1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - https://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
15struct 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)
23static 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
35static 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
60static 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
83static const struct udevice_id nop_phy_ids[] = {
84	{ .compatible = "nop-phy" },
85	{ .compatible = "usb-nop-xceiv" },
86	{ }
87};
88
89static 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
96U_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