1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
5 */
6
7 #include <clk.h>
8 #include <common.h>
9 #include <dm.h>
10 #include <dm/device.h>
11 #include <dm/device_compat.h>
12 #include <generic-phy.h>
13 #include <asm-generic/gpio.h>
14
15 struct nop_phy_priv {
16 struct clk_bulk bulk;
17 #if CONFIG_IS_ENABLED(DM_GPIO)
18 struct gpio_desc reset_gpio;
19 #endif
20 };
21
22 #if CONFIG_IS_ENABLED(DM_GPIO)
nop_phy_reset(struct phy * phy)23 static int nop_phy_reset(struct phy *phy)
24 {
25 struct nop_phy_priv *priv = dev_get_priv(phy->dev);
26
27 /* Return if there is no gpio since it's optional */
28 if (!dm_gpio_is_valid(&priv->reset_gpio))
29 return 0;
30
31 return dm_gpio_set_value(&priv->reset_gpio, true);
32 }
33 #endif
34
nop_phy_init(struct phy * phy)35 static int nop_phy_init(struct phy *phy)
36 {
37 struct nop_phy_priv *priv = dev_get_priv(phy->dev);
38 int ret = 0;
39
40 if (CONFIG_IS_ENABLED(CLK)) {
41 ret = clk_enable_bulk(&priv->bulk);
42 if (ret)
43 return ret;
44 }
45
46 #if CONFIG_IS_ENABLED(DM_GPIO)
47 /* Take phy out of reset */
48 if (dm_gpio_is_valid(&priv->reset_gpio)) {
49 ret = dm_gpio_set_value(&priv->reset_gpio, false);
50 if (ret) {
51 if (CONFIG_IS_ENABLED(CLK))
52 clk_disable_bulk(&priv->bulk);
53 return ret;
54 }
55 }
56 #endif
57 return 0;
58 }
59
nop_phy_probe(struct udevice * dev)60 static int nop_phy_probe(struct udevice *dev)
61 {
62 struct nop_phy_priv *priv = dev_get_priv(dev);
63 int ret = 0;
64
65 if (CONFIG_IS_ENABLED(CLK)) {
66 ret = clk_get_bulk(dev, &priv->bulk);
67 if (ret < 0) {
68 dev_err(dev, "Failed to get clk: %d\n", ret);
69 return ret;
70 }
71 }
72 #if CONFIG_IS_ENABLED(DM_GPIO)
73 ret = gpio_request_by_name(dev, "reset-gpios", 0,
74 &priv->reset_gpio,
75 GPIOD_IS_OUT);
76 #endif
77 if (ret != -ENOENT)
78 return ret;
79
80 return 0;
81 }
82
83 static const struct udevice_id nop_phy_ids[] = {
84 { .compatible = "nop-phy" },
85 { .compatible = "usb-nop-xceiv" },
86 { }
87 };
88
89 static struct phy_ops nop_phy_ops = {
90 .init = nop_phy_init,
91 #if CONFIG_IS_ENABLED(DM_GPIO)
92 .reset = nop_phy_reset,
93 #endif
94 };
95
96 U_BOOT_DRIVER(nop_phy) = {
97 .name = "nop_phy",
98 .id = UCLASS_PHY,
99 .of_match = nop_phy_ids,
100 .ops = &nop_phy_ops,
101 .probe = nop_phy_probe,
102 .priv_auto = sizeof(struct nop_phy_priv),
103 };
104