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regulator: Add support for QCOM PMIC VBUS booster

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Some Qualcomm PMICs have the capability to source the VBUS output to
connected peripherals.  This driver will register a regulator to the
regulator list to enable or disable this source by an external driver.

Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
Link: https://lore.kernel.org/r/20200626185516.18018-5-wcheng@codeaurora.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Wesley Cheng 2020-06-26 11:55:14 -07:00 committed by Mark Brown
parent bfa29acd18
commit 4fe66d5a62
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GPG Key ID: 24D68B725D5487D0
3 changed files with 108 additions and 0 deletions
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10
drivers/regulator/Kconfig
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@ -836,6 +836,16 @@ config REGULATOR_QCOM_SPMI
Qualcomm SPMI PMICs as a module. The module will be named
"qcom_spmi-regulator".
config REGULATOR_QCOM_USB_VBUS
tristate "Qualcomm USB Vbus regulator driver"
depends on SPMI || COMPILE_TEST
help
If you say yes to this option, support will be included for the
regulator used to enable the VBUS output.
Say M here if you want to include support for enabling the VBUS output
as a module. The module will be named "qcom_usb_vbus_regulator".
config REGULATOR_RC5T583
tristate "RICOH RC5T583 Power regulators"
depends on MFD_RC5T583

1
drivers/regulator/Makefile
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@ -93,6 +93,7 @@ obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_SMD_RPM) += qcom_smd-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_SPMI) += qcom_spmi-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_USB_VBUS) += qcom_usb_vbus-regulator.o
obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
obj-$(CONFIG_REGULATOR_PV88060) += pv88060-regulator.o

97
drivers/regulator/qcom_usb_vbus-regulator.c Normal file
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@ -0,0 +1,97 @@
// SPDX-License-Identifier: GPL-2.0-only
//
// Qualcomm PMIC VBUS output regulator driver
//
// Copyright (c) 2020, The Linux Foundation. All rights reserved.
#include <linux/module.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
#define CMD_OTG 0x40
#define OTG_EN BIT(0)
#define OTG_CFG 0x53
#define OTG_EN_SRC_CFG BIT(1)
static const struct regulator_ops qcom_usb_vbus_reg_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
};
static struct regulator_desc qcom_usb_vbus_rdesc = {
.name = "usb_vbus",
.ops = &qcom_usb_vbus_reg_ops,
.owner = THIS_MODULE,
.type = REGULATOR_VOLTAGE,
};
static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct regulator_dev *rdev;
struct regmap *regmap;
struct regulator_config config = { };
struct regulator_init_data *init_data;
int ret;
u32 base;
ret = of_property_read_u32(dev->of_node, "reg", &base);
if (ret < 0) {
dev_err(dev, "no base address found\n");
return ret;
}
regmap = dev_get_regmap(dev->parent, NULL);
if (regmap) {
dev_err(dev, "Failed to get regmap\n");
return -ENOENT;
}
init_data = of_get_regulator_init_data(dev, dev->of_node,
&qcom_usb_vbus_rdesc);
if (!init_data)
return -ENOMEM;
qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
config.dev = dev;
config.init_data = init_data;
config.regmap = regmap;
rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(dev, "not able to register vbus reg %d\n", ret);
return ret;
}
/* Disable HW logic for VBUS enable */
regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
return 0;
}
static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
{ .compatible = "qcom,pm8150b-vbus-reg" },
{ }
};
MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
static struct platform_driver qcom_usb_vbus_regulator_driver = {
.driver = {
.name = "qcom-usb-vbus-regulator",
.of_match_table = qcom_usb_vbus_regulator_match,
},
.probe = qcom_usb_vbus_regulator_probe,
};
module_platform_driver(qcom_usb_vbus_regulator_driver);
MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
MODULE_LICENSE("GPL v2");