[PATCH 09/10] regulator: max77693: Add support for MAX77843 device

From: Krzysztof Kozlowski
Date: Wed Apr 29 2015 - 07:00:08 EST

The charger and safeout part of MAX77843 is almost the same as MAX77693.
>From regulator point of view the only differences are the constraints
and register values related to these constraints. Now the max77693
regulator driver can be used for MAX77843.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@xxxxxxxxx>
---
drivers/regulator/Kconfig | 8 +--
drivers/regulator/max77693.c | 125 ++++++++++++++++++++++++++++++++++++++-----
2 files changed, 117 insertions(+), 16 deletions(-)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index a6f116aa5235..7bf6365eb0d3 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -397,13 +397,13 @@ config REGULATOR_MAX77686
Exynos-4 chips to control VARM and VINT voltages.

config REGULATOR_MAX77693
- tristate "Maxim MAX77693 regulator"
- depends on MFD_MAX77693
+ tristate "Maxim 77693/77843 regulator"
+ depends on (MFD_MAX77693 || MFD_MAX77843)
help
- This driver controls a Maxim 77693 regulator via I2C bus.
+ This driver controls a Maxim 77693/77843 regulators via I2C bus.
The regulators include two LDOs, 'SAFEOUT1', 'SAFEOUT2'
and one current regulator 'CHARGER'. This is suitable for
- Exynos-4x12 chips.
+ Exynos-4x12 (MAX77693) or Exynos5433 (MAX77843) SoC chips.

config REGULATOR_MAX77802
tristate "Maxim 77802 regulator"
diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
index 5b30dc42679c..918745d1c5e4 100644
--- a/drivers/regulator/max77693.c
+++ b/drivers/regulator/max77693.c
@@ -1,8 +1,9 @@
/*
- * max77693.c - Regulator driver for the Maxim 77693
+ * max77693.c - Regulator driver for the Maxim 77693 and 77843
*
- * Copyright (C) 2013 Samsung Electronics
+ * Copyright (C) 2013-2015 Samsung Electronics
* Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
+ * Krzysztof Kozlowski <k.kozlowski.k@xxxxxxxxx>
*
* 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
@@ -30,11 +31,24 @@
#include <linux/regulator/machine.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
+#include <linux/mfd/max77843-private.h>
#include <linux/mfd/max77693-common.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>

-/* Charger regulator differences between MAX77693 and MAX77843 */
+/*
+ * ID for MAX77843 regulators.
+ * There is no need for such for MAX77693.
+ */
+enum max77843_regulator_type {
+ MAX77843_SAFEOUT1 = 0,
+ MAX77843_SAFEOUT2,
+ MAX77843_CHARGER,
+
+ MAX77843_NUM,
+};
+
+/* Register differences between chargers: MAX77693 and MAX77843 */
struct chg_reg_data {
unsigned int linear_reg;
unsigned int linear_mask;
@@ -43,9 +57,14 @@ struct chg_reg_data {
};

/*
- * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
+ * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
* 0x00, 0x01, 0x2, 0x03 = 60 mA
* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
+ * Actually for MAX77693 the driver manipulates the maximum input current,
+ * not the fast charge current (output). This should be fixed.
+ *
+ * On MAX77843 the calculation formula is the same (except values).
+ * Fortunately it properly manipulates the fast charge current.
*/
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
@@ -95,6 +114,26 @@ static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
}
/* end of CHARGER regulator ops */

+/* Returns regmap suitable for given regulator on chosen device */
+static struct regmap *max77693_get_regmap(enum max77693_types type,
+ struct max77693_dev *max77693,
+ int reg_id)
+{
+ if (type == TYPE_MAX77693)
+ return max77693->regmap;
+
+ /* Else: TYPE_MAX77843 */
+ switch (reg_id) {
+ case MAX77843_SAFEOUT1:
+ case MAX77843_SAFEOUT2:
+ return max77693->regmap;
+ case MAX77843_CHARGER:
+ return max77693->regmap_chg;
+ default:
+ return max77693->regmap;
+ }
+}
+
static const unsigned int max77693_safeout_table[] = {
4850000,
4900000,
@@ -119,7 +158,7 @@ static struct regulator_ops max77693_charger_ops = {
.set_current_limit = max77693_chg_set_current_limit,
};

-#define regulator_desc_esafeout(_num) { \
+#define max77693_regulator_desc_esafeout(_num) { \
.name = "ESAFEOUT"#_num, \
.id = MAX77693_ESAFEOUT##_num, \
.of_match = of_match_ptr("ESAFEOUT"#_num), \
@@ -135,9 +174,9 @@ static struct regulator_ops max77693_charger_ops = {
.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
}

-static const struct regulator_desc regulators[] = {
- regulator_desc_esafeout(1),
- regulator_desc_esafeout(2),
+static const struct regulator_desc max77693_supported_regulators[] = {
+ max77693_regulator_desc_esafeout(1),
+ max77693_regulator_desc_esafeout(2),
{
.name = "CHARGER",
.id = MAX77693_CHARGER,
@@ -160,19 +199,79 @@ static const struct chg_reg_data max77693_chg_reg_data = {
.min_sel = 3,
};

+#define max77843_regulator_desc_esafeout(num) { \
+ .name = "SAFEOUT" # num, \
+ .id = MAX77843_SAFEOUT ## num, \
+ .ops = &max77693_safeout_ops, \
+ .of_match = of_match_ptr("SAFEOUT" # num), \
+ .regulators_node = of_match_ptr("regulators"), \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ .n_voltages = ARRAY_SIZE(max77693_safeout_table), \
+ .volt_table = max77693_safeout_table, \
+ .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
+ .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \
+ .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \
+ .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
+}
+
+static const struct regulator_desc max77843_supported_regulators[] = {
+ [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
+ [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
+ [MAX77843_CHARGER] = {
+ .name = "CHARGER",
+ .id = MAX77843_CHARGER,
+ .ops = &max77693_charger_ops,
+ .of_match = of_match_ptr("CHARGER"),
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_CURRENT,
+ .owner = THIS_MODULE,
+ .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
+ .enable_mask = MAX77843_CHG_MASK,
+ .enable_val = MAX77843_CHG_MASK,
+ },
+};
+
+static const struct chg_reg_data max77843_chg_reg_data = {
+ .linear_reg = MAX77843_CHG_REG_CHG_CNFG_02,
+ .linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
+ .uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
+ .min_sel = 2,
+};
+
static int max77693_pmic_probe(struct platform_device *pdev)
{
+ enum max77693_types type = platform_get_device_id(pdev)->driver_data;
struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ const struct regulator_desc *regulators;
+ unsigned int regulators_size;
int i;
struct regulator_config config = { };

config.dev = iodev->dev;
- config.regmap = iodev->regmap;
- config.driver_data = (void *)&max77693_chg_reg_data;

- for (i = 0; i < ARRAY_SIZE(regulators); i++) {
+ switch (type) {
+ case TYPE_MAX77693:
+ regulators = max77693_supported_regulators;
+ regulators_size = ARRAY_SIZE(max77693_supported_regulators);
+ config.driver_data = (void *)&max77693_chg_reg_data;
+ break;
+ case TYPE_MAX77843:
+ regulators = max77843_supported_regulators;
+ regulators_size = ARRAY_SIZE(max77843_supported_regulators);
+ config.driver_data = (void *)&max77843_chg_reg_data;
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
+ return -ENODEV;
+ }
+
+ for (i = 0; i < regulators_size; i++) {
struct regulator_dev *rdev;

+ config.regmap = max77693_get_regmap(type, iodev,
+ regulators[i].id);
+
rdev = devm_regulator_register(&pdev->dev,
&regulators[i], &config);
if (IS_ERR(rdev)) {
@@ -187,6 +286,7 @@ static int max77693_pmic_probe(struct platform_device *pdev)

static const struct platform_device_id max77693_pmic_id[] = {
{ "max77693-pmic", TYPE_MAX77693 },
+ { "max77843-regulator", TYPE_MAX77843 },
{},
};

@@ -202,6 +302,7 @@ static struct platform_driver max77693_pmic_driver = {

module_platform_driver(max77693_pmic_driver);

-MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
+MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>");
+MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski.k@xxxxxxxxx>");
MODULE_LICENSE("GPL");
--
2.1.4

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