1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Atheros AR71XX/9XXX USB PHY driver |
4 | * |
5 | * Copyright (C) 2015-2018 Alban Bedel <albeu@free.fr> |
6 | */ |
7 | |
8 | #include <linux/mod_devicetable.h> |
9 | #include <linux/module.h> |
10 | #include <linux/platform_device.h> |
11 | #include <linux/phy/phy.h> |
12 | #include <linux/reset.h> |
13 | |
14 | struct ath79_usb_phy { |
15 | struct reset_control *reset; |
16 | /* The suspend override logic is inverted, hence the no prefix |
17 | * to make the code a bit easier to understand. |
18 | */ |
19 | struct reset_control *no_suspend_override; |
20 | }; |
21 | |
22 | static int ath79_usb_phy_power_on(struct phy *phy) |
23 | { |
24 | struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
25 | int err = 0; |
26 | |
27 | if (priv->no_suspend_override) { |
28 | err = reset_control_assert(rstc: priv->no_suspend_override); |
29 | if (err) |
30 | return err; |
31 | } |
32 | |
33 | err = reset_control_deassert(rstc: priv->reset); |
34 | if (err && priv->no_suspend_override) |
35 | reset_control_deassert(rstc: priv->no_suspend_override); |
36 | |
37 | return err; |
38 | } |
39 | |
40 | static int ath79_usb_phy_power_off(struct phy *phy) |
41 | { |
42 | struct ath79_usb_phy *priv = phy_get_drvdata(phy); |
43 | int err = 0; |
44 | |
45 | err = reset_control_assert(rstc: priv->reset); |
46 | if (err) |
47 | return err; |
48 | |
49 | if (priv->no_suspend_override) { |
50 | err = reset_control_deassert(rstc: priv->no_suspend_override); |
51 | if (err) |
52 | reset_control_deassert(rstc: priv->reset); |
53 | } |
54 | |
55 | return err; |
56 | } |
57 | |
58 | static const struct phy_ops ath79_usb_phy_ops = { |
59 | .power_on = ath79_usb_phy_power_on, |
60 | .power_off = ath79_usb_phy_power_off, |
61 | .owner = THIS_MODULE, |
62 | }; |
63 | |
64 | static int ath79_usb_phy_probe(struct platform_device *pdev) |
65 | { |
66 | struct ath79_usb_phy *priv; |
67 | struct phy *phy; |
68 | |
69 | priv = devm_kzalloc(dev: &pdev->dev, size: sizeof(*priv), GFP_KERNEL); |
70 | if (!priv) |
71 | return -ENOMEM; |
72 | |
73 | priv->reset = devm_reset_control_get(dev: &pdev->dev, id: "phy" ); |
74 | if (IS_ERR(ptr: priv->reset)) |
75 | return PTR_ERR(ptr: priv->reset); |
76 | |
77 | priv->no_suspend_override = devm_reset_control_get_optional( |
78 | dev: &pdev->dev, id: "usb-suspend-override" ); |
79 | if (IS_ERR(ptr: priv->no_suspend_override)) |
80 | return PTR_ERR(ptr: priv->no_suspend_override); |
81 | |
82 | phy = devm_phy_create(dev: &pdev->dev, NULL, ops: &ath79_usb_phy_ops); |
83 | if (IS_ERR(ptr: phy)) |
84 | return PTR_ERR(ptr: phy); |
85 | |
86 | phy_set_drvdata(phy, data: priv); |
87 | |
88 | return PTR_ERR_OR_ZERO(devm_of_phy_provider_register( |
89 | &pdev->dev, of_phy_simple_xlate)); |
90 | } |
91 | |
92 | static const struct of_device_id ath79_usb_phy_of_match[] = { |
93 | { .compatible = "qca,ar7100-usb-phy" }, |
94 | {} |
95 | }; |
96 | MODULE_DEVICE_TABLE(of, ath79_usb_phy_of_match); |
97 | |
98 | static struct platform_driver ath79_usb_phy_driver = { |
99 | .probe = ath79_usb_phy_probe, |
100 | .driver = { |
101 | .of_match_table = ath79_usb_phy_of_match, |
102 | .name = "ath79-usb-phy" , |
103 | } |
104 | }; |
105 | module_platform_driver(ath79_usb_phy_driver); |
106 | |
107 | MODULE_DESCRIPTION("ATH79 USB PHY driver" ); |
108 | MODULE_AUTHOR("Alban Bedel <albeu@free.fr>" ); |
109 | MODULE_LICENSE("GPL" ); |
110 | |