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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cbf919bd JE |
2 | /* |
3 | * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY | |
4 | * | |
5 | * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com> | |
cbf919bd JE |
6 | */ |
7 | ||
8 | #include <linux/clk.h> | |
9 | #include <linux/err.h> | |
10 | #include <linux/mfd/syscon.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/of.h> | |
13 | #include <linux/phy/phy.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/regmap.h> | |
16 | ||
17 | /* USB OTG PHY register offset and bit in CREG */ | |
18 | #define LPC18XX_CREG_CREG0 0x004 | |
19 | #define LPC18XX_CREG_CREG0_USB0PHY BIT(5) | |
20 | ||
21 | struct lpc18xx_usb_otg_phy { | |
22 | struct phy *phy; | |
23 | struct clk *clk; | |
24 | struct regmap *reg; | |
25 | }; | |
26 | ||
27 | static int lpc18xx_usb_otg_phy_init(struct phy *phy) | |
28 | { | |
29 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
30 | int ret; | |
31 | ||
cfd093bb JE |
32 | /* The PHY must be clocked at 480 MHz */ |
33 | ret = clk_set_rate(lpc->clk, 480000000); | |
cbf919bd JE |
34 | if (ret) |
35 | return ret; | |
36 | ||
cfd093bb | 37 | return clk_prepare(lpc->clk); |
cbf919bd JE |
38 | } |
39 | ||
40 | static int lpc18xx_usb_otg_phy_exit(struct phy *phy) | |
41 | { | |
42 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
43 | ||
44 | clk_unprepare(lpc->clk); | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int lpc18xx_usb_otg_phy_power_on(struct phy *phy) | |
50 | { | |
51 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
52 | int ret; | |
53 | ||
54 | ret = clk_enable(lpc->clk); | |
55 | if (ret) | |
56 | return ret; | |
57 | ||
58 | /* The bit in CREG is cleared to enable the PHY */ | |
124380cb | 59 | ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, |
cbf919bd | 60 | LPC18XX_CREG_CREG0_USB0PHY, 0); |
124380cb AK |
61 | if (ret) { |
62 | clk_disable(lpc->clk); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | return 0; | |
cbf919bd JE |
67 | } |
68 | ||
69 | static int lpc18xx_usb_otg_phy_power_off(struct phy *phy) | |
70 | { | |
71 | struct lpc18xx_usb_otg_phy *lpc = phy_get_drvdata(phy); | |
72 | int ret; | |
73 | ||
74 | ret = regmap_update_bits(lpc->reg, LPC18XX_CREG_CREG0, | |
75 | LPC18XX_CREG_CREG0_USB0PHY, | |
76 | LPC18XX_CREG_CREG0_USB0PHY); | |
77 | if (ret) | |
78 | return ret; | |
79 | ||
80 | clk_disable(lpc->clk); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static const struct phy_ops lpc18xx_usb_otg_phy_ops = { | |
86 | .init = lpc18xx_usb_otg_phy_init, | |
87 | .exit = lpc18xx_usb_otg_phy_exit, | |
88 | .power_on = lpc18xx_usb_otg_phy_power_on, | |
89 | .power_off = lpc18xx_usb_otg_phy_power_off, | |
90 | .owner = THIS_MODULE, | |
91 | }; | |
92 | ||
93 | static int lpc18xx_usb_otg_phy_probe(struct platform_device *pdev) | |
94 | { | |
95 | struct phy_provider *phy_provider; | |
96 | struct lpc18xx_usb_otg_phy *lpc; | |
97 | ||
98 | lpc = devm_kzalloc(&pdev->dev, sizeof(*lpc), GFP_KERNEL); | |
99 | if (!lpc) | |
100 | return -ENOMEM; | |
101 | ||
102 | lpc->reg = syscon_node_to_regmap(pdev->dev.of_node->parent); | |
103 | if (IS_ERR(lpc->reg)) { | |
104 | dev_err(&pdev->dev, "failed to get syscon\n"); | |
105 | return PTR_ERR(lpc->reg); | |
106 | } | |
107 | ||
108 | lpc->clk = devm_clk_get(&pdev->dev, NULL); | |
109 | if (IS_ERR(lpc->clk)) { | |
110 | dev_err(&pdev->dev, "failed to get clock\n"); | |
111 | return PTR_ERR(lpc->clk); | |
112 | } | |
113 | ||
114 | lpc->phy = devm_phy_create(&pdev->dev, NULL, &lpc18xx_usb_otg_phy_ops); | |
115 | if (IS_ERR(lpc->phy)) { | |
116 | dev_err(&pdev->dev, "failed to create PHY\n"); | |
117 | return PTR_ERR(lpc->phy); | |
118 | } | |
119 | ||
120 | phy_set_drvdata(lpc->phy, lpc); | |
121 | ||
122 | phy_provider = devm_of_phy_provider_register(&pdev->dev, | |
123 | of_phy_simple_xlate); | |
124 | ||
125 | return PTR_ERR_OR_ZERO(phy_provider); | |
126 | } | |
127 | ||
128 | static const struct of_device_id lpc18xx_usb_otg_phy_match[] = { | |
129 | { .compatible = "nxp,lpc1850-usb-otg-phy" }, | |
130 | { } | |
131 | }; | |
132 | MODULE_DEVICE_TABLE(of, lpc18xx_usb_otg_phy_match); | |
133 | ||
134 | static struct platform_driver lpc18xx_usb_otg_phy_driver = { | |
135 | .probe = lpc18xx_usb_otg_phy_probe, | |
136 | .driver = { | |
137 | .name = "lpc18xx-usb-otg-phy", | |
138 | .of_match_table = lpc18xx_usb_otg_phy_match, | |
139 | }, | |
140 | }; | |
141 | module_platform_driver(lpc18xx_usb_otg_phy_driver); | |
142 | ||
143 | MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>"); | |
144 | MODULE_DESCRIPTION("NXP LPC18xx/43xx USB OTG PHY driver"); | |
145 | MODULE_LICENSE("GPL v2"); |