[PATCH 5/9] regulator: da9121: Add support for device variants via devicetree

From: Adam Ward
Date: Fri Nov 20 2020 - 07:15:28 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 | 157 ++++++++++++++++++++++++++++++++++-
include/linux/regulator/da9121.h | 11 +++
2 files changed, 167 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index 76932ba..5020774 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -1,7 +1,21 @@
// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (C) 2020 Axis Communications AB */
+/* Copyright (C) 2020 Axis Communications AB
+ *
+ * DA9121 Single-channel dual-phase 10A buck converter
+ *
+ * Copyright (C) 2020 Dialog Semiconductor
+ *
+ * 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)
+ *
+ */

#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>
@@ -16,11 +30,68 @@
/* Chip data */
struct da9121 {
struct device *dev;
+ struct da9121_pdata *pdata;
struct regmap *regmap;
struct regulator_dev *rdev[DA9121_IDX_MAX];
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,
@@ -163,6 +234,86 @@ struct da9121 {
[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
};

+#ifdef CONFIG_OF
+static struct da9121_pdata *da9121_parse_regulators_dt(struct da9121 *chip)
+{
+ struct da9121_pdata *pdata;
+ struct device_node *node;
+ int num = 0;
+ int ret = 0;
+ int i, n;
+ enum gpiod_flags flags = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE;
+
+ node = of_get_child_by_name(chip->dev->of_node, "regulators");
+ if (!node) {
+ dev_err(chip->dev, "Regulators node not found\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ num = of_regulator_match(chip->dev, node, da9121_matches,
+ ARRAY_SIZE(da9121_matches));
+ of_node_put(node);
+ if (num < 0) {
+ dev_err(chip->dev, "Failed to match regulators\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* interrupt assumptions require at least one buck to be configured */
+ if (num == 0) {
+ dev_err(chip->dev, "Did not match any regulators in the DT\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->num_buck = num;
+
+ n = 0;
+ for (i = 0; i < ARRAY_SIZE(da9121_matches); i++) {
+ if (!da9121_matches[i].init_data)
+ continue;
+
+ pdata->init_data[n] = da9121_matches[i].init_data;
+ pdata->reg_node[n] = da9121_matches[i].of_node;
+ pdata->gpiod_ren[n] = devm_gpiod_get_from_of_node(chip->dev,
+ da9121_matches[i].of_node,
+ "enable-gpios",
+ 0,
+ flags,
+ "da9121-enable");
+
+ if (IS_ERR(pdata->gpiod_ren[n]))
+ pdata->gpiod_ren[n] = NULL;
+
+ if (variant_parameters[chip->variant_id].num_bucks == 2) {
+ uint32_t ripple_cancel;
+ uint32_t reg = (i ? DA9xxx_REG_BUCK_BUCK2_7
+ : DA9121_REG_BUCK_BUCK1_7);
+ if (!of_property_read_u32(da9121_matches[i].of_node,
+ "dlg,ripple-cancel",
+ &ripple_cancel)) {
+ //write to BUCK_BUCKx_7 : CHx_RIPPLE_CANCEL
+ ret = regmap_update_bits(chip->regmap, reg,
+ DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
+ ripple_cancel);
+ if (ret < 0)
+ dev_err(chip->dev, "Cannot update BUCK register %02x, err: %d\n", reg, ret);
+ }
+ }
+ n++;
+ }
+
+ return pdata;
+}
+#else
+static struct da9121_pdata *da9121_parse_regulators_dt(struct da9121 *chip)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
/* 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),
@@ -445,12 +596,16 @@ 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);
if (ret < 0)
goto error;

+ if (!chip->pdata)
+ chip->pdata = da9121_parse_regulators_dt(chip);
+
config.dev = &i2c->dev;
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