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From:   Otavio Salvador <otavio@ossystems.com.br>
To:     linux-arm-kernel@lists.infradead.org
Cc:     Jason Zhu <jason.zhu@rock-chips.com>,
        Vicent Chi <vicent.chi@rock-chips.com>,
        Andy Yan <andy.yan@rock-chips.com>,
        Philipp Tomsic <philipp.tomsich@theobroma-systems.com>,
        Tony Xie <tony.xie@rock-chips.com>,
        Otavio Salvador <otavio@ossystems.com.br>,
        Liam Girdwood <lgirdwood@gmail.com>,
        linux-kernel@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH 1/4] regulator: rk808: Fix BUCK1/2 voltages on rk805
Date:   Tue, 29 Jan 2019 17:54:21 -0200
Message-Id: <20190129195424.10161-1-otavio@ossystems.com.br>
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Organization: O.S. Systems Software LTDA.
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Sender: linux-kernel-owner@vger.kernel.org
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RK805 has the following voltage range for the BUCK1 and BUCK2 regulators:

From 0.7125V to 1.45V in 12.5mV steps, 1.8V, 2V, 2.2V and 2.3V

, which corresponds to the following values as per the RK805
datasheet:

000 000: 0.7125V
000 001: 0.725V
……
111 011: 1.45V
111 100: 1.8V
111 101: 2.0V
111 110: 2.2V
111 111: 2.3V

This means that the voltage range is not linear and so RK805 can not
reuse the same regulator_ops structure from RK808.

Fix it by creating a list with the correct supported voltage values
for RK805 BUCK1 and BUCK2 regulators.

Tested on a rv1108-elgin-r1 board that now correctly reports a BUCK2
voltage of 2.2V instead of the unsupported value of 1.4875V.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
---

 drivers/regulator/rk808-regulator.c | 53 ++++++++++++++++++++++++-----
 1 file changed, 45 insertions(+), 8 deletions(-)

diff --git a/drivers/regulator/rk808-regulator.c b/drivers/regulator/rk808-regulator.c
index 213b68743cc8..1463c65c85db 100644
--- a/drivers/regulator/rk808-regulator.c
+++ b/drivers/regulator/rk808-regulator.c
@@ -289,6 +289,21 @@ static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 				  RK808_RAMP_RATE_MASK, ramp_value);
 }
 
+static int rk805_set_suspend_voltage(struct regulator_dev *rdev, int uv)
+{
+	unsigned int reg;
+	int sel = regulator_map_voltage_ascend(rdev, uv, uv);
+
+	if (sel < 0)
+		return -EINVAL;
+
+	reg = rdev->desc->vsel_reg + RK808_SLP_REG_OFFSET;
+
+	return regmap_update_bits(rdev->regmap, reg,
+				  rdev->desc->vsel_mask,
+				  sel);
+}
+
 static int rk808_set_suspend_voltage(struct regulator_dev *rdev, int uv)
 {
 	unsigned int reg;
@@ -376,6 +391,19 @@ static struct regulator_ops rk805_reg_ops = {
 		.set_suspend_disable    = rk805_set_suspend_disable,
 };
 
+static struct regulator_ops rk805_buck1_2_ops = {
+		.list_voltage		= regulator_list_voltage_table,
+		.map_voltage		= regulator_map_voltage_ascend,
+		.get_voltage_sel        = regulator_get_voltage_sel_regmap,
+		.set_voltage_sel        = regulator_set_voltage_sel_regmap,
+		.enable                 = regulator_enable_regmap,
+		.disable                = regulator_disable_regmap,
+		.is_enabled             = regulator_is_enabled_regmap,
+		.set_suspend_voltage    = rk805_set_suspend_voltage,
+		.set_suspend_enable     = rk805_set_suspend_enable,
+		.set_suspend_disable    = rk805_set_suspend_disable,
+};
+
 static struct regulator_ops rk805_switch_ops = {
 		.enable                 = regulator_enable_regmap,
 		.disable                = regulator_disable_regmap,
@@ -433,6 +461,17 @@ static struct regulator_ops rk808_switch_ops = {
 	.set_suspend_disable	= rk808_set_suspend_disable,
 };
 
+static const int rk805_buck_1_2_voltages[] = {
+	712500, 725000, 737500, 750000, 762500, 775000, 787500, 800000,
+	812500, 825000, 837500, 850000, 862500, 875000, 887500, 900000,
+	912500, 925000, 937500, 950000, 962500, 975000, 987500, 1000000,
+	1012500, 1025000, 1037500, 1050000, 1062500, 1075000, 1087500, 1100000,
+	1112500, 1125000, 1137500, 1150000, 1162500, 1175000, 1187500, 1200000,
+	1212500, 1225000, 1237500, 1250000, 1262500, 1275000, 1287500, 1300000,
+	1312500, 1325000, 1337500, 1350000, 1362500, 1375000, 1387500, 1400000,
+	1412500, 1425000, 1437500, 1450000, 1800000, 2000000, 2200000, 2300000,
+};
+
 static const struct regulator_desc rk805_reg[] = {
 	{
 		.name = "DCDC_REG1",
@@ -440,11 +479,10 @@ static const struct regulator_desc rk805_reg[] = {
 		.of_match = of_match_ptr("DCDC_REG1"),
 		.regulators_node = of_match_ptr("regulators"),
 		.id = RK805_ID_DCDC1,
-		.ops = &rk805_reg_ops,
+		.ops = &rk805_buck1_2_ops,
 		.type = REGULATOR_VOLTAGE,
-		.min_uV = 712500,
-		.uV_step = 12500,
-		.n_voltages = 64,
+		.n_voltages = ARRAY_SIZE(rk805_buck_1_2_voltages),
+		.volt_table = rk805_buck_1_2_voltages,
 		.vsel_reg = RK805_BUCK1_ON_VSEL_REG,
 		.vsel_mask = RK818_BUCK_VSEL_MASK,
 		.enable_reg = RK805_DCDC_EN_REG,
@@ -456,11 +494,10 @@ static const struct regulator_desc rk805_reg[] = {
 		.of_match = of_match_ptr("DCDC_REG2"),
 		.regulators_node = of_match_ptr("regulators"),
 		.id = RK805_ID_DCDC2,
-		.ops = &rk805_reg_ops,
+		.ops = &rk805_buck1_2_ops,
 		.type = REGULATOR_VOLTAGE,
-		.min_uV = 712500,
-		.uV_step = 12500,
-		.n_voltages = 64,
+		.n_voltages = ARRAY_SIZE(rk805_buck_1_2_voltages),
+		.volt_table = rk805_buck_1_2_voltages,
 		.vsel_reg = RK805_BUCK2_ON_VSEL_REG,
 		.vsel_mask = RK818_BUCK_VSEL_MASK,
 		.enable_reg = RK805_DCDC_EN_REG,
-- 
2.20.1