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regulator: Add Renesas RZ/G2L USB VBUS regulator driver

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As per the RZ/G2L HW manual, VBUSEN can be controlled by the VBOUT
bit of the VBUS Control Register. This register is mapped in the reset
framework. The reset driver expose this register as regmap and instantiates
this driver. The consumer will use the regulator API to control the VBOUT
bit as the control need to be done in the atomic context.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20240616105402.45211-5-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Biju Das 2024-06-16 11:53:56 +01:00 committed by Mark Brown
parent 1cb7d29157
commit 84fbd61987
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GPG Key ID: 24D68B725D5487D0
3 changed files with 84 additions and 0 deletions
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9
drivers/regulator/Kconfig
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@ -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

1
drivers/regulator/Makefile
View File

@ -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

74
drivers/regulator/renesas-usb-vbus-regulator.c Normal file
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@ -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");