[PATCH net-next] net: dsa: mt7530: fix support for MT7531BE

[Daniel Golle]

There are two variants of the MT7531 switch IC which got different
features (and pins) regarding port 5:
 * MT7531AE: SGMII/1000Base-X/2500Base-X SerDes
 * MT7531BE: RGMII

Moving the creation of the SerDes PCS from mt753x_setup to mt7530_probe
with commit 6de285229773 ("net: dsa: mt7530: move SGMII PCS creation to
mt7530_probe function") works fine for MT7531AE which got two instances
of mtk-pcs-lynxi, however, MT7531BE requires mt7531_pll_setup to setup
clocks before the single PCS on port 6 (usually used as CPU port)
starts to work and hence the PCS creation failed on MT7531BE.

Fix this by introducing a pointer to mt7531_create_sgmii function in
struct mt7530_priv and call it again at the end of mt753x_setup like it
was before commit 6de285229773 ("net: dsa: mt7530: move SGMII PCS
creation to mt7530_probe function").

Fixes: 6de285229773 ("net: dsa: mt7530: move SGMII PCS creation to mt7530_probe function")
Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
---
 drivers/net/dsa/mt7530-mdio.c | 14 +++++++-------
 drivers/net/dsa/mt7530.c      |  6 ++++++
 drivers/net/dsa/mt7530.h      |  4 ++++
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/net/dsa/mt7530-mdio.c b/drivers/net/dsa/mt7530-mdio.c
index 34a547b88e497..f17eab67d15fa 100644
--- a/drivers/net/dsa/mt7530-mdio.c
+++ b/drivers/net/dsa/mt7530-mdio.c
@@ -81,14 +81,17 @@ static const struct regmap_bus mt7530_regmap_bus = {
 };
 
 static int
-mt7531_create_sgmii(struct mt7530_priv *priv)
+mt7531_create_sgmii(struct mt7530_priv *priv, bool dual_sgmii)
 {
 	struct regmap_config *mt7531_pcs_config[2];
 	struct phylink_pcs *pcs;
 	struct regmap *regmap;
 	int i, ret = 0;
 
-	for (i = 0; i < 2; i++) {
+	/* MT7531AE has two SGMII units for port 5 and port 6
+	 * MT7531BE has only one SGMII unit for port 6
+	 */
+	for (i = dual_sgmii ? 0 : 1; i < 2; i++) {
 		mt7531_pcs_config[i] = devm_kzalloc(priv->dev,
 						    sizeof(struct regmap_config),
 						    GFP_KERNEL);
@@ -208,11 +211,8 @@ mt7530_probe(struct mdio_device *mdiodev)
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);
 
-	if (priv->id == ID_MT7531) {
-		ret = mt7531_create_sgmii(priv);
-		if (ret)
-			return ret;
-	}
+	if (priv->id == ID_MT7531)
+		priv->create_sgmii = mt7531_create_sgmii;
 
 	return dsa_register_switch(priv->ds);
 }
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index e4bb5037d3525..c680873819b01 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -3018,6 +3018,12 @@ mt753x_setup(struct dsa_switch *ds)
 	if (ret && priv->irq)
 		mt7530_free_irq_common(priv);
 
+	if (priv->create_sgmii) {
+		ret = priv->create_sgmii(priv, mt7531_dual_sgmii_supported(priv));
+		if (ret && priv->irq)
+			mt7530_free_irq(priv);
+	}
+
 	return ret;
 }
 
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 01db5c9724fa8..6e89578b4de02 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -752,6 +752,8 @@ struct mt753x_info {
  * @irq:		IRQ number of the switch
  * @irq_domain:		IRQ domain of the switch irq_chip
  * @irq_enable:		IRQ enable bits, synced to SYS_INT_EN
+ *
+ * @create_sgmii:	Pointer to function creating SGMII PCS instance(s)
  */
 struct mt7530_priv {
 	struct device		*dev;
@@ -778,6 +780,8 @@ struct mt7530_priv {
 	int irq;
 	struct irq_domain *irq_domain;
 	u32 irq_enable;
+
+	int (*create_sgmii)(struct mt7530_priv *priv, bool dual_sgmii);
 };
 
 struct mt7530_hw_vlan_entry {
-- 
2.40.0