150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
// 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>
|
|
|
|
MODULE_AUTHOR("Calvin Johnson <calvin.johnson@oss.nxp.com>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
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) {
|
|
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 phy_device *phy;
|
|
bool is_c45 = false;
|
|
u32 phy_id;
|
|
int rc;
|
|
|
|
mii_ts = fwnode_find_mii_timestamper(child);
|
|
if (IS_ERR(mii_ts))
|
|
return PTR_ERR(mii_ts);
|
|
|
|
rc = fwnode_property_match_string(child, "compatible",
|
|
"ethernet-phy-ieee802.3-c45");
|
|
if (rc >= 0)
|
|
is_c45 = true;
|
|
|
|
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)) {
|
|
unregister_mii_timestamper(mii_ts);
|
|
return PTR_ERR(phy);
|
|
}
|
|
|
|
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 = child;
|
|
|
|
/* All data is now stored in the phy struct, so register it */
|
|
rc = phy_device_register(phy);
|
|
if (rc) {
|
|
phy_device_free(phy);
|
|
fwnode_handle_put(phy->mdio.dev.fwnode);
|
|
return rc;
|
|
}
|
|
} else if (is_of_node(child)) {
|
|
rc = fwnode_mdiobus_phy_device_register(bus, phy, child, addr);
|
|
if (rc) {
|
|
unregister_mii_timestamper(mii_ts);
|
|
phy_device_free(phy);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
|