SD1, sd1, "in-sd1", SD1, 600000, 1550000, 12500, 0x22, SD1),
> + RAIL_SD(SD2, sd2, "in-sd2", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> + RAIL_SD(SD3, sd3, "in-sd3", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> + RAIL_SD(SD4, sd4, "in-sd4", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> +
> + RAIL_LDO(LDO0, ldo0, "in-ldo0-1", N, 800000, 2375000, 25000),
> + RAIL_LDO(LDO1, ldo1, "in-ldo0-1", N, 800000, 2375000, 25000),
> + RAIL_LDO(LDO2, ldo2, "in-ldo2", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO3, ldo3, "in-ldo3-5", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO4, ldo4, "in-ldo4-6", P, 800000, 1587500, 12500),
> + RAIL_LDO(LDO5, ldo5, "in-ldo3-5", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO6, ldo6, "in-ldo4-6", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO7, ldo7, "in-ldo7-8", N, 800000, 3950000, 50000),
> + RAIL_LDO(LDO8, ldo8, "in-ldo7-8", N, 800000, 3950000, 50000),
> +};
> +
> +static struct max77620_regulator_info max20024_regs_info[MAX77620_NUM_REGS] = {
> + RAIL_SD(SD0, sd0, "in-sd0", SD0, 800000, 1587500, 12500, 0x22, SD0),
> + RAIL_SD(SD1, sd1, "in-sd1", SD1, 600000, 3387500, 12500, 0x22, SD1),
> + RAIL_SD(SD2, sd2, "in-sd2", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> + RAIL_SD(SD3, sd3, "in-sd3", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> + RAIL_SD(SD4, sd4, "in-sd4", SDX, 600000, 3787500, 12500, 0xFF, NONE),
> +
> + RAIL_LDO(LDO0, ldo0, "in-ldo0-1", N, 800000, 2375000, 25000),
> + RAIL_LDO(LDO1, ldo1, "in-ldo0-1", N, 800000, 2375000, 25000),
> + RAIL_LDO(LDO2, ldo2, "in-ldo2", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO3, ldo3, "in-ldo3-5", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO4, ldo4, "in-ldo4-6", P, 800000, 1587500, 12500),
> + RAIL_LDO(LDO5, ldo5, "in-ldo3-5", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO6, ldo6, "in-ldo4-6", P, 800000, 3950000, 50000),
> + RAIL_LDO(LDO7, ldo7, "in-ldo7-8", N, 800000, 3950000, 50000),
> + RAIL_LDO(LDO8, ldo8, "in-ldo7-8", N, 800000, 3950000, 50000),
> +};
> +
> +static struct of_regulator_match max77620_regulator_matches[] = {
> + { .name = "sd0", },
> + { .name = "sd1", },
> + { .name = "sd2", },
> + { .name = "sd3", },
> + { .name = "sd4", },
> + { .name = "ldo0", },
> + { .name = "ldo1", },
> + { .name = "ldo2", },
> + { .name = "ldo3", },
> + { .name = "ldo4", },
> + { .name = "ldo5", },
> + { .name = "ldo6", },
> + { .name = "ldo7", },
> + { .name = "ldo8", },
> +};
> +
> +static int max77620_regulator_preinit(struct max77620_regulator *reg, int id)
> +{
> + struct max77620_regulator_pdata *rpdata = &reg->reg_pdata[id];
> + struct max77620_regulator_info *rinfo = reg->rinfo[id];
> + struct device *parent = reg->max77620_chip->dev;
> + struct regulator_init_data *ridata = reg->reg_pdata[id].reg_idata;
> + struct regulator_desc *rdesc = &max77620_regs_info[id].desc;
> + struct device *dev = reg->dev;
> + int init_uv;
> + u8 val, mask, rval;
> + int slew_rate;
> + int ret;
> +
> + if (!ridata)
> + return 0;
> +
> + /* Update power mode */
> + ret = max77620_regulator_get_power_mode(reg, id);
> + if (ret < 0)
> + return ret;
> +
> + reg->current_power_mode[id] = ret;
> + reg->enable_power_mode[id] = MAX77620_POWER_MODE_NORMAL;
> +
> + if (rpdata->active_fps_src == FPS_SRC_DEF) {
> + ret = max77620_regulator_get_fps_src(reg, id);
> + if (ret < 0)
> + return ret;
> + rpdata->active_fps_src = ret;
> + }
> +
> + /*
> + * If rails are externally control of FPS control then enable it
> + * always.
> + */
> + if ((rpdata->active_fps_src != FPS_SRC_NONE) &&
> + (reg->current_power_mode[id] != reg->enable_power_mode[id])) {
> + ret = max77620_regulator_set_power_mode(reg,
> + reg->enable_power_mode[id], id);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Enable rail before changing FPS to NONE to avoid glitch */
> + if (ridata && ridata->constraints.boot_on &&
> + (rpdata->active_fps_src == FPS_SRC_NONE)) {
> + init_uv = ridata->constraints.min_uV;
> + if (init_uv && (init_uv == ridata->constraints.max_uV)) {
> + val = (init_uv - rdesc->min_uV) / rdesc->uV_step;
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rdesc->vsel_reg, rdesc->vsel_mask, val);
> + if (ret < 0) {
> + dev_err(dev, "Reg 0x%02x update failed: %d\n",
> + rdesc->vsel_reg, ret);
> + return ret;
> + }
> + }
> +
> + ret = max77620_regulator_set_power_mode(reg,
> + reg->enable_power_mode[id], id);
> + if (ret < 0)
> + return ret;
> + }
> +
> + ret = max77620_regulator_set_fps_src(reg, rpdata->active_fps_src, id);
> + if (ret < 0)
> + return ret;
> +
> + ret = max77620_regulator_set_fps_slots(reg, id, false);
> + if (ret < 0)
> + return ret;
> +
> + switch (rinfo->type) {
> + case MAX77620_REGULATOR_TYPE_SD:
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, &rval);
> + if (ret < 0) {
> + dev_err(reg->dev, "Register 0x%02x read failed: %d\n",
> + rinfo->cfg_addr, ret);
> + return ret;
> + }
> +
> + slew_rate = (rval >> MAX77620_SD_SR_SHIFT) & 0x3;
> + switch (slew_rate) {
> + case 0:
> + slew_rate = 13750;
> + break;
> + case 1:
> + slew_rate = 27500;
> + break;
> + case 2:
> + slew_rate = 55000;
> + break;
> + case 3:
> + slew_rate = 100000;
> + break;
> + }
> + rinfo->desc.ramp_delay = slew_rate;
> +
> + mask = MAX77620_SD_FSRADE_MASK;
> + val = 0;
> + if (rpdata->sd_fsrade_disable)
> + val |= MAX77620_SD_FSRADE_MASK;
> +
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, mask, val);
> + if (ret < 0) {
> + dev_err(reg->dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->cfg_addr, ret);
> + return ret;
> + }
> + break;
> + default:
> + ret = max77620_reg_read(parent, MAX77620_PWR_SLAVE,
> + rinfo->cfg_addr, &rval);
> + if (ret < 0) {
> + dev_err(reg->dev, "Register 0x%02x read failed: %d\n",
> + rinfo->cfg_addr, ret);
> + return ret;
> + }
> + slew_rate = rval & 0x1;
> + switch (slew_rate) {
> + case 0:
> + slew_rate = 100000;
> + break;
> + case 1:
> + slew_rate = 5000;
> + break;
> + }
> + rinfo->desc.ramp_delay = slew_rate;
> + break;
> + }
> +
> + if ((id == MAX77620_REGULATOR_ID_SD0) && rpdata->en2_ctrl_sd0) {
> + ret = max77620_regulator_set_power_mode(reg,
> + MAX77620_POWER_MODE_NORMAL, id);
> + if (!ret)
> + ret = max77620_regulator_set_fps_src(reg, FPS_SRC_0,
> + id);
> + }
> +
> + return ret;
> +}
> +
> +static int max77620_get_regulator_dt_data(struct platform_device *pdev,
> + struct max77620_regulator *max77620_regs)
> +{
> + struct device_node *np;
> + u32 prop;
> + int id;
> + int ret;
> +
> + np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
> + if (!np) {
> + dev_err(&pdev->dev, "Device is not having regulators node\n");
> + return -ENODEV;
> + }
> +
> + ret = of_regulator_match(&pdev->dev, np, max77620_regulator_matches,
> + ARRAY_SIZE(max77620_regulator_matches));

Why not using 'regulators_node' and getting rid of this and some code
below? If you need to parse custom regulator properties use 'of_parse_cb'.

> + if (ret < 0) {
> + dev_err(&pdev->dev, "regulator node parsing failed: %d\n", ret);
> + return ret;
> + }
> +
> + for (id = 0; id < ARRAY_SIZE(max77620_regulator_matches); ++id) {
> + struct device_node *reg_node;
> + struct max77620_regulator_pdata *reg_pdata =
> + &max77620_regs->reg_pdata[id];
> +
> + reg_node = max77620_regulator_matches[id].of_node;
> + reg_pdata->reg_idata = max77620_regulator_matches[id].init_data;
> +
> + if (!reg_pdata->reg_idata)
> + continue;
> +
> + reg_pdata->glpm_enable = of_property_read_bool(reg_node,
> + "maxim,enable-group-low-power");
> +
> + reg_pdata->en2_ctrl_sd0 = of_property_read_bool(reg_node,
> + "maxim,enable-sd0-en2-control");
> +
> + reg_pdata->sd_fsrade_disable = of_property_read_bool(reg_node,
> + "maxim,disable-active-discharge");
> +
> + reg_pdata->disable_remote_sense_on_suspend =
> + of_property_read_bool(reg_node,
> + "maxim,disable-remote-sense-on-suspend");
> +
> + ret = of_property_read_u32(reg_node,
> + "maxim,active-fps-source", &prop);
> + if (!ret)
> + reg_pdata->active_fps_src = prop;
> + else
> + reg_pdata->active_fps_src = FPS_SRC_DEF;
> +
> + ret = of_property_read_u32(reg_node,
> + "maxim,active-fps-power-up-slot", &prop);
> + if (!ret)
> + reg_pdata->active_fps_pu_slot = prop;
> + else
> + reg_pdata->active_fps_pu_slot = -1;
> +
> + ret = of_property_read_u32(reg_node,
> + "maxim,active-fps-power-down-slot", &prop);
> + if (!ret)
> + reg_pdata->active_fps_pd_slot = prop;
> + else
> + reg_pdata->active_fps_pd_slot = -1;
> +
> + reg_pdata->suspend_fps_src = -1;
> + reg_pdata->suspend_fps_pu_slot = -1;
> + reg_pdata->suspend_fps_pd_slot = -1;
> + ret = of_property_read_u32(reg_node,
> + "maxim,suspend-fps-source", &prop);
> + if (!ret)
> + reg_pdata->suspend_fps_src = prop;
> +
> + ret = of_property_read_u32(reg_node,
> + "maxim,suspend-fps-power-up-slot", &prop);
> + if (!ret)
> + reg_pdata->suspend_fps_pu_slot = prop;
> +
> + ret = of_property_read_u32(reg_node,
> + "maxim,suspend-fps-power-down-slot", &prop);
> + if (!ret)
> + reg_pdata->suspend_fps_pd_slot = prop;
> + }
> +
> + return 0;
> +}
> +
> +static int max77620_regulator_probe(struct platform_device *pdev)
> +{
> + struct max77620_chip *max77620_chip = dev_get_drvdata(pdev->dev.parent);
> + struct regulator_desc *rdesc;

This is should be local to the for-loop,

> + struct max77620_regulator *pmic;
> + struct regulator_config config = { };
> + struct max77620_regulator_info *regulator_info;
> + int ret = 0;
> + int id;
> +
> + pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
> + if (!pmic)
> + return -ENOMEM;
> +
> + max77620_get_regulator_dt_data(pdev, pmic);
> +
> + platform_set_drvdata(pdev, pmic);
> + pmic->max77620_chip = max77620_chip;
> + pmic->dev = &pdev->dev;
> +
> + if (max77620_chip->id == MAX77620)
> + regulator_info = max77620_regs_info;
> + else
> + regulator_info = max20024_regs_info;
> +
> + for (id = 0; id < MAX77620_NUM_REGS; ++id) {
> +
> + if ((max77620_chip->id == MAX77620) &&
> + (id == MAX77620_REGULATOR_ID_SD4))
> + continue;
> +
> + rdesc = &regulator_info[id].desc;
> + pmic->rinfo[id] = &max77620_regs_info[id];
> + pmic->enable_power_mode[id] = MAX77620_POWER_MODE_NORMAL;
> +
> + config.regmap = max77620_chip->rmap[MAX77620_PWR_SLAVE];
> + config.dev = &pdev->dev;
> + config.init_data = pmic->reg_pdata[id].reg_idata;
> + config.driver_data = pmic;

Don't do it for each regulator. Set the config.regmap/dev/driver_data
once before the loop.

Each regulator_register() makes a copy of passed 'config'.

> + config.of_node = max77620_regulator_matches[id].of_node;
> +
> + ret = max77620_regulator_preinit(pmic, id);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Preinit regualtor %s failed: %d\n",
> + rdesc->name, ret);
> + return ret;
> + }
> +
> + pmic->rdev[id] = devm_regulator_register(&pdev->dev,
> + rdesc, &config);
> + if (IS_ERR(pmic->rdev[id])) {
> + ret = PTR_ERR(pmic->rdev[id]);
> + dev_err(&pdev->dev, "Reg registeration %s failed: %d\n",

s/registeration/init/ (or registration?)

> + rdesc->name, ret);
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int max77620_regulator_suspend(struct device *dev)
> +{
> + struct max77620_regulator *pmic = dev_get_drvdata(dev);
> + struct max77620_regulator_pdata *reg_pdata;
> + struct max77620_regulator_info *rinfo;
> + struct device *parent = pmic->dev->parent;
> + int id;
> + int ret;
> +
> + for (id = 0; id < MAX77620_NUM_REGS; ++id) {
> + reg_pdata = &pmic->reg_pdata[id];
> + rinfo = pmic->rinfo[id];
> + if (!reg_pdata || !rinfo)
> + continue;
> +
> + if (reg_pdata->disable_remote_sense_on_suspend &&
> + (rinfo->remote_sense_addr != 0xFF)) {
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->remote_sense_addr,
> + rinfo->remote_sense_mask, 0);
> + if (ret < 0)
> + dev_err(dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->remote_sense_addr, ret);
> + }
> +
> + max77620_regulator_set_fps_slots(pmic, id, true);
> + if (reg_pdata->suspend_fps_src >= 0)
> + max77620_regulator_set_fps_src(pmic,
> + reg_pdata->suspend_fps_src, id);
> + }
> +
> + return 0;
> +}
> +
> +static int max77620_regulator_resume(struct device *dev)
> +{
> + struct max77620_regulator *pmic = dev_get_drvdata(dev);
> + struct max77620_regulator_pdata *reg_pdata;
> + struct max77620_regulator_info *rinfo;
> + struct device *parent = pmic->dev->parent;
> + int id;
> + int ret;
> +
> + for (id = 0; id < MAX77620_NUM_REGS; ++id) {
> + reg_pdata = &pmic->reg_pdata[id];
> + rinfo = pmic->rinfo[id];
> + if (!reg_pdata || !rinfo)
> + continue;
> +
> + if (reg_pdata->disable_remote_sense_on_suspend &&
> + (rinfo->remote_sense_addr != 0xFF)) {
> + ret = max77620_reg_update(parent, MAX77620_PWR_SLAVE,
> + rinfo->remote_sense_addr,
> + rinfo->remote_sense_mask,
> + rinfo->remote_sense_mask);
> + if (ret < 0)
> + dev_err(dev, "Reg 0x%02x update failed: %d\n",
> + rinfo->remote_sense_addr, ret);
> + }
> +
> + max77620_regulator_set_fps_slots(pmic, id, false);
> + if (reg_pdata->active_fps_src >= 0)
> + max77620_regulator_set_fps_src(pmic,
> + reg_pdata->active_fps_src, id);
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops max77620_regulator_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(max77620_regulator_suspend,
> + max77620_regulator_resume)
> +};
> +
> +static const struct platform_device_id max77620_regulator_devtype[] = {
> + {
> + .name = "max77620-pmic",
> + },
> + {
> + .name = "max20024-pmic",
> + },

Sentinel.
MODULE_DEVICE_TABLE

Best regards,
Krzysztof