On Tue, Dec 15, 2020 at 6:44 PM Calvin Johnson
[off-list ref] wrote:

Introduce fwnode_mdiobus_register() to register PHYs on the  mdiobus.
If the fwnode is DT node, then call of_mdiobus_register().
If it is an ACPI node, then:
        - disable auto probing of mdiobus
        - register mdiobus
        - save fwnode to mdio structure
        - loop over child nodes & register a phy_device for each PHY

...

+/**
+ * fwnode_mdiobus_register - Register mii_bus and create PHYs from fwnode
+ * @mdio: pointer to mii_bus structure
+ * @fwnode: pointer to fwnode of MDIO bus.
+ *
+ * This function registers the mii_bus structure and registers a phy_device
+ * for each child node of @fwnode.
+ */
+int fwnode_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
+{
+       struct fwnode_handle *child;
+       unsigned long long addr;
+       acpi_status status;
+       int ret;
+
+       if (is_of_node(fwnode)) {
+               return of_mdiobus_register(mdio, to_of_node(fwnode));
+       } else if (is_acpi_node(fwnode)) {

I would rather see this as simple as

     if (is_of_node(fwnode))
               return of_mdiobus_register(mdio, to_of_node(fwnode));
     if (is_acpi_node(fwnode))
               return acpi_mdiobus_register(mdio, fwnode);

where the latter one is defined somewhere in drivers/acpi/.

+               /* Mask out all PHYs from auto probing. */
+               mdio->phy_mask = ~0;
+               ret = mdiobus_register(mdio);
+               if (ret)
+                       return ret;
+
+               mdio->dev.fwnode = fwnode;
+       /* Loop over the child nodes and register a phy_device for each PHY */
+               fwnode_for_each_child_node(fwnode, child) {

+                       status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(child),
+                                                      "_ADR", NULL, &addr);
+                       if (ACPI_FAILURE(status)) {

Isn't it fwnode_get_id() now?

+                               pr_debug("_ADR returned %d\n", status);
+                               continue;
+                       }

+                       if (addr < 0 || addr >= PHY_MAX_ADDR)
+                               continue;

addr can't be less than 0.

+                       ret = fwnode_mdiobus_register_phy(mdio, child, addr);
+                       if (ret == -ENODEV)
+                               dev_err(&mdio->dev,
+                                       "MDIO device at address %lld is missing.\n",
+                                       addr);
+               }
+               return 0;
+       }
+       return -EINVAL;
+}

-- 
With Best Regards,
Andy Shevchenko