Introduce ksz_parse_dt_phy_config() to validate and parse PHY
configuration from the device tree for KSZ switches. This function
ensures proper setup of internal PHYs by checking `phy-handle`
properties, verifying expected PHY IDs, and handling parent node
mismatches. Sets the PHY mask on the MII bus if validation is
successful. Returns -EINVAL on configuration errors.
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
drivers/net/dsa/microchip/ksz_common.c | 80 ++++++++++++++++++++++++--
1 file changed, 74 insertions(+), 6 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 3909b55857430..cd1a466504180 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2373,6 +2373,77 @@ static void ksz_irq_phy_free(struct ksz_device *dev)
irq_dispose_mapping(ds->user_mii_bus->irq[phy]);
}
+/**
+ * ksz_parse_dt_phy_config - Parse and validate PHY configuration from DT
+ * @dev: pointer to the KSZ device structure
+ * @bus: pointer to the MII bus structure
+ * @mdio_np: pointer to the MDIO node in the device tree
+ *
+ * This function parses and validates PHY configurations for each user port
+ * defined in the device tree for a KSZ switch device. It verifies that the
+ * `phy-handle` properties are correctly set and that the internal PHYs match
+ * expected IDs and parent nodes. Sets up the PHY mask in the MII bus if all
+ * validations pass. Logs error messages for any mismatches or missing data.
+ *
+ * Return: 0 on success, or a negative error code on failure.
+ */
+static int ksz_parse_dt_phy_config(struct ksz_device *dev, struct mii_bus *bus,
+ struct device_node *mdio_np)
+{
+ struct device_node *phy_node, *phy_parent_node;
+ bool phys_are_valid = true;
+ struct dsa_port *dp;
+ u32 phy_id;
+ int ret;
+
+ dsa_switch_for_each_user_port(dp, dev->ds) {
+ if (!dev->info->internal_phy[dp->index])
+ continue;
+
+ phy_node = of_parse_phandle(dp->dn, "phy-handle", 0);
+ if (!phy_node) {
+ dev_err(dev->dev, "failed to parse phy-handle for port %d.\n",
+ dp->index);
+ phys_are_valid = false;
+ continue;
+ }
+
+ phy_parent_node = of_get_parent(phy_node);
+ if (!phy_parent_node) {
+ dev_err(dev->dev, "failed to get PHY-parent node for port %d\n",
+ dp->index);
+ phys_are_valid = false;
+ } else if (dev->info->internal_phy[dp->index] &&
+ phy_parent_node != mdio_np) {
+ dev_err(dev->dev, "PHY-parent node mismatch for port %d, expected %pOF, got %pOF\n",
+ dp->index, mdio_np, phy_parent_node);
+ phys_are_valid = false;
+ } else {
+ ret = of_property_read_u32(phy_node, "reg", &phy_id);
+ if (ret < 0) {
+ dev_err(dev->dev, "failed to read PHY ID for port %d. Error %d\n",
+ dp->index, ret);
+ phys_are_valid = false;
+ } else if (phy_id != dev->phy_addr_map[dp->index]) {
+ dev_err(dev->dev, "PHY ID mismatch for port %d, expected 0x%x, got 0x%x\n",
+ dp->index, dev->phy_addr_map[dp->index],
+ phy_id);
+ phys_are_valid = false;
+ } else {
+ bus->phy_mask |= BIT(phy_id);
+ }
+ }
+
+ of_node_put(phy_node);
+ of_node_put(phy_parent_node);
+ }
+
+ if (!phys_are_valid)
+ return -EINVAL;
+
+ return 0;
+}
+
/**
* ksz_mdio_register - Register and configure the MDIO bus for the KSZ device.
* @dev: Pointer to the KSZ device structure.
@@ -2392,7 +2463,6 @@ static int ksz_mdio_register(struct ksz_device *dev)
struct dsa_switch *ds = dev->ds;
struct device_node *mdio_np;
struct mii_bus *bus;
- struct dsa_port *dp;
int ret, i;
mdio_np = of_get_child_by_name(dev->dev->of_node, "mdio");
@@ -2451,11 +2521,9 @@ static int ksz_mdio_register(struct ksz_device *dev)
snprintf(bus->id, MII_BUS_ID_SIZE, "SMI-%d", ds->index);
}
- dsa_switch_for_each_user_port(dp, dev->ds) {
- if (dev->info->internal_phy[dp->index] &&
- dev->phy_addr_map[dp->index] < PHY_MAX_ADDR)
- bus->phy_mask |= BIT(dev->phy_addr_map[dp->index]);
- }
+ ret = ksz_parse_dt_phy_config(dev, bus, mdio_np);
+ if (ret)
+ goto put_mdio_node;
ds->phys_mii_mask = bus->phy_mask;
bus->parent = ds->dev;
--
2.39.5
