1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // Copyright (c) 2019 Mantas Pucka <mantas@8devices.com> |
4 | // Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr> |
5 | // |
6 | // Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator |
7 | |
8 | #include <linux/io.h> |
9 | #include <linux/module.h> |
10 | #include <linux/of.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/regmap.h> |
13 | #include <linux/regulator/driver.h> |
14 | #include <linux/regulator/machine.h> |
15 | #include <linux/regulator/of_regulator.h> |
16 | |
17 | static const unsigned int ipq4019_vmmc_voltages[] = { |
18 | 1500000, 1800000, 2500000, 3000000, |
19 | }; |
20 | |
21 | static const struct regulator_ops ipq4019_regulator_voltage_ops = { |
22 | .list_voltage = regulator_list_voltage_table, |
23 | .map_voltage = regulator_map_voltage_ascend, |
24 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
25 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
26 | }; |
27 | |
28 | static const struct regulator_desc vmmc_regulator = { |
29 | .name = "vmmcq" , |
30 | .ops = &ipq4019_regulator_voltage_ops, |
31 | .type = REGULATOR_VOLTAGE, |
32 | .owner = THIS_MODULE, |
33 | .volt_table = ipq4019_vmmc_voltages, |
34 | .n_voltages = ARRAY_SIZE(ipq4019_vmmc_voltages), |
35 | .vsel_reg = 0, |
36 | .vsel_mask = 0x3, |
37 | }; |
38 | |
39 | static const struct regmap_config ipq4019_vmmcq_regmap_config = { |
40 | .reg_bits = 32, |
41 | .reg_stride = 4, |
42 | .val_bits = 32, |
43 | }; |
44 | |
45 | static int ipq4019_regulator_probe(struct platform_device *pdev) |
46 | { |
47 | struct device *dev = &pdev->dev; |
48 | struct regulator_init_data *init_data; |
49 | struct regulator_config cfg = {}; |
50 | struct regulator_dev *rdev; |
51 | struct regmap *rmap; |
52 | void __iomem *base; |
53 | |
54 | init_data = of_get_regulator_init_data(dev, node: dev->of_node, |
55 | desc: &vmmc_regulator); |
56 | if (!init_data) |
57 | return -EINVAL; |
58 | |
59 | base = devm_platform_ioremap_resource(pdev, index: 0); |
60 | if (IS_ERR(ptr: base)) |
61 | return PTR_ERR(ptr: base); |
62 | |
63 | rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config); |
64 | if (IS_ERR(ptr: rmap)) |
65 | return PTR_ERR(ptr: rmap); |
66 | |
67 | cfg.dev = dev; |
68 | cfg.init_data = init_data; |
69 | cfg.of_node = dev->of_node; |
70 | cfg.regmap = rmap; |
71 | |
72 | rdev = devm_regulator_register(dev, regulator_desc: &vmmc_regulator, config: &cfg); |
73 | if (IS_ERR(ptr: rdev)) { |
74 | dev_err(dev, "Failed to register regulator: %ld\n" , |
75 | PTR_ERR(rdev)); |
76 | return PTR_ERR(ptr: rdev); |
77 | } |
78 | platform_set_drvdata(pdev, data: rdev); |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | static const struct of_device_id regulator_ipq4019_of_match[] = { |
84 | { .compatible = "qcom,vqmmc-ipq4019-regulator" , }, |
85 | {}, |
86 | }; |
87 | |
88 | static struct platform_driver ipq4019_regulator_driver = { |
89 | .probe = ipq4019_regulator_probe, |
90 | .driver = { |
91 | .name = "vqmmc-ipq4019-regulator" , |
92 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
93 | .of_match_table = of_match_ptr(regulator_ipq4019_of_match), |
94 | }, |
95 | }; |
96 | module_platform_driver(ipq4019_regulator_driver); |
97 | |
98 | MODULE_LICENSE("GPL" ); |
99 | MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>" ); |
100 | MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator" ); |
101 | |