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// SPDX-License-Identifier: GPL-2.0-only
/*
* fwnode helpers for the MDIO (Ethernet PHY) API
*
* This file provides helper functions for extracting PHY device information
* out of the fwnode and using it to populate an mii_bus.
*/
#include <linux/acpi.h>
#include <linux/fwnode_mdio.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/pse-pd/pse.h>
MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("FWNODE MDIO bus (Ethernet PHY) accessors");
static struct pse_control *
fwnode_find_pse_control(struct fwnode_handle *fwnode)
{
struct pse_control *psec;
struct device_node *np;
if (!IS_ENABLED(CONFIG_PSE_CONTROLLER))
return NULL;
np = to_of_node(fwnode);
if (!np)
return NULL;
psec = of_pse_control_get(np);
if (PTR_ERR(psec) == -ENOENT)
return NULL;
return psec;
}
static struct mii_timestamper *
fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
{
struct of_phandle_args arg;
int err;
if (is_acpi_node(fwnode))
return NULL;
err = of_parse_phandle_with_fixed_args(to_of_node(fwnode),
"timestamper", 1, 0, &arg);
if (err == -ENOENT)
return NULL;
else if (err)
return ERR_PTR(err);
if (arg.args_count != 1)
return ERR_PTR(-EINVAL);
return register_mii_timestamper(arg.np, arg.args[0]);
}
int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
struct phy_device *phy,
struct fwnode_handle *child, u32 addr)
{
int rc;
rc = fwnode_irq_get(child, 0);
/* Don't wait forever if the IRQ provider doesn't become available,
* just fall back to poll mode
*/
if (rc == -EPROBE_DEFER)
rc = driver_deferred_probe_check_state(&phy->mdio.dev);
if (rc == -EPROBE_DEFER)
return rc;
if (rc > 0) {
phy->irq = rc;
mdio->irq[addr] = rc;
} else {
phy->irq = mdio->irq[addr];
}
if (fwnode_property_read_bool(child, "broken-turn-around"))
mdio->phy_ignore_ta_mask |= 1 << addr;
fwnode_property_read_u32(child, "reset-assert-us",
&phy->mdio.reset_assert_delay);
fwnode_property_read_u32(child, "reset-deassert-us",
&phy->mdio.reset_deassert_delay);
/* Associate the fwnode with the device structure so it
* can be looked up later
*/
fwnode_handle_get(child);
device_set_node(&phy->mdio.dev, child);
/* All data is now stored in the phy struct;
* register it
*/
rc = phy_device_register(phy);
if (rc) {
device_set_node(&phy->mdio.dev, NULL);
fwnode_handle_put(child);
return rc;
}
dev_dbg(&mdio->dev, "registered phy %p fwnode at address %i\n",
child, addr);
return 0;
}
EXPORT_SYMBOL(fwnode_mdiobus_phy_device_register);
int fwnode_mdiobus_register_phy(struct mii_bus *bus,
struct fwnode_handle *child, u32 addr)
{
struct mii_timestamper *mii_ts = NULL;
struct pse_control *psec = NULL;
struct phy_device *phy;
bool is_c45;
u32 phy_id;
int rc;
psec = fwnode_find_pse_control(child);
if (IS_ERR(psec))
return PTR_ERR(psec);
mii_ts = fwnode_find_mii_timestamper(child);
if (IS_ERR(mii_ts)) {
rc = PTR_ERR(mii_ts);
goto clean_pse;
}
is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
if (is_c45 || fwnode_get_phy_id(child, &phy_id))
phy = get_phy_device(bus, addr, is_c45);
else
phy = phy_device_create(bus, addr, phy_id, 0, NULL);
if (IS_ERR(phy)) {
rc = PTR_ERR(phy);
goto clean_mii_ts;
}
if (is_acpi_node(child)) {
phy->irq = bus->irq[addr];
/* Associate the fwnode with the device structure so it
* can be looked up later.
*/
phy->mdio.dev.fwnode = fwnode_handle_get(child);
/* All data is now stored in the phy struct, so register it */
rc = phy_device_register(phy);
if (rc) {
phy->mdio.dev.fwnode = NULL;
fwnode_handle_put(child);
goto clean_phy;
}
} else if (is_of_node(child)) {
rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
if (rc)
goto clean_phy;
}
phy->psec = psec;
/* phy->mii_ts may already be defined by the PHY driver. A
* mii_timestamper probed via the device tree will still have
* precedence.
*/
if (mii_ts)
phy->mii_ts = mii_ts;
return 0;
clean_phy:
phy_device_free(phy);
clean_mii_ts:
unregister_mii_timestamper(mii_ts);
clean_pse:
pse_control_put(psec);
return rc;
}
EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
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