1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * PHY driver for NXP LPC18xx/43xx internal USB OTG PHY |
4 | * |
5 | * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com> |
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 | |
32 | /* The PHY must be clocked at 480 MHz */ |
33 | ret = clk_set_rate(clk: lpc->clk, rate: 480000000); |
34 | if (ret) |
35 | return ret; |
36 | |
37 | return clk_prepare(clk: lpc->clk); |
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(clk: 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(clk: lpc->clk); |
55 | if (ret) |
56 | return ret; |
57 | |
58 | /* The bit in CREG is cleared to enable the PHY */ |
59 | ret = regmap_update_bits(map: lpc->reg, LPC18XX_CREG_CREG0, |
60 | LPC18XX_CREG_CREG0_USB0PHY, val: 0); |
61 | if (ret) { |
62 | clk_disable(clk: lpc->clk); |
63 | return ret; |
64 | } |
65 | |
66 | return 0; |
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(map: 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(clk: 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(dev: &pdev->dev, size: sizeof(*lpc), GFP_KERNEL); |
99 | if (!lpc) |
100 | return -ENOMEM; |
101 | |
102 | lpc->reg = syscon_node_to_regmap(np: pdev->dev.of_node->parent); |
103 | if (IS_ERR(ptr: lpc->reg)) { |
104 | dev_err(&pdev->dev, "failed to get syscon\n" ); |
105 | return PTR_ERR(ptr: lpc->reg); |
106 | } |
107 | |
108 | lpc->clk = devm_clk_get(dev: &pdev->dev, NULL); |
109 | if (IS_ERR(ptr: lpc->clk)) { |
110 | dev_err(&pdev->dev, "failed to get clock\n" ); |
111 | return PTR_ERR(ptr: lpc->clk); |
112 | } |
113 | |
114 | lpc->phy = devm_phy_create(dev: &pdev->dev, NULL, ops: &lpc18xx_usb_otg_phy_ops); |
115 | if (IS_ERR(ptr: lpc->phy)) { |
116 | dev_err(&pdev->dev, "failed to create PHY\n" ); |
117 | return PTR_ERR(ptr: lpc->phy); |
118 | } |
119 | |
120 | phy_set_drvdata(phy: lpc->phy, data: lpc); |
121 | |
122 | phy_provider = devm_of_phy_provider_register(&pdev->dev, |
123 | of_phy_simple_xlate); |
124 | |
125 | return PTR_ERR_OR_ZERO(ptr: 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" ); |
146 | |