1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun //
3*4882a593Smuzhiyun // Qualcomm PMIC VBUS output regulator driver
4*4882a593Smuzhiyun //
5*4882a593Smuzhiyun // Copyright (c) 2020, The Linux Foundation. All rights reserved.
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/err.h>
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/of.h>
11*4882a593Smuzhiyun #include <linux/of_device.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <linux/regulator/driver.h>
14*4882a593Smuzhiyun #include <linux/regulator/of_regulator.h>
15*4882a593Smuzhiyun #include <linux/regmap.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define CMD_OTG 0x40
18*4882a593Smuzhiyun #define OTG_EN BIT(0)
19*4882a593Smuzhiyun #define OTG_CFG 0x53
20*4882a593Smuzhiyun #define OTG_EN_SRC_CFG BIT(1)
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun static const struct regulator_ops qcom_usb_vbus_reg_ops = {
23*4882a593Smuzhiyun .enable = regulator_enable_regmap,
24*4882a593Smuzhiyun .disable = regulator_disable_regmap,
25*4882a593Smuzhiyun .is_enabled = regulator_is_enabled_regmap,
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static struct regulator_desc qcom_usb_vbus_rdesc = {
29*4882a593Smuzhiyun .name = "usb_vbus",
30*4882a593Smuzhiyun .ops = &qcom_usb_vbus_reg_ops,
31*4882a593Smuzhiyun .owner = THIS_MODULE,
32*4882a593Smuzhiyun .type = REGULATOR_VOLTAGE,
33*4882a593Smuzhiyun };
34*4882a593Smuzhiyun
qcom_usb_vbus_regulator_probe(struct platform_device * pdev)35*4882a593Smuzhiyun static int qcom_usb_vbus_regulator_probe(struct platform_device *pdev)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun struct device *dev = &pdev->dev;
38*4882a593Smuzhiyun struct regulator_dev *rdev;
39*4882a593Smuzhiyun struct regmap *regmap;
40*4882a593Smuzhiyun struct regulator_config config = { };
41*4882a593Smuzhiyun struct regulator_init_data *init_data;
42*4882a593Smuzhiyun int ret;
43*4882a593Smuzhiyun u32 base;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun ret = of_property_read_u32(dev->of_node, "reg", &base);
46*4882a593Smuzhiyun if (ret < 0) {
47*4882a593Smuzhiyun dev_err(dev, "no base address found\n");
48*4882a593Smuzhiyun return ret;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun regmap = dev_get_regmap(dev->parent, NULL);
52*4882a593Smuzhiyun if (!regmap) {
53*4882a593Smuzhiyun dev_err(dev, "Failed to get regmap\n");
54*4882a593Smuzhiyun return -ENOENT;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun init_data = of_get_regulator_init_data(dev, dev->of_node,
58*4882a593Smuzhiyun &qcom_usb_vbus_rdesc);
59*4882a593Smuzhiyun if (!init_data)
60*4882a593Smuzhiyun return -ENOMEM;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun qcom_usb_vbus_rdesc.enable_reg = base + CMD_OTG;
63*4882a593Smuzhiyun qcom_usb_vbus_rdesc.enable_mask = OTG_EN;
64*4882a593Smuzhiyun config.dev = dev;
65*4882a593Smuzhiyun config.init_data = init_data;
66*4882a593Smuzhiyun config.of_node = dev->of_node;
67*4882a593Smuzhiyun config.regmap = regmap;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun rdev = devm_regulator_register(dev, &qcom_usb_vbus_rdesc, &config);
70*4882a593Smuzhiyun if (IS_ERR(rdev)) {
71*4882a593Smuzhiyun ret = PTR_ERR(rdev);
72*4882a593Smuzhiyun dev_err(dev, "not able to register vbus reg %d\n", ret);
73*4882a593Smuzhiyun return ret;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun /* Disable HW logic for VBUS enable */
77*4882a593Smuzhiyun regmap_update_bits(regmap, base + OTG_CFG, OTG_EN_SRC_CFG, 0);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun return 0;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun static const struct of_device_id qcom_usb_vbus_regulator_match[] = {
83*4882a593Smuzhiyun { .compatible = "qcom,pm8150b-vbus-reg" },
84*4882a593Smuzhiyun { }
85*4882a593Smuzhiyun };
86*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, qcom_usb_vbus_regulator_match);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun static struct platform_driver qcom_usb_vbus_regulator_driver = {
89*4882a593Smuzhiyun .driver = {
90*4882a593Smuzhiyun .name = "qcom-usb-vbus-regulator",
91*4882a593Smuzhiyun .of_match_table = qcom_usb_vbus_regulator_match,
92*4882a593Smuzhiyun },
93*4882a593Smuzhiyun .probe = qcom_usb_vbus_regulator_probe,
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun module_platform_driver(qcom_usb_vbus_regulator_driver);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun MODULE_DESCRIPTION("Qualcomm USB vbus regulator driver");
98*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
99