linux-kernel - [PATCH v3 5/6] regulator: rtq2208: Fix LDO to be compatible with both fixed and adjustable vout

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Date: Fri, 10 May 2024 20:06:24 +0800
From: Alina Yu <alina_yu@...htek.com>
To: <lgirdwood@...il.com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<alina_yu@...htek.com>, <johnny_lai@...htek.com>, <cy_huang@...htek.com>
Subject: [PATCH v3 5/6] regulator: rtq2208: Fix LDO to be compatible with both fixed and adjustable vout

In this patch, LDO's adjustable and fixed Vout settings are compatible.
The LDO Vout ability depends on "richtek,fixed-microvolt".
If adjustable, the Vout can be set to either 1800mV or 3300mV.

Signed-off-by: Alina Yu <alina_yu@...htek.com>
---
v3
- Add "richtek,fixed-microvolt" to specify LDO fixed voltage
- Check specified desc->fixed_uV matches with constraints->min_uV and constraints->max_uV
---
 drivers/regulator/rtq2208-regulator.c | 43 ++++++++++++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/rtq2208-regulator.c b/drivers/regulator/rtq2208-regulator.c
index 2e9387f..c2c1689 100644
--- a/drivers/regulator/rtq2208-regulator.c
+++ b/drivers/regulator/rtq2208-regulator.c
@@ -219,7 +219,7 @@ static const struct regulator_ops rtq2208_regulator_buck_ops = {
 	.set_suspend_mode = rtq2208_set_suspend_mode,
 };
 
-static const struct regulator_ops rtq2208_regulator_ldo_ops = {
+static const struct regulator_ops rtq2208_regulator_ldo_fix_ops = {
 	.enable = regulator_enable_regmap,
 	.disable = regulator_disable_regmap,
 	.is_enabled = regulator_is_enabled_regmap,
@@ -228,6 +228,23 @@ static const struct regulator_ops rtq2208_regulator_ldo_ops = {
 	.set_suspend_disable = rtq2208_set_suspend_disable,
 };
 
+static const struct regulator_ops rtq2208_regulator_ldo_adj_ops = {
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_active_discharge = regulator_set_active_discharge_regmap,
+	.set_suspend_enable = rtq2208_set_suspend_enable,
+	.set_suspend_disable = rtq2208_set_suspend_disable,
+};
+
+static const unsigned int rtq2208_ldo_volt_table[] = {
+	1800000,
+	3300000,
+};
+
 static struct of_regulator_match rtq2208_ldo_match[] = {
 	{.name = "ldo2", },
 	{.name = "ldo1", },
@@ -358,8 +375,9 @@ static int rtq2208_of_get_ldo_dvs_ability(struct device *dev)
 {
 	struct device_node *np;
 	struct of_regulator_match *match;
-	struct rtq2208_regulator_desc *rdesc;
+	struct regulator_desc *desc;
 	struct regulator_init_data *init_data;
+	u32 fixed_uV;
 	int ret, i;
 
 	if (!dev->of_node)
@@ -379,13 +397,26 @@ static int rtq2208_of_get_ldo_dvs_ability(struct device *dev)
 	for (i = 0; i < ARRAY_SIZE(rtq2208_ldo_match); i++) {
 		match = rtq2208_ldo_match + i;
 		init_data = match->init_data;
-		rdesc = (struct rtq2208_regulator_desc *)match->driver_data;
+		desc = (struct regulator_desc *)match->desc;
 
-		if (!init_data || !rdesc)
+		if (!init_data || !desc)
 			continue;
 
-		if (init_data->constraints.min_uV == init_data->constraints.max_uV)
-			rdesc->desc.fixed_uV = init_data->constraints.min_uV;
+		/* specify working fixed voltage if the propery exists */
+		ret = of_property_read_u32(match->of_node, "richtek,fixed-microvolt", &fixed_uV);
+
+		if (!ret) {
+			if (fixed_uV != init_data->constraints.min_uV ||
+				fixed_uV != init_data->constraints.max_uV)
+				return -EINVAL;
+			desc->n_voltages = 1;
+			desc->fixed_uV = fixed_uV;
+			desc->ops = &rtq2208_regulator_ldo_fix_ops;
+		} else {
+			desc->n_voltages = ARRAY_SIZE(rtq2208_ldo_volt_table);
+			desc->volt_table = rtq2208_ldo_volt_table;
+			desc->ops = &rtq2208_regulator_ldo_adj_ops;
+		}
 	}
 
 	return 0;
-- 
2.7.4