1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * fwnode helpers for the MDIO (Ethernet PHY) API
4 *
5 * This file provides helper functions for extracting PHY device information
6 * out of the fwnode and using it to populate an mii_bus.
7 */
8
9 #include <linux/acpi.h>
10 #include <linux/fwnode_mdio.h>
11 #include <linux/of.h>
12 #include <linux/phy.h>
13 #include <linux/pse-pd/pse.h>
14
15 MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
16 MODULE_LICENSE("GPL");
17
18 static struct pse_control *
fwnode_find_pse_control(struct fwnode_handle * fwnode)19 fwnode_find_pse_control(struct fwnode_handle *fwnode)
20 {
21 struct pse_control *psec;
22 struct device_node *np;
23
24 if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
25 return NULL;
26
27 np = to_of_node(fwnode);
28 if (!np)
29 return NULL;
30
31 psec = of_pse_control_get(np);
32 if (PTR_ERR(psec) == -ENOENT)
33 return NULL;
34
35 return psec;
36 }
37
38 static struct mii_timestamper *
fwnode_find_mii_timestamper(struct fwnode_handle * fwnode)39 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
40 {
41 struct of_phandle_args arg;
42 int err;
43
44 if (is_acpi_node(fwnode))
45 return NULL;
46
47 err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
48 "timestamper", 1, 0, &arg);
49 if (err == -ENOENT)
50 return NULL;
51 else if (err)
52 return ERR_PTR(err);
53
54 if (arg.args_count != 1)
55 return ERR_PTR(-EINVAL);
56
57 return register_mii_timestamper(arg.np, arg.args[0]);
58 }
59
fwnode_mdiobus_phy_device_register(struct mii_bus * mdio,struct phy_device * phy,struct fwnode_handle * child,u32 addr)60 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
61 struct phy_device *phy,
62 struct fwnode_handle *child, u32 addr)
63 {
64 int rc;
65
66 rc = fwnode_irq_get(child, 0);
67 /* Don't wait forever if the IRQ provider doesn't become available,
68 * just fall back to poll mode
69 */
70 if (rc == -EPROBE_DEFER)
71 rc = driver_deferred_probe_check_state(&phy->mdio.dev);
72 if (rc == -EPROBE_DEFER)
73 return rc;
74
75 if (rc > 0) {
76 phy->irq = rc;
77 mdio->irq[addr] = rc;
78 } else {
79 phy->irq = mdio->irq[addr];
80 }
81
82 if (fwnode_property_read_bool(child, "broken-turn-around"))
83 mdio->phy_ignore_ta_mask |= 1 << addr;
84
85 fwnode_property_read_u32(child, "reset-assert-us",
86 &phy->mdio.reset_assert_delay);
87 fwnode_property_read_u32(child, "reset-deassert-us",
88 &phy->mdio.reset_deassert_delay);
89
90 /* Associate the fwnode with the device structure so it
91 * can be looked up later
92 */
93 fwnode_handle_get(child);
94 device_set_node(&phy->mdio.dev, child);
95
96 /* All data is now stored in the phy struct;
97 * register it
98 */
99 rc = phy_device_register(phy);
100 if (rc) {
101 device_set_node(&phy->mdio.dev, NULL);
102 fwnode_handle_put(child);
103 return rc;
104 }
105
106 dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
107 child, addr);
108 return 0;
109 }
110 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
111
fwnode_mdiobus_register_phy(struct mii_bus * bus,struct fwnode_handle * child,u32 addr)112 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
113 struct fwnode_handle *child, u32 addr)
114 {
115 struct mii_timestamper *mii_ts = NULL;
116 struct pse_control *psec = NULL;
117 struct phy_device *phy;
118 bool is_c45 = false;
119 u32 phy_id;
120 int rc;
121
122 psec = fwnode_find_pse_control(child);
123 if (IS_ERR(psec))
124 return PTR_ERR(psec);
125
126 mii_ts = fwnode_find_mii_timestamper(child);
127 if (IS_ERR(mii_ts)) {
128 rc = PTR_ERR(mii_ts);
129 goto clean_pse;
130 }
131
132 rc = fwnode_property_match_string(child, "compatible",
133 "ethernet-phy-ieee802.3-c45");
134 if (rc >= 0)
135 is_c45 = true;
136
137 if (is_c45 || fwnode_get_phy_id(child, &phy_id))
138 phy = get_phy_device(bus, addr, is_c45);
139 else
140 phy = phy_device_create(bus, addr, phy_id, 0, NULL);
141 if (IS_ERR(phy)) {
142 rc = PTR_ERR(phy);
143 goto clean_mii_ts;
144 }
145
146 if (is_acpi_node(child)) {
147 phy->irq = bus->irq[addr];
148
149 /* Associate the fwnode with the device structure so it
150 * can be looked up later.
151 */
152 phy->mdio.dev.fwnode = fwnode_handle_get(child);
153
154 /* All data is now stored in the phy struct, so register it */
155 rc = phy_device_register(phy);
156 if (rc) {
157 phy->mdio.dev.fwnode = NULL;
158 fwnode_handle_put(child);
159 goto clean_phy;
160 }
161 } else if (is_of_node(child)) {
162 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
163 if (rc)
164 goto clean_phy;
165 }
166
167 phy->psec = psec;
168
169 /* phy->mii_ts may already be defined by the PHY driver. A
170 * mii_timestamper probed via the device tree will still have
171 * precedence.
172 */
173 if (mii_ts)
174 phy->mii_ts = mii_ts;
175
176 return 0;
177
178 clean_phy:
179 phy_device_free(phy);
180 clean_mii_ts:
181 unregister_mii_timestamper(mii_ts);
182 clean_pse:
183 pse_control_put(psec);
184
185 return rc;
186 }
187 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
188