linux-kernel - [RFC v2 2/4] net: dsa: mt7530: rework mt753[01]

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Message-Id: <20220430130347.15190-3-linux@fw-web.de>
Date:   Sat, 30 Apr 2022 15:03:45 +0200
From:   Frank Wunderlich <linux@...web.de>
To:     linux-mediatek@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Peter Geis <pgwipeout@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [RFC v2 2/4] net: dsa: mt7530: rework mt753[01]_setup

From: Frank Wunderlich <frank-w@...lic-files.de>

Enumerate available cpu-ports instead of using hardcoded constant.

Suggested-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 drivers/net/dsa/mt7530.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 46dee0714382..144c29f8fefc 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2087,11 +2087,12 @@ static int
 mt7530_setup(struct dsa_switch *ds)
 {
 	struct mt7530_priv *priv = ds->priv;
+	struct device_node *dn = NULL;
 	struct device_node *phy_node;
 	struct device_node *mac_np;
 	struct mt7530_dummy_poll p;
 	phy_interface_t interface;
-	struct device_node *dn;
+	struct dsa_port *cpu_dp;
 	u32 id, val;
 	int ret, i;
 
@@ -2099,7 +2100,19 @@ mt7530_setup(struct dsa_switch *ds)
 	 * controller also is the container for two GMACs nodes representing
 	 * as two netdev instances.
 	 */
-	dn = dsa_to_port(ds, MT7530_CPU_PORT)->master->dev.of_node->parent;
+	dsa_switch_for_each_cpu_port(cpu_dp, ds) {
+		dn = cpu_dp->master->dev.of_node->parent;
+		/* It doesn't matter which CPU port is found first,
+		 * their masters should share the same parent OF node
+		 */
+		break;
+	}
+
+	if (!dn) {
+		dev_err(ds->dev, "parent OF node of DSA master not found");
+		return -EINVAL;
+	}
+
 	ds->assisted_learning_on_cpu_port = true;
 	ds->mtu_enforcement_ingress = true;
 
@@ -2260,6 +2273,7 @@ mt7531_setup(struct dsa_switch *ds)
 {
 	struct mt7530_priv *priv = ds->priv;
 	struct mt7530_dummy_poll p;
+	struct dsa_port *cpu_dp;
 	u32 val, id;
 	int ret, i;
 
@@ -2332,8 +2346,11 @@ mt7531_setup(struct dsa_switch *ds)
 				 CORE_PLL_GROUP4, val);
 
 	/* BPDU to CPU port */
-	mt7530_rmw(priv, MT7531_CFC, MT7531_CPU_PMAP_MASK,
-		   BIT(MT7530_CPU_PORT));
+	dsa_switch_for_each_cpu_port(cpu_dp, ds) {
+		mt7530_rmw(priv, MT7531_CFC, MT7531_CPU_PMAP_MASK,
+			   BIT(cpu_dp->index));
+		break;
+	}
 	mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
 		   MT753X_BPDU_CPU_ONLY);
 
-- 
2.25.1