diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/mdio/fwnode_mdio.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c new file mode 100644 index 000000000..b782c35c4 --- /dev/null +++ b/drivers/net/mdio/fwnode_mdio.c @@ -0,0 +1,187 @@ +// 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"); + +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 = false; + 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; + } + + 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)) { + 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); |