net: sun8i_emac: Test the correct phy

H3/H5 can either use the internal phy or an external one.
Before getting clock and resets for the internal phy,
test that we are using it because otherwise it break emac
when using an external phy.

Tested-on: OrangePi PC2 (H5)
Fixes: 2348453c41 (net: sun8i_emac: Add EPHY CLK and RESET support)
Signed-off-by: Emmanuel Vadot <manu@freebsd.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 21 insertions, 8 deletions

diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c
index c0a440886e2..0629b16e57c 100644
--- a/drivers/net/sun8i_emac.c
+++ b/drivers/net/sun8i_emac.c
@@ -846,31 +846,44 @@ static const struct eth_ops sun8i_emac_eth_ops = {
 
 static int sun8i_get_ephy_nodes(struct emac_eth_dev *priv)
 {
-	int node, ret;
+	int emac_node, ephy_node, ret, ephy_handle;
+
+	emac_node = fdt_path_offset(gd->fdt_blob,
+				    "/soc/ethernet@1c30000");
+	if (emac_node < 0) {
+		debug("failed to get emac node\n");
+		return emac_node;
+	}
+	ephy_handle = fdtdec_lookup_phandle(gd->fdt_blob,
+					    emac_node, "phy-handle");
 
 	/* look for mdio-mux node for internal PHY node */
-	node = fdt_path_offset(gd->fdt_blob,
-			"/soc/ethernet@1c30000/mdio-mux/mdio@1/ethernet-phy@1");
-	if (node < 0) {
+	ephy_node = fdt_path_offset(gd->fdt_blob,
+				    "/soc/ethernet@1c30000/mdio-mux/mdio@1/ethernet-phy@1");
+	if (ephy_node < 0) {
 		debug("failed to get mdio-mux with internal PHY\n");
-		return node;
+		return ephy_node;
 	}
 
-	ret = fdt_node_check_compatible(gd->fdt_blob, node,
+	/* This is not the phy we are looking for */
+	if (ephy_node != ephy_handle)
+		return 0;
+
+	ret = fdt_node_check_compatible(gd->fdt_blob, ephy_node,
 					"allwinner,sun8i-h3-mdio-internal");
 	if (ret < 0) {
 		debug("failed to find mdio-internal node\n");
 		return ret;
 	}
 
-	ret = clk_get_by_index_nodev(offset_to_ofnode(node), 0,
+	ret = clk_get_by_index_nodev(offset_to_ofnode(ephy_node), 0,
 				     &priv->ephy_clk);
 	if (ret) {
 		dev_err(dev, "failed to get EPHY TX clock\n");
 		return ret;
 	}
 
-	ret = reset_get_by_index_nodev(offset_to_ofnode(node), 0,
+	ret = reset_get_by_index_nodev(offset_to_ofnode(ephy_node), 0,
 				       &priv->ephy_rst);
 	if (ret) {
 		dev_err(dev, "failed to get EPHY TX reset\n");