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Merge tag 'kbuild-v6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy...
[J-linux.git] / drivers / net / mdio / fwnode_mdio.c
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 <[email protected]>");
16 MODULE_LICENSE("GPL");
17 MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors");
18
19 static struct pse_control *
20 fwnode_find_pse_control(struct fwnode_handle *fwnode)
21 {
22         struct pse_control *psec;
23         struct device_node *np;
24
25         if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
26                 return NULL;
27
28         np = to_of_node(fwnode);
29         if (!np)
30                 return NULL;
31
32         psec = of_pse_control_get(np);
33         if (PTR_ERR(psec) == -ENOENT)
34                 return NULL;
35
36         return psec;
37 }
38
39 static struct mii_timestamper *
40 fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
41 {
42         struct of_phandle_args arg;
43         int err;
44
45         if (is_acpi_node(fwnode))
46                 return NULL;
47
48         err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
49                                                "timestamper", 1, 0, &arg);
50         if (err == -ENOENT)
51                 return NULL;
52         else if (err)
53                 return ERR_PTR(err);
54
55         if (arg.args_count != 1)
56                 return ERR_PTR(-EINVAL);
57
58         return register_mii_timestamper(arg.np, arg.args[0]);
59 }
60
61 int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
62                                        struct phy_device *phy,
63                                        struct fwnode_handle *child, u32 addr)
64 {
65         int rc;
66
67         rc = fwnode_irq_get(child, 0);
68         /* Don't wait forever if the IRQ provider doesn't become available,
69          * just fall back to poll mode
70          */
71         if (rc == -EPROBE_DEFER)
72                 rc = driver_deferred_probe_check_state(&phy->mdio.dev);
73         if (rc == -EPROBE_DEFER)
74                 return rc;
75
76         if (rc > 0) {
77                 phy->irq = rc;
78                 mdio->irq[addr] = rc;
79         } else {
80                 phy->irq = mdio->irq[addr];
81         }
82
83         if (fwnode_property_read_bool(child, "broken-turn-around"))
84                 mdio->phy_ignore_ta_mask |= 1 << addr;
85
86         fwnode_property_read_u32(child, "reset-assert-us",
87                                  &phy->mdio.reset_assert_delay);
88         fwnode_property_read_u32(child, "reset-deassert-us",
89                                  &phy->mdio.reset_deassert_delay);
90
91         /* Associate the fwnode with the device structure so it
92          * can be looked up later
93          */
94         fwnode_handle_get(child);
95         device_set_node(&phy->mdio.dev, child);
96
97         /* All data is now stored in the phy struct;
98          * register it
99          */
100         rc = phy_device_register(phy);
101         if (rc) {
102                 device_set_node(&phy->mdio.dev, NULL);
103                 fwnode_handle_put(child);
104                 return rc;
105         }
106
107         dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
108                 child, addr);
109         return 0;
110 }
111 EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
112
113 int fwnode_mdiobus_register_phy(struct mii_bus *bus,
114                                 struct fwnode_handle *child, u32 addr)
115 {
116         struct mii_timestamper *mii_ts = NULL;
117         struct pse_control *psec = NULL;
118         struct phy_device *phy;
119         bool is_c45;
120         u32 phy_id;
121         int rc;
122
123         psec = fwnode_find_pse_control(child);
124         if (IS_ERR(psec))
125                 return PTR_ERR(psec);
126
127         mii_ts = fwnode_find_mii_timestamper(child);
128         if (IS_ERR(mii_ts)) {
129                 rc = PTR_ERR(mii_ts);
130                 goto clean_pse;
131         }
132
133         is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
134         if (is_c45 || fwnode_get_phy_id(child, &phy_id))
135                 phy = get_phy_device(bus, addr, is_c45);
136         else
137                 phy = phy_device_create(bus, addr, phy_id, 0, NULL);
138         if (IS_ERR(phy)) {
139                 rc = PTR_ERR(phy);
140                 goto clean_mii_ts;
141         }
142
143         if (is_acpi_node(child)) {
144                 phy->irq = bus->irq[addr];
145
146                 /* Associate the fwnode with the device structure so it
147                  * can be looked up later.
148                  */
149                 phy->mdio.dev.fwnode = fwnode_handle_get(child);
150
151                 /* All data is now stored in the phy struct, so register it */
152                 rc = phy_device_register(phy);
153                 if (rc) {
154                         phy->mdio.dev.fwnode = NULL;
155                         fwnode_handle_put(child);
156                         goto clean_phy;
157                 }
158         } else if (is_of_node(child)) {
159                 rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
160                 if (rc)
161                         goto clean_phy;
162         }
163
164         phy->psec = psec;
165
166         /* phy->mii_ts may already be defined by the PHY driver. A
167          * mii_timestamper probed via the device tree will still have
168          * precedence.
169          */
170         if (mii_ts)
171                 phy->mii_ts = mii_ts;
172
173         return 0;
174
175 clean_phy:
176         phy_device_free(phy);
177 clean_mii_ts:
178         unregister_mii_timestamper(mii_ts);
179 clean_pse:
180         pse_control_put(psec);
181
182         return rc;
183 }
184 EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
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