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

Yuvaraj Cd
2014-08-22T06:01:56Z

On Mon, Aug 18, 2014 at 2:02 PM, Javier Martinez Canillas
<javier.martinez@collabora.co.uk> 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@collabora.co.uk>
> Tested-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
> ---
>
> 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@chromium.org>
> + *
> + * Copyright (C) 2012 Samsung Electronics
> + * Chiwoong Byun <woong.byun@smasung.com>
> + * Jonghwa Lee <jonghwa3.lee@samsung.com>
> + *
> + * 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@chromium.org>");
> +MODULE_LICENSE("GPL");
> --
> 2.0.1
>
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