generic: mt7530: backport support for the MT7988 built-in switch

Backport commits adding support for the MT7988 built-in switch to the
mt7530 driver.

This change results in the Kconfig symbol NET_DSA_MT7530 to be extended
by NET_DSA_MT7530_MDIO (everything formally covered by NET_DSA_MT7530)
and NET_DSA_MT7530_MMIO (a new driver for the MMIO-connected built-in
switch of the MT7988 SoC).

Select NET_DSA_MT7530_MDIO for all targets previously selecting
NET_DSA_MT7530, with the exception of mediatek/filogic which also
selects NET_DSA_MT7530_MMIO.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 958fdf36e35c814eb83faf2c39db4ca379c921b5)

1 files changed, 55 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/790-v6.4-0009-net-dsa-mt7530-introduce-mt7530_remove_common-helper.patch b/target/linux/generic/backport-5.15/790-v6.4-0009-net-dsa-mt7530-introduce-mt7530_remove_common-helper.patch
new file mode 100644
index 0000000000..2881365ec7
--- /dev/null
+++ b/target/linux/generic/backport-5.15/790-v6.4-0009-net-dsa-mt7530-introduce-mt7530_remove_common-helper.patch
@@ -0,0 +1,55 @@
+From 720d736351761574af02ed093658ab60de60576c Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Mon, 3 Apr 2023 02:18:50 +0100
+Subject: [PATCH 12/16] net: dsa: mt7530: introduce mt7530_remove_common helper
+ function
+
+Move commonly used parts from mt7530_remove into new
+mt7530_remove_common helper function which will be used by both,
+mt7530_remove and the to-be-introduced mt7988_remove.
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/dsa/mt7530.c | 18 ++++++++++++------
+ 1 file changed, 12 insertions(+), 6 deletions(-)
+
+--- a/drivers/net/dsa/mt7530.c
++++ b/drivers/net/dsa/mt7530.c
+@@ -3253,6 +3253,17 @@ mt7530_probe(struct mdio_device *mdiodev
+ }
+ 
+ static void
++mt7530_remove_common(struct mt7530_priv *priv)
++{
++	if (priv->irq)
++		mt7530_free_irq(priv);
++
++	dsa_unregister_switch(priv->ds);
++
++	mutex_destroy(&priv->reg_mutex);
++}
++
++static void
+ mt7530_remove(struct mdio_device *mdiodev)
+ {
+ 	struct mt7530_priv *priv = dev_get_drvdata(&mdiodev->dev);
+@@ -3271,16 +3282,11 @@ mt7530_remove(struct mdio_device *mdiode
+ 		dev_err(priv->dev, "Failed to disable io pwr: %d\n",
+ 			ret);
+ 
+-	if (priv->irq)
+-		mt7530_free_irq(priv);
+-
+-	dsa_unregister_switch(priv->ds);
++	mt7530_remove_common(priv);
+ 
+ 	for (i = 0; i < 2; ++i)
+ 		mtk_pcs_lynxi_destroy(priv->ports[5 + i].sgmii_pcs);
+ 
+-	mutex_destroy(&priv->reg_mutex);
+-
+ 	dev_set_drvdata(&mdiodev->dev, NULL);
+ }
+