regulator: da9121: Add support for device variants via devicetree

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@diasemi.com>
Link: https://lore.kernel.org/r/5849ce60595aef1018bdde7dcfb54a7397597545.1606755367.git.Adam.Ward.opensource@diasemi.comSigned-off-by: Mark Brown <broonie@kernel.org>

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 @@ static struct of_regulator_match da9121_matches[] = {
 	[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 @@ static const struct regulator_desc da9121_reg = {
 	.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 @@ static const struct regulator_desc da9220_reg[2] = {
 		.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 @@ static const struct regulator_desc da9220_reg[2] = {
 		.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 @@ static const struct regulator_desc da9122_reg[2] = {
 		.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 @@ static const struct regulator_desc da9122_reg[2] = {
 		.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 @@ static const struct regulator_desc da9217_reg = {
 	.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;
 

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