openwrt/target/linux/generic/backport-6.1/790-04-v6.4-net-dsa-mt7530-refactor-SGMII-PCS-creation.patch

From 8f83ad87e2df26ddf9b8afd4d2873644a872d929 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Mon, 3 Apr 2023 02:17:30 +0100
Subject: [PATCH 04/48] net: dsa: mt7530: refactor SGMII PCS creation

Instead of macro templates use a dedidated function and allocated
regmap_config when creating the regmaps for the pcs-mtk-lynxi
instances.
This is in preparation to switching to use unlocked regmap accessors
and have regmap's locking API handle locking for us.

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 | 74 +++++++++++++++++++++++++++-------------
 1 file changed, 50 insertions(+), 24 deletions(-)

--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -3001,26 +3001,56 @@ static const struct regmap_bus mt7531_re
 	.reg_update_bits = mt7530_regmap_update_bits,
 };
 
-#define MT7531_PCS_REGMAP_CONFIG(_name, _reg_base) \
-	{				\
-		.name = _name,		\
-		.reg_bits = 16,		\
-		.val_bits = 32,		\
-		.reg_stride = 4,	\
-		.reg_base = _reg_base,	\
-		.max_register = 0x17c,	\
+static int
+mt7531_create_sgmii(struct mt7530_priv *priv)
+{
+	struct regmap_config *mt7531_pcs_config[2];
+	struct phylink_pcs *pcs;
+	struct regmap *regmap;
+	int i, ret = 0;
+
+	for (i = 0; i < 2; i++) {
+		mt7531_pcs_config[i] = devm_kzalloc(priv->dev,
+						    sizeof(struct regmap_config),
+						    GFP_KERNEL);
+		if (!mt7531_pcs_config[i]) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		mt7531_pcs_config[i]->name = i ? "port6" : "port5";
+		mt7531_pcs_config[i]->reg_bits = 16;
+		mt7531_pcs_config[i]->val_bits = 32;
+		mt7531_pcs_config[i]->reg_stride = 4;
+		mt7531_pcs_config[i]->reg_base = MT7531_SGMII_REG_BASE(5 + i);
+		mt7531_pcs_config[i]->max_register = 0x17c;
+
+		regmap = devm_regmap_init(priv->dev,
+					  &mt7531_regmap_bus, priv,
+					  mt7531_pcs_config[i]);
+		if (IS_ERR(regmap)) {
+			ret = PTR_ERR(regmap);
+			break;
+		}
+		pcs = mtk_pcs_lynxi_create(priv->dev, regmap,
+					   MT7531_PHYA_CTRL_SIGNAL3, 0);
+		if (!pcs) {
+			ret = -ENXIO;
+			break;
+		}
+		priv->ports[5 + i].sgmii_pcs = pcs;
 	}
 
-static const struct regmap_config mt7531_pcs_config[] = {
-	MT7531_PCS_REGMAP_CONFIG("port5", MT7531_SGMII_REG_BASE(5)),
-	MT7531_PCS_REGMAP_CONFIG("port6", MT7531_SGMII_REG_BASE(6)),
-};
+	if (ret && i)
+		mtk_pcs_lynxi_destroy(priv->ports[5].sgmii_pcs);
+
+	return ret;
+}
 
 static int
 mt753x_setup(struct dsa_switch *ds)
 {
 	struct mt7530_priv *priv = ds->priv;
-	struct regmap *regmap;
 	int i, ret;
 
 	/* Initialise the PCS devices */
@@ -3042,15 +3072,11 @@ mt753x_setup(struct dsa_switch *ds)
 	if (ret && priv->irq)
 		mt7530_free_irq_common(priv);
 
-	if (priv->id == ID_MT7531)
-		for (i = 0; i < 2; i++) {
-			regmap = devm_regmap_init(ds->dev,
-						  &mt7531_regmap_bus, priv,
-						  &mt7531_pcs_config[i]);
-			priv->ports[5 + i].sgmii_pcs =
-				mtk_pcs_lynxi_create(ds->dev, regmap,
-						     MT7531_PHYA_CTRL_SIGNAL3, 0);
-		}
+	if (priv->id == ID_MT7531) {
+		ret = mt7531_create_sgmii(priv);
+		if (ret && priv->irq)
+			mt7530_free_irq_common(priv);
+	}
 
 	return ret;
 }