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Subject[PATCH V4 04/10] regulator: da9121: Add device variant regmaps
Add ability to probe device and validate configuration, then apply a regmap
configuration for a single or dual buck device accordingly.

Signed-off-by: Adam Ward <Adam.Ward.opensource@diasemi.com>
---
drivers/regulator/Kconfig | 14 +-
drivers/regulator/da9121-regulator.c | 244 ++++++++++++++++++++++++++++++++---
include/linux/regulator/da9121.h | 25 ++++
3 files changed, 262 insertions(+), 21 deletions(-)
create mode 100644 include/linux/regulator/da9121.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index ca908bd..5371709 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -313,13 +313,21 @@ config REGULATOR_DA9063
will be called da9063-regulator.

config REGULATOR_DA9121
- tristate "Dialog Semiconductor DA9121 regulator"
+ tristate "Dialog Semiconductor DA9121/DA9122/DA9220/DA9217/DA9130/DA9131/DA9132 regulator"
depends on I2C && OF
select REGMAP_I2C
help
Say y here to support for the Dialog Semiconductor DA9121. The
- DA9210 is a dual-phase buck converter controlled through an I2C
- interface.
+ DA9121 is a single channel dual-phase buck converter controlled
+ through an I2C interface.
+
+ DA9121 Single-channel dual-phase 10A buck converter
+ DA9130 Single-channel dual-phase 10A buck converter (Automotive)
+ DA9217 Single-channel dual-phase 6A buck converter
+ DA9122 Dual-channel single-phase 5A buck converter
+ DA9131 Dual-channel single-phase 5A buck converter (Automotive)
+ DA9220 Dual-channel single-phase 3A buck converter
+ DA9132 Dual-channel single-phase 3A buck converter (Automotive)

This driver can also be built as a module. If so, the module
will be called da9121-regulator.
diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index 5bebdb2..137b1df 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -1,5 +1,17 @@
// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (C) 2020 Axis Communications AB */
+//
+// DA9121 Single-channel dual-phase 10A buck converter
+//
+// Copyright (C) 2020 Axis Communications AB
+//
+// DA9130 Single-channel dual-phase 10A buck converter (Automotive)
+// DA9217 Single-channel dual-phase 6A buck converter
+// DA9122 Dual-channel single-phase 5A buck converter
+// DA9131 Dual-channel single-phase 5A buck converter (Automotive)
+// DA9220 Dual-channel single-phase 3A buck converter
+// DA9132 Dual-channel single-phase 3A buck converter (Automotive)
+//
+// Copyright (C) 2020 Dialog Semiconductor

#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
@@ -9,26 +21,17 @@
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/i2c.h>
+#include <linux/regulator/da9121.h>
+
#include "da9121-regulator.h"

/* Chip data */
struct da9121 {
struct device *dev;
+ struct regmap *regmap;
int variant_id;
};

-#define DA9121_MIN_MV 300
-#define DA9121_MAX_MV 1900
-#define DA9121_STEP_MV 10
-#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
-#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
- + 1 + DA9121_MIN_SEL)
-
-static const struct regmap_config da9121_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
-};
-
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
@@ -38,6 +41,13 @@ struct da9121 {
.list_voltage = regulator_list_voltage_linear,
};

+#define DA9121_MIN_MV 300
+#define DA9121_MAX_MV 1900
+#define DA9121_STEP_MV 10
+#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
+#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
+ + 1 + DA9121_MIN_SEL)
+
static const struct regulator_desc da9121_reg = {
.name = "da9121",
.of_match = "buck1",
@@ -58,6 +68,205 @@ struct da9121 {
.enable_time = 20,
};

+/* DA9121 chip register model */
+static const struct regmap_range da9121_1ch_readable_ranges[] = {
+ regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
+ regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
+ regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
+ regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
+};
+
+static const struct regmap_access_table da9121_1ch_readable_table = {
+ .yes_ranges = da9121_1ch_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
+};
+
+static const struct regmap_range da9121_2ch_readable_ranges[] = {
+ regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
+ regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
+ regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
+ regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
+ regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
+};
+
+static const struct regmap_access_table da9121_2ch_readable_table = {
+ .yes_ranges = da9121_2ch_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
+};
+
+static const struct regmap_range da9121_1ch_writeable_ranges[] = {
+ regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
+ regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
+ regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
+};
+
+static const struct regmap_access_table da9121_1ch_writeable_table = {
+ .yes_ranges = da9121_1ch_writeable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
+};
+
+static const struct regmap_range da9121_2ch_writeable_ranges[] = {
+ regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
+ regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
+ regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
+ regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
+ regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
+};
+
+static const struct regmap_access_table da9121_2ch_writeable_table = {
+ .yes_ranges = da9121_2ch_writeable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
+};
+
+
+static const struct regmap_range da9121_volatile_ranges[] = {
+ regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
+ regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
+ regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
+};
+
+static const struct regmap_access_table da9121_volatile_table = {
+ .yes_ranges = da9121_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
+};
+
+/* DA9121 regmap config for 1 channel variants */
+static struct regmap_config da9121_1ch_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = DA9121_REG_OTP_CONFIG_ID,
+ .rd_table = &da9121_1ch_readable_table,
+ .wr_table = &da9121_1ch_writeable_table,
+ .volatile_table = &da9121_volatile_table,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+/* DA9121 regmap config for 2 channel variants */
+static struct regmap_config da9121_2ch_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = DA9121_REG_OTP_CONFIG_ID,
+ .rd_table = &da9121_2ch_readable_table,
+ .wr_table = &da9121_2ch_writeable_table,
+ .volatile_table = &da9121_volatile_table,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
+{
+ u32 device_id;
+ u8 chip_id = chip->variant_id;
+ u32 variant_id;
+ u8 variant_mrc, variant_vrc;
+ char *type;
+ const char *name;
+ bool config_match = false;
+ int ret = 0;
+
+ ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
+ if (ret < 0) {
+ dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
+ goto error;
+ }
+
+ ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
+ if (ret < 0) {
+ dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
+ goto error;
+ }
+
+ if (device_id != DA9121_DEVICE_ID) {
+ dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
+ ret = -ENODEV;
+ goto error;
+ }
+
+ variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
+
+ switch (variant_vrc) {
+ case DA9121_VARIANT_VRC:
+ type = "DA9121/DA9130";
+ config_match = (chip_id == DA9121_TYPE_DA9121_DA9130);
+ break;
+ case DA9220_VARIANT_VRC:
+ type = "DA9220/DA9132";
+ config_match = (chip_id == DA9121_TYPE_DA9220_DA9132);
+ break;
+ case DA9122_VARIANT_VRC:
+ type = "DA9122/DA9131";
+ config_match = (chip_id == DA9121_TYPE_DA9122_DA9131);
+ break;
+ case DA9217_VARIANT_VRC:
+ type = "DA9217";
+ config_match = (chip_id == DA9121_TYPE_DA9217);
+ break;
+ default:
+ type = "Unknown";
+ break;
+ }
+
+ dev_info(chip->dev,
+ "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
+ device_id, variant_id, type);
+
+ if (!config_match) {
+ dev_err(chip->dev, "Device tree configuration '%s' does not match detected device.\n", name);
+ ret = -EINVAL;
+ goto error;
+ }
+
+ variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
+ >> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
+
+ if ((device_id == DA9121_DEVICE_ID) &&
+ (variant_mrc < DA9121_VARIANT_MRC_BASE)) {
+ dev_err(chip->dev,
+ "Cannot support variant MRC: 0x%02X\n", variant_mrc);
+ ret = -EINVAL;
+ }
+error:
+ return ret;
+}
+
+static int da9121_assign_chip_model(struct i2c_client *i2c,
+ struct da9121 *chip)
+{
+ struct regmap_config *regmap;
+ int ret = 0;
+
+ chip->dev = &i2c->dev;
+
+ switch (chip->variant_id) {
+ case DA9121_TYPE_DA9121_DA9130:
+ fallthrough;
+ case DA9121_TYPE_DA9217:
+ regmap = &da9121_1ch_regmap_config;
+ break;
+ case DA9121_TYPE_DA9122_DA9131:
+ fallthrough;
+ case DA9121_TYPE_DA9220_DA9132:
+ regmap = &da9121_2ch_regmap_config;
+ break;
+ }
+
+ chip->regmap = devm_regmap_init_i2c(i2c, regmap);
+ if (IS_ERR(chip->regmap)) {
+ ret = PTR_ERR(chip->regmap);
+ dev_err(chip->dev, "Failed to configure a register map: %d\n",
+ ret);
+ }
+
+ ret = da9121_check_device_type(i2c, chip);
+
+ return ret;
+}
+
static const struct of_device_id da9121_dt_ids[] = {
{ .compatible = "dlg,da9121", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
{ .compatible = "dlg,da9130", .data = (void *) DA9121_TYPE_DA9121_DA9130 },
@@ -89,7 +298,6 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
struct device *dev = &i2c->dev;
struct regulator_config config = {};
struct regulator_dev *rdev;
- struct regmap *regmap;

chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
if (!chip) {
@@ -99,13 +307,13 @@ static int da9121_i2c_probe(struct i2c_client *i2c,

chip->variant_id = da9121_of_get_id(&i2c->dev);

- regmap = devm_regmap_init_i2c(i2c, &da9121_regmap_config);
- if (IS_ERR(regmap))
- return PTR_ERR(regmap);
+ ret = da9121_assign_chip_model(i2c, chip);
+ if (ret < 0)
+ goto error;

config.dev = &i2c->dev;
config.of_node = dev->of_node;
- config.regmap = regmap;
+ config.regmap = chip->regmap;

rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
if (IS_ERR(rdev)) {
diff --git a/include/linux/regulator/da9121.h b/include/linux/regulator/da9121.h
new file mode 100644
index 0000000..c31180d
--- /dev/null
+++ b/include/linux/regulator/da9121.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * DA9121 Single-channel dual-phase 10A buck converter
+ * DA9130 Single-channel dual-phase 10A buck converter (Automotive)
+ * DA9217 Single-channel dual-phase 6A buck converter
+ * DA9122 Dual-channel single-phase 5A buck converter
+ * DA9131 Dual-channel single-phase 5A buck converter (Automotive)
+ * DA9220 Dual-channel single-phase 3A buck converter
+ * DA9132 Dual-channel single-phase 3A buck converter (Automotive)
+ *
+ * Copyright (C) 2020 Dialog Semiconductor
+ *
+ * Authors: Adam Ward, Dialog Semiconductor
+ */
+
+#ifndef __LINUX_REGULATOR_DA9121_H
+#define __LINUX_REGULATOR_DA9121_H
+
+enum {
+ DA9121_IDX_BUCK1,
+ DA9121_IDX_BUCK2,
+ DA9121_IDX_MAX
+};
+
+#endif
--
1.9.1
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