Re: [PATCH v9 1/2] regulator: Add driver for max77802 PMIC PMIC regulators

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On Mon, Aug 18, 2014 at 2:02 PM, Javier Martinez Canillas
<javier.martinez@xxxxxxxxxxxxxxx> wrote:
> The MAX77802 PMIC has 10 high-efficiency Buck and 32 Low-dropout
> (LDO) regulators. This patch adds support for all these regulators
> found on the MAX77802 PMIC and is based on a driver added by Simon
> Glass to the Chrome OS kernel 3.8 tree.
>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> Tested-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
> ---
>
> Changes since v7:
>  - Remove DVS support since that can be added as a follow up.
>
> Changes since v6: None
>
> Changes since v5:
>  - Take out the mfd changes from v4 that were squashed by mistake.
>    Suggested by Lee Jones.
>
> Changes since v4: None
>
> Changes since v3:
>  - Set the supply_name for regulators to lookup their parent supply node.
>    Suggested by Mark Brown.
>  - Change Exyno5 for Exynos5420/Exynos5800 in regulator driver Kconfig.
>    Suggested by Doug Anderson.
> ---
>  drivers/regulator/Kconfig    |   9 +
>  drivers/regulator/Makefile   |   1 +
>  drivers/regulator/max77802.c | 578 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 588 insertions(+)
>  create mode 100644 drivers/regulator/max77802.c
>
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index 2dc8289..8134a99 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -387,6 +387,15 @@ config REGULATOR_MAX77693
>           and one current regulator 'CHARGER'. This is suitable for
>           Exynos-4x12 chips.
>
> +config REGULATOR_MAX77802
> +       tristate "Maxim 77802 regulator"
> +       depends on MFD_MAX77686
> +       help
> +         This driver controls a Maxim 77802 regulator
> +         via I2C bus. The provided regulator is suitable for
> +         Exynos5420/Exynos5800 SoCs to control various voltages.
> +         It includes support for control of voltage and ramp speed.
> +
>  config REGULATOR_MC13XXX_CORE
>         tristate
>
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index aa4a6aa..b4ec6c8 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
>  obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
>  obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
>  obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
> +obj-$(CONFIG_REGULATOR_MAX77802) += max77802.o
>  obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
>  obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
>  obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
> diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
> new file mode 100644
> index 0000000..5f022f8
> --- /dev/null
> +++ b/drivers/regulator/max77802.c
> @@ -0,0 +1,578 @@
> +/*
> + * max77802.c - Regulator driver for the Maxim 77802
> + *
> + * Copyright (C) 2013-2014 Google, Inc
> + * Simon Glass <sjg@xxxxxxxxxxxx>
> + *
> + * Copyright (C) 2012 Samsung Electronics
> + * Chiwoong Byun <woong.byun@xxxxxxxxxxx>
> + * Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that 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.
> + *
> + * This driver is based on max8997.c
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/bug.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/slab.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/machine.h>
> +#include <linux/regulator/of_regulator.h>
> +#include <linux/mfd/max77686.h>
> +#include <linux/mfd/max77686-private.h>
> +
> +/* Default ramp delay in case it is not manually set */
> +#define MAX77802_RAMP_DELAY            100000          /* uV/us */
> +
> +#define MAX77802_OPMODE_SHIFT_LDO      6
> +#define MAX77802_OPMODE_BUCK234_SHIFT  4
> +#define MAX77802_OPMODE_MASK           0x3
> +
> +#define MAX77802_VSEL_MASK             0x3F
> +#define MAX77802_DVS_VSEL_MASK         0xFF
> +
> +#define MAX77802_RAMP_RATE_MASK_2BIT   0xC0
> +#define MAX77802_RAMP_RATE_SHIFT_2BIT  6
> +#define MAX77802_RAMP_RATE_MASK_4BIT   0xF0
> +#define MAX77802_RAMP_RATE_SHIFT_4BIT  4
> +
> +/* MAX77802 has two register formats: 2-bit and 4-bit */
> +static const unsigned int ramp_table_77802_2bit[] = {
> +       12500,
> +       25000,
> +       50000,
> +       100000,
> +};
> +
> +static unsigned int ramp_table_77802_4bit[] = {
> +       1000,   2000,   3030,   4000,
> +       5000,   5880,   7140,   8330,
> +       9090,   10000,  11110,  12500,
> +       16670,  25000,  50000,  100000,
> +};
> +
> +struct max77802_regulator_prv {
> +       int num_regulators;
> +       struct regulator_dev *rdev[MAX77802_REG_MAX];
> +       unsigned int opmode[MAX77802_REG_MAX];
> +};
> +
> +static int max77802_get_opmode_shift(int id)
> +{
> +       if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
> +                                    id <= MAX77802_BUCK10))
> +               return 0;
> +
> +       if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
> +               return MAX77802_OPMODE_BUCK234_SHIFT;
> +
> +       if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
> +               return MAX77802_OPMODE_SHIFT_LDO;
> +
> +       return -EINVAL;
> +}
> +
> +/*
> + * Some BUCKS supports Normal[ON/OFF] mode during suspend
> + *
> + * BUCK 1, 6, 2-4, 5, 7-10 (all)
> + *
> + * The other mode (0x02) will make PWRREQ switch between normal
> + * and low power.
> + */
> +static int max77802_buck_set_suspend_disable(struct regulator_dev *rdev)
> +{
> +       unsigned int val = MAX77802_OPMODE_STANDBY;
> +       struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
> +       int id = rdev_get_id(rdev);
> +       int shift = max77802_get_opmode_shift(id);
> +
> +       max77802->opmode[id] = val;
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 rdev->desc->enable_mask, val << shift);
> +}
> +
> +/*
> + * Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state
> + * (Enable Control Logic1 by PWRREQ)
> + *
> + * LDOs 2, 4-19, 22-35.
> + *
> + */
> +static int max77802_ldo_set_suspend_mode_logic1(struct regulator_dev *rdev,
> +                                               unsigned int mode)
> +{
> +       struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
> +       int id = rdev_get_id(rdev);
> +       unsigned int val;
> +       int shift = max77802_get_opmode_shift(id);
> +
> +       switch (mode) {
> +       case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
> +               val = MAX77802_OPMODE_LP;
> +               break;
> +       case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
> +               val = MAX77802_OPMODE_NORMAL;
> +               break;
> +       case REGULATOR_MODE_STANDBY:                    /* ON/OFF by PWRREQ */
> +               val = MAX77802_OPMODE_STANDBY;
> +               break;
> +       default:
> +               dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
> +                        rdev->desc->name, mode);
> +               return -EINVAL;
> +       }
> +
> +       max77802->opmode[rdev_get_id(rdev)] = val;
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 rdev->desc->enable_mask, val << shift);
> +}
> +
> +/*
> + * Mode 1 (Output[ON/OFF] by PWRREQ) is not supported on some LDOs
> + * (Enable Control Logic2 by PWRREQ)
> + *
> + * LDOs 1, 20, 21, and 3,
> + *
> + */
> +static int max77802_ldo_set_suspend_mode_logic2(struct regulator_dev *rdev,
> +                                               unsigned int mode)
> +{
> +       struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
> +       int id = rdev_get_id(rdev);
> +       unsigned int val;
> +       int shift = max77802_get_opmode_shift(id);
> +
> +       switch (mode) {
> +       case REGULATOR_MODE_IDLE:                       /* ON in LP Mode */
> +               val = MAX77802_OPMODE_LP;
> +               break;
> +       case REGULATOR_MODE_NORMAL:                     /* ON in Normal Mode */
> +               val = MAX77802_OPMODE_NORMAL;
> +               break;
> +       default:
> +               dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
> +                        rdev->desc->name, mode);
> +               return -EINVAL;
> +       }
> +
> +       max77802->opmode[rdev_get_id(rdev)] = val;
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 rdev->desc->enable_mask, val << shift);
> +}
> +
> +static int max77802_enable(struct regulator_dev *rdev)
> +{
> +       struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
> +       int id = rdev_get_id(rdev);
> +       int shift = max77802_get_opmode_shift(id);
> +
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 rdev->desc->enable_mask,
> +                                 max77802->opmode[id] << shift);
> +}
> +
> +static int max77802_find_ramp_value(struct regulator_dev *rdev,
> +                                   const unsigned int limits[], int size,
> +                                   unsigned int ramp_delay)
> +{
> +       int i;
> +
> +       for (i = 0; i < size; i++) {
> +               if (ramp_delay <= limits[i])
> +                       return i;
> +       }
> +
> +       /* Use maximum value for no ramp control */
> +       dev_warn(&rdev->dev, "%s: ramp_delay: %d not supported, setting 100000\n",
> +                rdev->desc->name, ramp_delay);
> +       return size - 1;
> +}
> +
> +/* Used for BUCKs 2-4 */
> +static int max77802_set_ramp_delay_2bit(struct regulator_dev *rdev,
> +                                       int ramp_delay)
> +{
> +       int id = rdev_get_id(rdev);
> +       unsigned int ramp_value;
> +
> +       if (id > MAX77802_BUCK4) {
> +                       dev_warn(&rdev->dev,
> +                                "%s: regulator: ramp delay not supported\n",
> +                                rdev->desc->name);
> +               return -EINVAL;
> +       }
> +       ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_2bit,
> +                               ARRAY_SIZE(ramp_table_77802_2bit), ramp_delay);
> +
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 MAX77802_RAMP_RATE_MASK_2BIT,
> +                                 ramp_value << MAX77802_RAMP_RATE_SHIFT_2BIT);
> +}
> +
> +/* For BUCK1, 6 */
> +static int max77802_set_ramp_delay_4bit(struct regulator_dev *rdev,
> +                                           int ramp_delay)
> +{
> +       unsigned int ramp_value;
> +
> +       ramp_value = max77802_find_ramp_value(rdev, ramp_table_77802_4bit,
> +                               ARRAY_SIZE(ramp_table_77802_4bit), ramp_delay);
> +
> +       return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
> +                                 MAX77802_RAMP_RATE_MASK_4BIT,
> +                                 ramp_value << MAX77802_RAMP_RATE_SHIFT_4BIT);
> +}
> +
> +/*
> + * LDOs 2, 4-19, 22-35
> + */
> +static struct regulator_ops max77802_ldo_ops_logic1 = {
> +       .list_voltage           = regulator_list_voltage_linear,
> +       .map_voltage            = regulator_map_voltage_linear,
> +       .is_enabled             = regulator_is_enabled_regmap,
> +       .enable                 = max77802_enable,
> +       .disable                = regulator_disable_regmap,
> +       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
> +       .set_voltage_sel        = regulator_set_voltage_sel_regmap,
> +       .set_voltage_time_sel   = regulator_set_voltage_time_sel,
> +       .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic1,
> +};
> +
> +/*
> + * LDOs 1, 20, 21, 3
> + */
> +static struct regulator_ops max77802_ldo_ops_logic2 = {
> +       .list_voltage           = regulator_list_voltage_linear,
> +       .map_voltage            = regulator_map_voltage_linear,
> +       .is_enabled             = regulator_is_enabled_regmap,
> +       .enable                 = max77802_enable,
> +       .disable                = regulator_disable_regmap,
> +       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
> +       .set_voltage_sel        = regulator_set_voltage_sel_regmap,
> +       .set_voltage_time_sel   = regulator_set_voltage_time_sel,
> +       .set_suspend_mode       = max77802_ldo_set_suspend_mode_logic2,
> +};
> +
> +/* BUCKS 1, 6 */
> +static struct regulator_ops max77802_buck_16_dvs_ops = {
> +       .list_voltage           = regulator_list_voltage_linear,
> +       .map_voltage            = regulator_map_voltage_linear,
> +       .is_enabled             = regulator_is_enabled_regmap,
> +       .enable                 = max77802_enable,
> +       .disable                = regulator_disable_regmap,
> +       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
> +       .set_voltage_sel        = regulator_set_voltage_sel_regmap,
> +       .set_voltage_time_sel   = regulator_set_voltage_time_sel,
> +       .set_ramp_delay         = max77802_set_ramp_delay_4bit,
> +       .set_suspend_disable    = max77802_buck_set_suspend_disable,
> +};
> +
> +/* BUCKs 2-4, 5, 7-10 */
> +static struct regulator_ops max77802_buck_dvs_ops = {
> +       .list_voltage           = regulator_list_voltage_linear,
> +       .map_voltage            = regulator_map_voltage_linear,
> +       .is_enabled             = regulator_is_enabled_regmap,
> +       .enable                 = max77802_enable,
> +       .disable                = regulator_disable_regmap,
> +       .get_voltage_sel        = regulator_get_voltage_sel_regmap,
> +       .set_voltage_sel        = regulator_set_voltage_sel_regmap,
> +       .set_voltage_time_sel   = regulator_set_voltage_time_sel,
> +       .set_ramp_delay         = max77802_set_ramp_delay_2bit,
> +       .set_suspend_disable    = max77802_buck_set_suspend_disable,
> +};
> +
> +/* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
> +#define regulator_77802_desc_p_ldo(num, supply, log)   {               \
> +       .name           = "LDO"#num,                                    \
> +       .id             = MAX77802_LDO##num,                            \
> +       .supply_name    = "inl"#supply,                                 \
> +       .ops            = &max77802_ldo_ops_logic##log,                 \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 800000,                                       \
> +       .uV_step        = 50000,                                        \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 1 << 6,                                       \
> +       .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
> +       .vsel_mask      = MAX77802_VSEL_MASK,                           \
> +       .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
> +       .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
> +}
> +
> +/* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
> +#define regulator_77802_desc_n_ldo(num, supply, log)   {               \
> +       .name           = "LDO"#num,                                    \
> +       .id             = MAX77802_LDO##num,                            \
> +       .supply_name    = "inl"#supply,                                 \
> +       .ops            = &max77802_ldo_ops_logic##log,                 \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 800000,                                       \
> +       .uV_step        = 25000,                                        \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 1 << 6,                                       \
> +       .vsel_reg       = MAX77802_REG_LDO1CTRL1 + num - 1,             \
> +       .vsel_mask      = MAX77802_VSEL_MASK,                           \
> +       .enable_reg     = MAX77802_REG_LDO1CTRL1 + num - 1,             \
> +       .enable_mask    = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
> +}
> +
> +/* BUCKs 1, 6 */
> +#define regulator_77802_desc_16_buck(num)      {               \
> +       .name           = "BUCK"#num,                                   \
> +       .id             = MAX77802_BUCK##num,                           \
> +       .supply_name    = "inb"#num,                                    \
> +       .ops            = &max77802_buck_16_dvs_ops,                    \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 612500,                                       \
> +       .uV_step        = 6250,                                         \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 1 << 8,                                       \
> +       .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
> +       .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
> +       .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL,             \
> +       .enable_mask    = MAX77802_OPMODE_MASK,                         \
> +}
> +
> +/* BUCKS 2-4 */
> +#define regulator_77802_desc_234_buck(num)     {               \
> +       .name           = "BUCK"#num,                                   \
> +       .id             = MAX77802_BUCK##num,                           \
> +       .supply_name    = "inb"#num,                                    \
> +       .ops            = &max77802_buck_dvs_ops,                       \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 600000,                                       \
> +       .uV_step        = 6250,                                         \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 0x91,                                         \
> +       .vsel_reg       = MAX77802_REG_BUCK ## num ## DVS1,             \
> +       .vsel_mask      = MAX77802_DVS_VSEL_MASK,                       \
> +       .enable_reg     = MAX77802_REG_BUCK ## num ## CTRL1,            \
> +       .enable_mask    = MAX77802_OPMODE_MASK <<                       \
> +                               MAX77802_OPMODE_BUCK234_SHIFT,          \
> +}
> +
> +/* BUCK 5 */
> +#define regulator_77802_desc_buck5(num)                {               \
> +       .name           = "BUCK"#num,                                   \
> +       .id             = MAX77802_BUCK##num,                           \
> +       .supply_name    = "inb"#num,                                    \
> +       .ops            = &max77802_buck_dvs_ops,                       \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 750000,                                       \
> +       .uV_step        = 50000,                                        \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 1 << 6,                                       \
> +       .vsel_reg       = MAX77802_REG_BUCK5OUT,                        \
> +       .vsel_mask      = MAX77802_VSEL_MASK,                           \
> +       .enable_reg     = MAX77802_REG_BUCK5CTRL,                       \
> +       .enable_mask    = MAX77802_OPMODE_MASK,                         \
> +}
> +
> +/* BUCKs 7-10 */
> +#define regulator_77802_desc_buck7_10(num)     {               \
> +       .name           = "BUCK"#num,                                   \
> +       .id             = MAX77802_BUCK##num,                           \
> +       .supply_name    = "inb"#num,                                    \
> +       .ops            = &max77802_buck_dvs_ops,                       \
> +       .type           = REGULATOR_VOLTAGE,                            \
> +       .owner          = THIS_MODULE,                                  \
> +       .min_uV         = 750000,                                       \
> +       .uV_step        = 50000,                                        \
> +       .ramp_delay     = MAX77802_RAMP_DELAY,                          \
> +       .n_voltages     = 1 << 6,                                       \
> +       .vsel_reg       = MAX77802_REG_BUCK7OUT + (num - 7) * 3,        \
> +       .vsel_mask      = MAX77802_VSEL_MASK,                           \
> +       .enable_reg     = MAX77802_REG_BUCK7CTRL + (num - 7) * 3,       \
> +       .enable_mask    = MAX77802_OPMODE_MASK,                         \
> +}
> +
> +static struct regulator_desc regulators[] = {
> +       regulator_77802_desc_16_buck(1),
> +       regulator_77802_desc_234_buck(2),
> +       regulator_77802_desc_234_buck(3),
> +       regulator_77802_desc_234_buck(4),
> +       regulator_77802_desc_buck5(5),
> +       regulator_77802_desc_16_buck(6),
> +       regulator_77802_desc_buck7_10(7),
> +       regulator_77802_desc_buck7_10(8),
> +       regulator_77802_desc_buck7_10(9),
> +       regulator_77802_desc_buck7_10(10),
> +       regulator_77802_desc_n_ldo(1, 10, 2),
> +       regulator_77802_desc_n_ldo(2, 10, 1),
> +       regulator_77802_desc_p_ldo(3, 3, 2),
> +       regulator_77802_desc_p_ldo(4, 6, 1),
> +       regulator_77802_desc_p_ldo(5, 3, 1),
> +       regulator_77802_desc_p_ldo(6, 3, 1),
> +       regulator_77802_desc_p_ldo(7, 3, 1),
> +       regulator_77802_desc_n_ldo(8, 1, 1),
> +       regulator_77802_desc_p_ldo(9, 5, 1),
> +       regulator_77802_desc_p_ldo(10, 4, 1),
> +       regulator_77802_desc_p_ldo(11, 4, 1),
> +       regulator_77802_desc_p_ldo(12, 9, 1),
> +       regulator_77802_desc_p_ldo(13, 4, 1),
> +       regulator_77802_desc_p_ldo(14, 4, 1),
> +       regulator_77802_desc_n_ldo(15, 1, 1),
> +       regulator_77802_desc_n_ldo(17, 2, 1),
> +       regulator_77802_desc_p_ldo(18, 7, 1),
> +       regulator_77802_desc_p_ldo(19, 5, 1),
> +       regulator_77802_desc_p_ldo(20, 7, 2),
> +       regulator_77802_desc_p_ldo(21, 6, 2),
> +       regulator_77802_desc_p_ldo(23, 9, 1),
> +       regulator_77802_desc_p_ldo(24, 6, 1),
> +       regulator_77802_desc_p_ldo(25, 9, 1),
> +       regulator_77802_desc_p_ldo(26, 9, 1),
> +       regulator_77802_desc_n_ldo(27, 2, 1),
> +       regulator_77802_desc_p_ldo(28, 7, 1),
> +       regulator_77802_desc_p_ldo(29, 7, 1),
> +       regulator_77802_desc_n_ldo(30, 2, 1),
> +       regulator_77802_desc_p_ldo(32, 9, 1),
> +       regulator_77802_desc_p_ldo(33, 6, 1),
> +       regulator_77802_desc_p_ldo(34, 9, 1),
> +       regulator_77802_desc_n_ldo(35, 2, 1),
> +};
> +
> +#ifdef CONFIG_OF
> +static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
> +                                       struct max77686_platform_data *pdata)
> +{
> +       struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> +       struct device_node *pmic_np, *regulators_np;
> +       struct max77686_regulator_data *rdata;
> +       struct of_regulator_match rmatch;
> +       unsigned int i;
> +
> +       pmic_np = iodev->dev->of_node;
> +       regulators_np = of_get_child_by_name(pmic_np, "regulators");
> +       if (!regulators_np) {
> +               dev_err(&pdev->dev, "could not find regulators sub-node\n");
> +               return -EINVAL;
> +       }
> +
> +       pdata->num_regulators = ARRAY_SIZE(regulators);
> +       rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
> +                            pdata->num_regulators, GFP_KERNEL);
> +       if (!rdata) {
> +               of_node_put(regulators_np);
> +               return -ENOMEM;
> +       }
> +
> +       for (i = 0; i < pdata->num_regulators; i++) {
> +               rmatch.name = regulators[i].name;
> +               rmatch.init_data = NULL;
> +               rmatch.of_node = NULL;
> +               if (of_regulator_match(&pdev->dev, regulators_np, &rmatch,
> +                                      1) != 1) {
> +                       dev_warn(&pdev->dev, "No matching regulator for '%s'\n",
> +                                rmatch.name);
> +                       continue;
> +               }
> +               rdata[i].initdata = rmatch.init_data;
> +               rdata[i].of_node = rmatch.of_node;
> +               rdata[i].id = regulators[i].id;
> +       }
> +
> +       pdata->regulators = rdata;
> +       of_node_put(regulators_np);
> +
> +       return 0;
> +}
> +#else
> +static int max77802_pmic_dt_parse_pdata(struct platform_device *pdev,
> +                                       struct max77686_platform_data *pdata)
> +{
> +       return 0;
> +}
> +#endif /* CONFIG_OF */
> +
> +static int max77802_pmic_probe(struct platform_device *pdev)
> +{
> +       struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> +       struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
> +       struct max77802_regulator_prv *max77802;
> +       int i, ret = 0, val;
> +       struct regulator_config config = { };
> +
> +       /* This is allocated by the MFD driver */
> +       if (!pdata) {
> +               dev_err(&pdev->dev, "no platform data found for regulator\n");
> +               return -ENODEV;
> +       }
> +
> +       max77802 = devm_kzalloc(&pdev->dev,
> +                               sizeof(struct max77802_regulator_prv),
> +                               GFP_KERNEL);
> +       if (!max77802)
> +               return -ENOMEM;
> +
> +       if (iodev->dev->of_node) {
> +               ret = max77802_pmic_dt_parse_pdata(pdev, pdata);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       config.dev = iodev->dev;
> +       config.regmap = iodev->regmap;
> +       config.driver_data = max77802;
> +       platform_set_drvdata(pdev, max77802);
> +
> +       for (i = 0; i < MAX77802_REG_MAX; i++) {
> +               struct regulator_dev *rdev;
> +               int id = pdata->regulators[i].id;
> +               int shift = max77802_get_opmode_shift(id);
> +
> +               config.init_data = pdata->regulators[i].initdata;
> +               config.of_node = pdata->regulators[i].of_node;
> +
> +               ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
> +               max77802->opmode[id] = val >> shift & MAX77802_OPMODE_MASK;

I have been using this patch series for adding UHS support for dw_mmc
driver. During reboot testing I came across an issue where card
detection fails due to vqmmc regulator not getting enabled. On
debugging further, I found that PMIC driver is reading the operating
mode during probe and reusing it in the enable function. With the UHS
patches vqmmc regulator gets disabled during POWER_OFF and if we do
warm reboot, an incorrect operating mode(OFF) is read. This leads to
the vqmmc regulator staying disabled. I have referred to 77686 driver
and observed that they are handling this a little differently. With
the following change in the driver above issue is resolved:

-               ret = regmap_read(iodev->regmap,
regulators[i].enable_reg, &val);
-               max77802->opmode[id] = val >> shift & MAX77802_OPMODE_MASK;
+               max77802->opmode[i] = regulators[i].enable_mask >> shift;

Please have a look and let me know, if there is any better way of handling this.

> +
> +               rdev = devm_regulator_register(&pdev->dev,
> +                                              &regulators[i], &config);
> +               if (IS_ERR(rdev)) {
> +                       dev_err(&pdev->dev,
> +                               "regulator init failed for %d\n", i);
> +                       return PTR_ERR(rdev);
> +               }
> +       }
> +
> +       return 0;
> +}
> +
> +static const struct platform_device_id max77802_pmic_id[] = {
> +       {"max77802-pmic", 0},
> +       { },
> +};
> +MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
> +
> +static struct platform_driver max77802_pmic_driver = {
> +       .driver = {
> +               .name = "max77802-pmic",
> +               .owner = THIS_MODULE,
> +       },
> +       .probe = max77802_pmic_probe,
> +       .id_table = max77802_pmic_id,
> +};
> +
> +module_platform_driver(max77802_pmic_driver);
> +
> +MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
> +MODULE_AUTHOR("Simon Glass <sjg@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> --
> 2.0.1
>
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