generic: mt7530: enable PHY configuration using OF

The MT753x switches provide a switch-internal MDIO bus for the embedded
PHYs.

Register a OF sub-node on the switch OF-node for this internal MDIO bus.
This allows to configure the embedded PHYs using device-tree.

Signed-off-by: David Bauer <mail@david-bauer.net>

diff --git a/target/linux/generic/pending-5.15/795-mt7530-register-OF-node-for-internal-MDIO-bus.patch b/target/linux/generic/pending-5.15/795-mt7530-register-OF-node-for-internal-MDIO-bus.patch
new file mode 100644 (file)
index 0000000..f9b88db
--- /dev/null
+++ b/target/linux/generic/pending-5.15/795-mt7530-register-OF-node-for-internal-MDIO-bus.patch
@@ -0,0 +1,43 @@
+From 1d81e51d6d79d9098013b2e8cdd677bae998c5d8 Mon Sep 17 00:00:00 2001
+From: David Bauer <mail@david-bauer.net>
+Date: Fri, 28 Apr 2023 02:22:59 +0200
+Subject: [PATCH 1/2] mt7530: register OF node for internal MDIO bus
+
+The MT753x switches provide a switch-internal MDIO bus for the embedded
+PHYs.
+
+Register a OF sub-node on the switch OF-node for this internal MDIO bus.
+This allows to configure the embedded PHYs using device-tree.
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+---
+ drivers/net/dsa/mt7530.c | 7 ++++++-
+ 1 file changed, 6 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/dsa/mt7530.c
++++ b/drivers/net/dsa/mt7530.c
+@@ -2081,10 +2081,13 @@ mt7530_setup_mdio(struct mt7530_priv *pr
+ {
+       struct dsa_switch *ds = priv->ds;
+       struct device *dev = priv->dev;
++      struct device_node *np, *mnp;
+       struct mii_bus *bus;
+       static int idx;
+       int ret;
+ 
++      np = priv->dev->of_node;
++
+       bus = devm_mdiobus_alloc(dev);
+       if (!bus)
+               return -ENOMEM;
+@@ -2101,7 +2104,9 @@ mt7530_setup_mdio(struct mt7530_priv *pr
+       if (priv->irq)
+               mt7530_setup_mdio_irq(priv);
+ 
+-      ret = devm_mdiobus_register(dev, bus);
++      mnp = of_get_child_by_name(np, "mdio");
++      ret = devm_of_mdiobus_register(dev, bus, mnp);
++      of_node_put(mnp);
+       if (ret) {
+               dev_err(dev, "failed to register MDIO bus: %d\n", ret);
+               if (priv->irq)