[PATCH V3 06/10] regulator: da9121: Add support for device variants via devicetree
From: Adam Ward
Date: Mon Nov 30 2020 - 12:01:07 EST
Add devicetree configuration and device variant parameters. Use the latter
to enable the check and use of parameters specific to dual buck variants.
Signed-off-by: Adam Ward <Adam.Ward.opensource@xxxxxxxxxxx>
---
drivers/regulator/da9121-regulator.c | 119 +++++++++++++++++++++++++++++++++++
include/linux/regulator/da9121.h | 11 ++++
2 files changed, 130 insertions(+)
diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index a717e2b..1f74371 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -14,6 +14,7 @@
// Copyright (C) 2020 Dialog Semiconductor
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
@@ -28,10 +29,67 @@
/* Chip data */
struct da9121 {
struct device *dev;
+ struct da9121_pdata *pdata;
struct regmap *regmap;
int variant_id;
};
+/* Define ranges for different variants, enabling translation to/from
+ * registers. Maximums give scope to allow for transients.
+ */
+struct da9121_range {
+ int val_min;
+ int val_max;
+ int val_stp;
+ int reg_min;
+ int reg_max;
+};
+
+struct da9121_range da9121_10A_2phase_current = {
+ .val_min = 7000000,
+ .val_max = 20000000,
+ .val_stp = 1000000,
+ .reg_min = 1,
+ .reg_max = 14,
+};
+
+struct da9121_range da9121_6A_2phase_current = {
+ .val_min = 7000000,
+ .val_max = 12000000,
+ .val_stp = 1000000,
+ .reg_min = 1,
+ .reg_max = 6,
+};
+
+struct da9121_range da9121_5A_1phase_current = {
+ .val_min = 3500000,
+ .val_max = 10000000,
+ .val_stp = 500000,
+ .reg_min = 1,
+ .reg_max = 14,
+};
+
+struct da9121_range da9121_3A_1phase_current = {
+ .val_min = 3500000,
+ .val_max = 6000000,
+ .val_stp = 500000,
+ .reg_min = 1,
+ .reg_max = 6,
+};
+
+struct da9121_variant_info {
+ int num_bucks;
+ int num_phases;
+ struct da9121_range *current_range;
+};
+
+static const struct da9121_variant_info variant_parameters[] = {
+ { 1, 2, &da9121_10A_2phase_current }, //DA9121_TYPE_DA9121_DA9130
+ { 2, 1, &da9121_3A_1phase_current }, //DA9121_TYPE_DA9220_DA9132
+ { 2, 1, &da9121_5A_1phase_current }, //DA9121_TYPE_DA9122_DA9131
+ { 1, 2, &da9121_6A_2phase_current }, //DA9121_TYPE_DA9217
+};
+
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
@@ -46,6 +104,59 @@ struct da9121 {
[DA9121_IDX_BUCK2] = { .name = "buck2" },
};
+static int da9121_of_parse_cb(struct device_node *np,
+ const struct regulator_desc *desc,
+ struct regulator_config *config)
+{
+ struct da9121 *chip = config->driver_data;
+ struct da9121_pdata *pdata;
+ struct gpio_desc *ena_gpiod;
+
+ if (chip->pdata == NULL) {
+ pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ } else {
+ pdata = chip->pdata;
+ }
+
+ pdata->num_buck++;
+
+ if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
+ dev_err(chip->dev, "Error: excessive regulators for device\n");
+ return -ENODEV;
+ }
+
+ ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
+ GPIOD_OUT_HIGH |
+ GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+ "da9121-enable");
+ if (!IS_ERR(ena_gpiod))
+ config->ena_gpiod = ena_gpiod;
+
+ if (variant_parameters[chip->variant_id].num_bucks == 2) {
+ uint32_t ripple_cancel;
+ uint32_t ripple_reg;
+ int ret;
+
+ if (of_property_read_u32(da9121_matches[pdata->num_buck].of_node,
+ "dlg,ripple-cancel", &ripple_cancel)) {
+ if (pdata->num_buck > 1)
+ ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
+ else
+ ripple_reg = DA9121_REG_BUCK_BUCK1_7;
+
+ ret = regmap_update_bits(chip->regmap, ripple_reg,
+ DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
+ ripple_cancel);
+ if (ret < 0)
+ dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
+ }
+ }
+
+ return 0;
+}
+
#define DA9121_MIN_MV 300
#define DA9121_MAX_MV 1900
#define DA9121_STEP_MV 10
@@ -57,6 +168,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK1,
.name = "da9121",
.of_match = "buck1",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -80,6 +192,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK1,
.name = "DA9220/DA9132 BUCK1",
.of_match = "buck1",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -97,6 +210,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK2,
.name = "DA9220/DA9132 BUCK2",
.of_match = "buck2",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -117,6 +231,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK1,
.name = "DA9122/DA9131 BUCK1",
.of_match = "buck1",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -134,6 +249,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK2,
.name = "DA9122/DA9131 BUCK2",
.of_match = "buck2",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -153,6 +269,7 @@ struct da9121 {
.id = DA9121_IDX_BUCK1,
.name = "DA9217 BUCK1",
.of_match = "buck1",
+ .of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = of_match_ptr("regulators"),
.ops = &da9121_buck_ops,
@@ -415,6 +532,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
goto error;
}
+ chip->pdata = i2c->dev.platform_data;
chip->variant_id = da9121_of_get_id(&i2c->dev);
ret = da9121_assign_chip_model(i2c, chip);
@@ -422,6 +540,7 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
goto error;
config.dev = &i2c->dev;
+ config.driver_data = chip;
config.of_node = dev->of_node;
config.regmap = chip->regmap;
diff --git a/include/linux/regulator/da9121.h b/include/linux/regulator/da9121.h
index c31180d..62d9d257 100644
--- a/include/linux/regulator/da9121.h
+++ b/include/linux/regulator/da9121.h
@@ -16,10 +16,21 @@
#ifndef __LINUX_REGULATOR_DA9121_H
#define __LINUX_REGULATOR_DA9121_H
+#include <linux/regulator/machine.h>
+
+struct gpio_desc;
+
enum {
DA9121_IDX_BUCK1,
DA9121_IDX_BUCK2,
DA9121_IDX_MAX
};
+struct da9121_pdata {
+ int num_buck;
+ struct gpio_desc *gpiod_ren[DA9121_IDX_MAX];
+ struct device_node *reg_node[DA9121_IDX_MAX];
+ struct regulator_init_data *init_data[DA9121_IDX_MAX];
+};
+
#endif
--
1.9.1