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Date:   Fri, 20 Nov 2020 12:14:56 +0000
From:   Adam Ward <adam.ward@...semi.com>
To:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 6/9] regulator: da9121: Update registration to support
 multiple buck variants

Checks DT matches tally with variant maximum and register accordingly.

Signed-off-by: Adam Ward <Adam.Ward.opensource@...semi.com>
---
 drivers/regulator/da9121-regulator.c | 81 +++++++++++++++++++++++++++++++-----
 1 file changed, 70 insertions(+), 11 deletions(-)

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index 5020774..13b0aad 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -314,6 +314,69 @@ static struct da9121_pdata *da9121_parse_regulators_dt(struct da9121 *chip)
 }
 #endif
 
+static int da9121_set_regulator_config(struct da9121 *chip)
+{
+	struct regulator_config config = { };
+	unsigned int max_matches = chip->pdata->num_buck;
+	int ret = 0;
+	int i;
+
+	if (max_matches > variant_parameters[chip->variant_id].num_bucks) {
+		dev_err(chip->dev, "Too many regulators in the DT\n");
+		ret = -EINVAL;
+		goto error;
+	}
+
+	for (i = 0; i < max_matches; i++) {
+		const struct regulator_desc *regl_desc =
+			local_da9121_regulators[chip->variant_id][i];
+		int id = regl_desc->id;
+		struct gpio_desc *gpio_ren;
+
+		if (chip->pdata->gpiod_ren[i])
+			gpio_ren = chip->pdata->gpiod_ren[i];
+		else
+			gpio_ren = NULL;
+
+		config.init_data = chip->pdata->init_data[i];
+		config.dev = chip->dev;
+		config.driver_data = chip;
+		config.regmap = chip->regmap;
+		config.of_node = chip->pdata->reg_node[i];
+
+		switch (id) {
+		case DA9121_IDX_BUCK1:
+		case DA9121_IDX_BUCK2:
+			config.ena_gpiod = gpio_ren;
+			break;
+		default:
+			dev_err(chip->dev, "Invalid regulator ID\n");
+			ret = -EINVAL;
+			goto error;
+		}
+
+		/*
+		 * Hand the GPIO descriptor management over to the regulator
+		 * core, remove it from GPIO devres management.
+		 */
+		if (config.ena_gpiod)
+			devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
+
+		chip->rdev[i] = devm_regulator_register(chip->dev,
+					regl_desc,
+					&config);
+		if (IS_ERR(chip->rdev[i])) {
+			dev_err(chip->dev, "Failed to register regulator %s, %d/%d of_map_mode:%p\n",
+				regl_desc->name, (i+1), max_matches, regl_desc->of_map_mode);
+			ret = PTR_ERR(chip->rdev[i]);
+			goto error;
+		}
+	}
+
+error:
+	return ret;
+}
+
 /* 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),
@@ -586,9 +649,6 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 {
 	struct da9121 *chip;
 	int ret = 0;
-	struct device *dev = &i2c->dev;
-	struct regulator_config config = {};
-	struct regulator_dev *rdev;
 
 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
 	if (!chip) {
@@ -606,16 +666,15 @@ static int da9121_i2c_probe(struct i2c_client *i2c,
 	if (!chip->pdata)
 		chip->pdata = da9121_parse_regulators_dt(chip);
 
-	config.dev = &i2c->dev;
-	config.of_node = dev->of_node;
-	config.regmap = chip->regmap;
-
-	rdev = devm_regulator_register(&i2c->dev, &da9121_reg, &config);
-	if (IS_ERR(rdev)) {
-		dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
-		return PTR_ERR(rdev);
+	if (IS_ERR(chip->pdata)) {
+		dev_err(chip->dev, "No regulators defined for the platform\n");
+		return PTR_ERR(chip->pdata);
 	}
 
+	ret = da9121_set_regulator_config(chip);
+	if (ret < 0)
+		goto error;
+
 error:
 	return ret;
 }
-- 
1.9.1

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