Add USB VBUS regulator for RZ/G2L

Merge series from Biju Das <biju.das.jz@bp.renesas.com>:

As per RZ/G2L HW manual, VBUS enable can be controlled by the VBOUT bit of
the VBUS Control Register(VBENCTL) register in the USBPHY Control. But
this IP is in the Reset block.

Reset driver exposes this register as regmap and instantiate the USB VBUS
regulator device. Consumers(phy device) can use regulator APIs to control
VBUS as controlling is done in the atomic context using a new API which
is added for the purpose.

7 files changed, 137 insertions, 23 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index d333be2bea3b..0281a9a6f4ce 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1634,6 +1634,15 @@ config REGULATOR_UNIPHIER
 	help
 	  Support for regulators implemented on Socionext UniPhier SoCs.
 
+config REGULATOR_RZG2L_VBCTRL
+	tristate "Renesas RZ/G2L USB VBUS regulator driver"
+	depends on ARCH_RZG2L || COMPILE_TEST
+	depends on OF
+	select REGMAP_MMIO
+	default ARCH_RZG2L
+	help
+	  Support for VBUS regulators implemented on Renesas RZ/G2L SoCs.
+
 config REGULATOR_VCTRL
 	tristate "Voltage controlled regulators"
 	depends on OF
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index ba15fa5f30ad..6127ffb4b011 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -189,6 +189,7 @@ obj-$(CONFIG_REGULATOR_TPS65132) += tps65132-regulator.o
 obj-$(CONFIG_REGULATOR_TPS68470) += tps68470-regulator.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o twl6030-regulator.o
 obj-$(CONFIG_REGULATOR_UNIPHIER) += uniphier-regulator.o
+obj-$(CONFIG_REGULATOR_RZG2L_VBCTRL) += renesas-usb-vbus-regulator.o
 obj-$(CONFIG_REGULATOR_VCTRL) += vctrl-regulator.o
 obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress-regulator.o
 obj-$(CONFIG_REGULATOR_VQMMC_IPQ4019) += vqmmc-ipq4019-regulator.o
diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c
index 34fcdd82b2ea..f3c447ecdc3b 100644
--- a/drivers/regulator/axp20x-regulator.c
+++ b/drivers/regulator/axp20x-regulator.c
@@ -140,7 +140,7 @@
 
 #define AXP717_DCDC1_NUM_VOLTAGES	88
 #define AXP717_DCDC2_NUM_VOLTAGES	107
-#define AXP717_DCDC3_NUM_VOLTAGES	104
+#define AXP717_DCDC3_NUM_VOLTAGES	103
 #define AXP717_DCDC_V_OUT_MASK		GENMASK(6, 0)
 #define AXP717_LDO_V_OUT_MASK		GENMASK(4, 0)
 
@@ -763,10 +763,15 @@ static const struct linear_range axp717_dcdc1_ranges[] = {
 	REGULATOR_LINEAR_RANGE(1220000, 71, 87, 20000),
 };
 
+/*
+ * The manual says that the last voltage is 3.4V, encoded as 0b1101011 (107),
+ * but every other method proves that this is wrong, so it's really 106 that
+ * programs the final 3.4V.
+ */
 static const struct linear_range axp717_dcdc2_ranges[] = {
 	REGULATOR_LINEAR_RANGE(500000,   0,  70,  10000),
 	REGULATOR_LINEAR_RANGE(1220000, 71,  87,  20000),
-	REGULATOR_LINEAR_RANGE(1600000, 88, 107, 100000),
+	REGULATOR_LINEAR_RANGE(1600000, 88, 106, 100000),
 };
 
 static const struct linear_range axp717_dcdc3_ranges[] = {
@@ -790,40 +795,40 @@ static const struct regulator_desc axp717_regulators[] = {
 	AXP_DESC(AXP717, DCDC4, "dcdc4", "vin4", 1000, 3700, 100,
 		 AXP717_DCDC4_CONTROL, AXP717_DCDC_V_OUT_MASK,
 		 AXP717_DCDC_OUTPUT_CONTROL, BIT(3)),
-	AXP_DESC(AXP717, ALDO1, "aldo1", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, ALDO1, "aldo1", "aldoin", 500, 3500, 100,
 		 AXP717_ALDO1_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(0)),
-	AXP_DESC(AXP717, ALDO2, "aldo2", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, ALDO2, "aldo2", "aldoin", 500, 3500, 100,
 		 AXP717_ALDO2_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(1)),
-	AXP_DESC(AXP717, ALDO3, "aldo3", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, ALDO3, "aldo3", "aldoin", 500, 3500, 100,
 		 AXP717_ALDO3_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(2)),
-	AXP_DESC(AXP717, ALDO4, "aldo4", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, ALDO4, "aldo4", "aldoin", 500, 3500, 100,
 		 AXP717_ALDO4_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(3)),
-	AXP_DESC(AXP717, BLDO1, "bldo1", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, BLDO1, "bldo1", "bldoin", 500, 3500, 100,
 		 AXP717_BLDO1_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(4)),
-	AXP_DESC(AXP717, BLDO2, "bldo2", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, BLDO2, "bldo2", "bldoin", 500, 3500, 100,
 		 AXP717_BLDO2_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(5)),
-	AXP_DESC(AXP717, BLDO3, "bldo3", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, BLDO3, "bldo3", "bldoin", 500, 3500, 100,
 		 AXP717_BLDO3_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(6)),
-	AXP_DESC(AXP717, BLDO4, "bldo4", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, BLDO4, "bldo4", "bldoin", 500, 3500, 100,
 		 AXP717_BLDO4_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO0_OUTPUT_CONTROL, BIT(7)),
-	AXP_DESC(AXP717, CLDO1, "cldo1", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, CLDO1, "cldo1", "cldoin", 500, 3500, 100,
 		 AXP717_CLDO1_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO1_OUTPUT_CONTROL, BIT(0)),
-	AXP_DESC(AXP717, CLDO2, "cldo2", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, CLDO2, "cldo2", "cldoin", 500, 3500, 100,
 		 AXP717_CLDO2_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO1_OUTPUT_CONTROL, BIT(1)),
-	AXP_DESC(AXP717, CLDO3, "cldo3", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, CLDO3, "cldo3", "cldoin", 500, 3500, 100,
 		 AXP717_CLDO3_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO1_OUTPUT_CONTROL, BIT(2)),
-	AXP_DESC(AXP717, CLDO4, "cldo4", "vin1", 500, 3500, 100,
+	AXP_DESC(AXP717, CLDO4, "cldo4", "cldoin", 500, 3500, 100,
 		 AXP717_CLDO4_CONTROL, AXP717_LDO_V_OUT_MASK,
 		 AXP717_LDO1_OUTPUT_CONTROL, BIT(3)),
 	AXP_DESC(AXP717, CPUSLDO, "cpusldo", "vin1", 500, 1400, 50,
diff --git a/drivers/regulator/bd71815-regulator.c b/drivers/regulator/bd71815-regulator.c
index 26192d55a685..79fbb45297f6 100644
--- a/drivers/regulator/bd71815-regulator.c
+++ b/drivers/regulator/bd71815-regulator.c
@@ -256,7 +256,7 @@ static int buck12_set_hw_dvs_levels(struct device_node *np,
  * 10: 2.50mV/usec	10mV 4uS
  * 11: 1.25mV/usec	10mV 8uS
  */
-static const unsigned int bd7181x_ramp_table[] = { 1250, 2500, 5000, 10000 };
+static const unsigned int bd7181x_ramp_table[] = { 10000, 5000, 2500, 1250 };
 
 static int bd7181x_led_set_current_limit(struct regulator_dev *rdev,
 					int min_uA, int max_uA)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5794f4e9dd52..7674b7f2df14 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3347,6 +3347,7 @@ struct regmap *regulator_get_regmap(struct regulator *regulator)
 
 	return map ? map : ERR_PTR(-EOPNOTSUPP);
 }
+EXPORT_SYMBOL_GPL(regulator_get_regmap);
 
 /**
  * regulator_get_hardware_vsel_register - get the HW voltage selector register
@@ -3408,6 +3409,34 @@ int regulator_list_hardware_vsel(struct regulator *regulator,
 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
 
 /**
+ * regulator_hardware_enable - access the HW for enable/disable regulator
+ * @regulator: regulator source
+ * @enable: true for enable, false for disable
+ *
+ * Request that the regulator be enabled/disabled with the regulator output at
+ * the predefined voltage or current value.
+ *
+ * On success 0 is returned, otherwise a negative errno is returned.
+ */
+int regulator_hardware_enable(struct regulator *regulator, bool enable)
+{
+	struct regulator_dev *rdev = regulator->rdev;
+	const struct regulator_ops *ops = rdev->desc->ops;
+	int ret = -EOPNOTSUPP;
+
+	if (!rdev->exclusive || !ops || !ops->enable || !ops->disable)
+		return ret;
+
+	if (enable)
+		ret = ops->enable(rdev);
+	else
+		ret = ops->disable(rdev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_hardware_enable);
+
+/**
  * regulator_get_linear_step - return the voltage step size between VSEL values
  * @regulator: regulator source
  *
diff --git a/drivers/regulator/renesas-usb-vbus-regulator.c b/drivers/regulator/renesas-usb-vbus-regulator.c
new file mode 100644
index 000000000000..4eceb6b54497
--- /dev/null
+++ b/drivers/regulator/renesas-usb-vbus-regulator.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Renesas USB VBUS output regulator driver
+//
+// Copyright (C) 2024 Renesas Electronics Corporation
+//
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+static const struct regulator_ops rzg2l_usb_vbus_reg_ops = {
+	.enable     = regulator_enable_regmap,
+	.disable    = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_desc rzg2l_usb_vbus_rdesc = {
+	.name = "vbus",
+	.of_match = of_match_ptr("regulator-vbus"),
+	.ops = &rzg2l_usb_vbus_reg_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+	.enable_reg  = 0,
+	.enable_mask = BIT(0),
+	.enable_is_inverted = true,
+	.fixed_uV	= 5000000,
+	.n_voltages	= 1,
+};
+
+static int rzg2l_usb_vbus_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_config config = { };
+	struct device *dev = &pdev->dev;
+	struct regulator_dev *rdev;
+
+	config.regmap = dev_get_regmap(dev->parent, NULL);
+	if (!config.regmap)
+		return dev_err_probe(dev, -ENOENT, "Failed to get regmap\n");
+
+	config.dev = dev;
+	config.of_node = of_get_child_by_name(dev->parent->of_node, "regulator-vbus");
+	if (!config.of_node)
+		return dev_err_probe(dev, -ENODEV, "regulator node not found\n");
+
+	rdev = devm_regulator_register(dev, &rzg2l_usb_vbus_rdesc, &config);
+	if (IS_ERR(rdev)) {
+		of_node_put(config.of_node);
+		return dev_err_probe(dev, PTR_ERR(rdev),
+				     "not able to register vbus regulator\n");
+	}
+
+	of_node_put(config.of_node);
+
+	return 0;
+}
+
+static struct platform_driver rzg2l_usb_vbus_regulator_driver = {
+	.probe = rzg2l_usb_vbus_regulator_probe,
+	.driver	= {
+		.name = "rzg2l-usb-vbus-regulator",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+};
+module_platform_driver(rzg2l_usb_vbus_regulator_driver);
+
+MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
+MODULE_DESCRIPTION("Renesas RZ/G2L USB Vbus Regulator Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/regulator/tps6594-regulator.c b/drivers/regulator/tps6594-regulator.c
index 4a859f4c0f83..ac53792e3fed 100644
--- a/drivers/regulator/tps6594-regulator.c
+++ b/drivers/regulator/tps6594-regulator.c
@@ -653,18 +653,14 @@ static int tps6594_regulator_probe(struct platform_device *pdev)
 		}
 	}
 
-	if (tps->chip_id == LP8764) {
-		nr_buck = ARRAY_SIZE(buck_regs);
-		nr_ldo = 0;
-		nr_types = REGS_INT_NB;
-	} else if (tps->chip_id == TPS65224) {
+	if (tps->chip_id == TPS65224) {
 		nr_buck = ARRAY_SIZE(tps65224_buck_regs);
 		nr_ldo = ARRAY_SIZE(tps65224_ldo_regs);
-		nr_types = REGS_INT_NB;
+		nr_types = TPS65224_REGS_INT_NB;
 	} else {
 		nr_buck = ARRAY_SIZE(buck_regs);
-		nr_ldo = ARRAY_SIZE(tps6594_ldo_regs);
-		nr_types = TPS65224_REGS_INT_NB;
+		nr_ldo = (tps->chip_id == LP8764) ? 0 : ARRAY_SIZE(tps6594_ldo_regs);
+		nr_types = REGS_INT_NB;
 	}
 
 	reg_irq_nb = nr_types * (nr_buck + nr_ldo);