Message-id: <569DC9AD.7000504@samsung.com>
Date:	Tue, 19 Jan 2016 14:29:17 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Laxman Dewangan <ldewangan@...dia.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linus.walleij@...aro.org, gnurou@...il.com, lee.jones@...aro.org,
	broonie@...nel.org, a.zummo@...ertech.it,
	alexandre.belloni@...e-electrons.com
Cc:	lgirdwood@...il.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	rtc-linux@...glegroups.com, swarren@...dia.com, treding@...dia.com,
	Mallikarjun Kasoju <mkasoju@...dia.com>
Subject: Re: [PATCH V3 5/5] regulator: max77620: add regulator driver for
 max77620/max20024

On 14.01.2016 20:32, 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@...dia.com>
> Signed-off-by: Mallikarjun Kasoju <mkasoju@...dia.com>
> ---
> Changes from V1:
> - Cleanup code based on comment received on mfd/rtc.
> - Avoid duplication on error message.
> 
> Changes form V2:
> - Run coccicheck and checkpatch in strict mode for the alignment.
> - Refactor Regulator driver to use core API for DT parsing.
> - Update based on API changes.
> 
>  drivers/regulator/Kconfig              |   9 +
>  drivers/regulator/Makefile             |   1 +
>  drivers/regulator/max77620-regulator.c | 892 +++++++++++++++++++++++++++++++++
>  3 files changed, 902 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..97e7572
> --- /dev/null
> +++ b/drivers/regulator/max77620-regulator.c
> @@ -0,0 +1,892 @@
> +/*
> + * Maxim MAX77620 Regulator driver
> + *
> + * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
> + *
> + * Author: Mallikarjun Kasoju <mkasoju@...dia.com>
> + *	Laxman Dewangan <ldewangan@...dia.com>
> + *
> + * 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/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/regulator/of_regulator.h>
> +#include <linux/regulator/of_regulator.h>

This duplicated header was not present before... something weird is
happening with your patch. :)

> +#include <linux/mfd/max77620.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 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_desc *rdesc[MAX77620_NUM_REGS];
> +	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 *pmic,
> +					  int id)
> +{
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	u8 val;
> +	int ret;
> +
> +	ret = max77620_reg_read(parent, rinfo->fps_addr, &val);
> +	if (ret < 0) {
> +		dev_err(pmic->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 *pmic,
> +					  int fps_src, int id)
> +{
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->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, rinfo->fps_addr, &val);
> +		if (ret < 0) {
> +			dev_err(pmic->dev, "Reg 0x%02x read failed %d\n",
> +				rinfo->fps_addr, ret);
> +			return ret;
> +		}
> +		ret = (val & MAX77620_FPS_SRC_MASK) >> MAX77620_FPS_SRC_SHIFT;
> +		pmic->active_fps_src[id] = ret;
> +		return 0;
> +
> +	default:
> +		dev_err(pmic->dev, "Invalid FPS %d for regulator %d\n",
> +			fps_src, id);
> +		return -EINVAL;
> +	}
> +
> +	ret = max77620_reg_update(parent, rinfo->fps_addr,
> +				  MAX77620_FPS_SRC_MASK,
> +				  fps_src << MAX77620_FPS_SRC_SHIFT);
> +	if (ret < 0) {
> +		dev_err(pmic->dev, "Reg 0x%02x update failed %d\n",
> +			rinfo->fps_addr, ret);
> +		return ret;
> +	}
> +	pmic->active_fps_src[id] = fps_src;
> +
> +	return 0;
> +}
> +
> +static int max77620_regulator_set_fps_slots(struct max77620_regulator *pmic,
> +					    int id, bool is_suspend)
> +{
> +	struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->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, rinfo->fps_addr, mask, val);
> +		if (ret < 0) {
> +			dev_err(pmic->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 *pmic,
> +					     int power_mode, int id)
> +{
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	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_update(parent, addr, mask, power_mode << shift);
> +	if (ret < 0) {
> +		dev_err(pmic->dev, "Regulator %d mode set failed: %d\n",
> +			id, ret);
> +		return ret;
> +	}
> +	pmic->current_power_mode[id] = power_mode;
> +
> +	return ret;
> +}
> +
> +static int max77620_regulator_get_power_mode(struct max77620_regulator *pmic,
> +					     int id)
> +{
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	u8 mask = rinfo->power_mode_mask;
> +	u8 shift = rinfo->power_mode_shift;
> +	u8 val, 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, addr, &val);
> +	if (ret < 0) {
> +		dev_err(pmic->dev, "Regulator %d: Reg 0x%02x read failed: %d\n",
> +			id, addr, ret);
> +		return ret;
> +	}
> +
> +	return (val & mask) >> shift;
> +}
> +
> +static int max77620_read_slew_rate(struct max77620_regulator *pmic, int id)
> +{
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	u8 rval;
> +	int slew_rate;
> +	int ret;
> +
> +	switch (rinfo->type) {
> +	case MAX77620_REGULATOR_TYPE_SD:
> +		ret = max77620_reg_read(parent, rinfo->cfg_addr, &rval);
> +		if (ret < 0) {
> +			dev_err(pmic->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;
> +		break;
> +	default:
> +		ret = max77620_reg_read(parent, rinfo->cfg_addr, &rval);
> +		if (ret < 0) {
> +			dev_err(pmic->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;
> +	}
> +
> +	return 0;
> +}
> +
> +static int max77620_init_sd_fs_trade(struct max77620_regulator *pmic, int id)
> +{
> +	struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	u8 val;
> +	int ret;
> +
> +	val = (rpdata->sd_fsrade_disable) ? MAX77620_SD_FSRADE_MASK : 0;
> +	ret = max77620_reg_update(parent, rinfo->cfg_addr,
> +				  MAX77620_SD_FSRADE_MASK, val);
> +	if (ret < 0)
> +		dev_err(pmic->dev, "Reg 0x%02x update failed: %d\n",
> +			rinfo->cfg_addr, ret);
> +
> +	return ret;
> +}
> +
> +static int max77620_init_pmic(struct max77620_regulator *pmic, int id)
> +{

This function seems to be used only from max77620_of_parse_cb(). I would
find easier to read if this was located before definition of
max77620_of_parse_cb(). Can you move it (or you had other idea of
placing algorithm)?

> +	struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	int ret;
> +
> +	/* Initialise sd_fstrade */
> +	if (rinfo->type == MAX77620_REGULATOR_TYPE_SD) {
> +		ret = max77620_init_sd_fs_trade(pmic, id);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	/* Update power mode */
> +	ret = max77620_regulator_get_power_mode(pmic, id);
> +	if (ret < 0)
> +		return ret;
> +
> +	pmic->current_power_mode[id] = ret;
> +	pmic->enable_power_mode[id] = MAX77620_POWER_MODE_NORMAL;
> +
> +	if (rpdata->active_fps_src == FPS_SRC_DEF) {
> +		ret = max77620_regulator_get_fps_src(pmic, id);
> +		if (ret < 0)
> +			return ret;
> +		rpdata->active_fps_src = ret;
> +	}
> +
> +	 /* If rails are externally control of FPS then enable it always. */
> +	if (rpdata->active_fps_src == FPS_SRC_NONE) {
> +		ret = max77620_regulator_set_power_mode(
> +				pmic, pmic->enable_power_mode[id], id);
> +		if (ret < 0)
> +			return ret;
> +	} else {
> +		if (pmic->current_power_mode[id] !=
> +		     pmic->enable_power_mode[id]) {
> +			ret = max77620_regulator_set_power_mode(
> +					pmic, pmic->enable_power_mode[id], id);

The 'pmic' argument should be after opening parenthesis, not at new line.

> +			if (ret < 0)
> +				return ret;
> +		}
> +	}
> +
> +	ret = max77620_regulator_set_fps_src(pmic, rpdata->active_fps_src, id);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = max77620_regulator_set_fps_slots(pmic, id, false);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int max77620_regulator_enable(struct regulator_dev *rdev)
> +{
> +	struct max77620_regulator *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +
> +	if (pmic->active_fps_src[id] != FPS_SRC_NONE)
> +		return 0;
> +
> +	return max77620_regulator_set_power_mode(pmic,
> +			pmic->enable_power_mode[id], id);
> +}
> +
> +static int max77620_regulator_disable(struct regulator_dev *rdev)
> +{
> +	struct max77620_regulator *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +
> +	if (pmic->active_fps_src[id] != FPS_SRC_NONE)
> +		return 0;
> +
> +	return max77620_regulator_set_power_mode(pmic,
> +			MAX77620_POWER_MODE_DISABLE, id);
> +}
> +
> +static int max77620_regulator_is_enabled(struct regulator_dev *rdev)
> +{
> +	struct max77620_regulator *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +	int ret = 1;
> +
> +	if (pmic->active_fps_src[id] != FPS_SRC_NONE)
> +		return 1;
> +
> +	ret = max77620_regulator_get_power_mode(pmic, 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 *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[id];
> +	struct device *parent = pmic->max77620_chip->dev;
> +	bool fpwm = false;
> +	int power_mode;
> +	int ret;
> +	u8 val;
> +
> +	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(pmic->dev, "Regulator %d mode %d is invalid\n",
> +			id, mode);
> +		return -EINVAL;
> +	}
> +
> +	if (rinfo->type != MAX77620_REGULATOR_TYPE_SD)
> +		goto skip_fpwm;
> +
> +	val = (fpwm) ? MAX77620_SD_FPWM_MASK : 0;
> +	ret = max77620_reg_update(parent, rinfo->cfg_addr,
> +				  MAX77620_SD_FPWM_MASK, val);
> +	if (ret < 0) {
> +		dev_err(pmic->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(pmic, power_mode, id);
> +	if (ret < 0)
> +		return ret;
> +
> +	pmic->enable_power_mode[id] = power_mode;
> +
> +	return 0;
> +}
> +
> +static unsigned int max77620_regulator_get_mode(struct regulator_dev *rdev)
> +{
> +	struct max77620_regulator *pmic = rdev_get_drvdata(rdev);
> +	struct device *parent = pmic->max77620_chip->dev;
> +	int id = rdev_get_id(rdev);
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	int fpwm = 0;
> +	int ret;
> +	int pm_mode, reg_mode;
> +	u8 val;
> +
> +	ret = max77620_regulator_get_power_mode(pmic, id);
> +	if (ret < 0)
> +		return 0;
> +
> +	pm_mode = ret;
> +
> +	if (rinfo->type == MAX77620_REGULATOR_TYPE_SD) {
> +		ret = max77620_reg_read(parent, rinfo->cfg_addr, &val);
> +		if (ret < 0) {
> +			dev_err(pmic->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 *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
> +	struct max77620_regulator_info *rinfo = pmic->rinfo[id];
> +	struct device *parent = pmic->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, rinfo->cfg_addr, mask, val);
> +	if (ret < 0)
> +		dev_err(pmic->dev, "Reg 0x%02x update failed: %d\n",
> +			rinfo->cfg_addr, ret);
> +
> +	return ret;
> +}
> +
> +static int max77620_of_parse_cb(struct device_node *np,
> +				const struct regulator_desc *desc,
> +				struct regulator_config *config)
> +{
> +	struct max77620_regulator *pmic = config->driver_data;
> +	struct max77620_regulator_pdata *rpdata = &pmic->reg_pdata[desc->id];
> +	u32 pval;
> +	int ret;
> +
> +	rpdata->glpm_enable = of_property_read_bool(np,
> +				"maxim,enable-group-low-power");
> +
> +	rpdata->sd_fsrade_disable = of_property_read_bool(np,
> +				"maxim,disable-active-discharge");
> +
> +	rpdata->disable_remote_sense_on_suspend = of_property_read_bool(
> +				np, "maxim,disable-remote-sense-on-suspend");
> +
> +	ret = of_property_read_u32(np, "maxim,active-fps-source", &pval);
> +	rpdata->active_fps_src = (!ret) ? pval : FPS_SRC_DEF;
> +
> +	ret = of_property_read_u32(np, "maxim,active-fps-power-up-slot", &pval);
> +	rpdata->active_fps_pu_slot = (!ret) ? pval : -1;
> +
> +	ret = of_property_read_u32(
> +			np, "maxim,active-fps-power-down-slot", &pval);
> +	rpdata->active_fps_pd_slot = (!ret) ? pval : -1;
> +
> +	ret = of_property_read_u32(np, "maxim,suspend-fps-source", &pval);
> +	rpdata->suspend_fps_src = (!ret) ? pval : -1;
> +
> +	ret = of_property_read_u32(
> +			np, "maxim,suspend-fps-power-up-slot", &pval);
> +	rpdata->suspend_fps_pu_slot = (!ret) ? pval : -1;
> +
> +	ret = of_property_read_u32(
> +			np, "maxim,suspend-fps-power-down-slot", &pval);
> +	rpdata->suspend_fps_pd_slot = (!ret) ? pval : -1;
> +
> +	return max77620_init_pmic(pmic, desc->id);
> +}
> +
> +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),			\
> +			.of_match = of_match_ptr(#_name),		\
> +			.regulators_node = of_match_ptr("regulators"),	\
> +			.of_parse_cb = max77620_of_parse_cb,		\
> +			.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),			\
> +			.of_match = of_match_ptr(#_name),		\
> +			.regulators_node = of_match_ptr("regulators"),	\
> +			.of_parse_cb = max77620_of_parse_cb,		\
> +			.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_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 int max77620_regulator_probe(struct platform_device *pdev)
> +{
> +	struct max77620_chip *max77620_chip = dev_get_drvdata(pdev->dev.parent);
> +	struct max77620_regulator_info *regulator_info;
> +	struct device *dev = &pdev->dev;
> +	struct regulator_config config = { };
> +	struct max77620_regulator *pmic;
> +	int ret = 0;
> +	int id;
> +
> +	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
> +	if (!pmic)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, pmic);
> +	pmic->max77620_chip = max77620_chip;
> +	pmic->dev = dev;
> +	if (!dev->of_node)
> +		dev->of_node = pdev->dev.parent->of_node;
> +
> +	regulator_info = (max77620_chip->id == MAX77620) ? max77620_regs_info :
> +				max20024_regs_info;
> +
> +	config.regmap = max77620_chip->rmap;
> +	config.dev = dev;
> +	config.driver_data = pmic;
> +
> +	for (id = 0; id < MAX77620_NUM_REGS; ++id) {
> +		struct regulator_dev *rdev;
> +		struct regulator_desc *rdesc;
> +
> +		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;
> +		pmic->rdesc[id] = rdesc;
> +
> +		ret = max77620_read_slew_rate(pmic, id);
> +		if (ret < 0)
> +			return ret;
> +
> +		rdev = devm_regulator_register(dev, rdesc, &config);
> +		if (IS_ERR(rdev)) {
> +			ret = PTR_ERR(rdev);
> +			dev_err(dev, "Regulator registration %s failed: %d\n",
> +				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,
> +						  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)
> +			continue;
> +		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,
> +						  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)
> +			continue;
> +		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", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(platform, max77620_regulator_devtype);
> +
> +static struct platform_driver max77620_regulator_driver = {
> +	.probe = max77620_regulator_probe,
> +	.id_table = max77620_regulator_devtype,
> +	.driver = {
> +		.name = "max77620-pmic",
> +		.pm = &max77620_regulator_pm_ops,
> +	},
> +};
> +
> +static int __init max77620_regulator_init(void)
> +{
> +	return platform_driver_register(&max77620_regulator_driver);
> +}
> +subsys_initcall(max77620_regulator_init);
> +

Does it have to be subsys_initcall? Any special requirements for
ordering the drivers? Probe deferring is encouraged instead.

Best Regards,
Krzysztof

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