linux-kernel - [PATCH AUTOSEL 4.9 15/21] net: dsa: bcm_sf2: Ensure correct sub-node is parsed

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Message-Id: <20200415114748.15713-15-sashal@kernel.org>
Date:   Wed, 15 Apr 2020 07:47:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 15/21] net: dsa: bcm_sf2: Ensure correct sub-node is parsed

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit afa3b592953bfaecfb4f2f335ec5f935cff56804 ]

When the bcm_sf2 was converted into a proper platform device driver and
used the new dsa_register_switch() interface, we would still be parsing
the legacy DSA node that contained all the port information since the
platform firmware has intentionally maintained backward and forward
compatibility to client programs. Ensure that we do parse the correct
node, which is "ports" per the revised DSA binding.

Fixes: d9338023fb8e ("net: dsa: bcm_sf2: Make it a real platform device driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/bcm_sf2.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index a3a8d7b62f3fb..796571fccba70 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -976,6 +976,7 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 	struct device_node *dn = pdev->dev.of_node;
 	struct b53_platform_data *pdata;
 	struct dsa_switch_ops *ops;
+	struct device_node *ports;
 	struct bcm_sf2_priv *priv;
 	struct b53_device *dev;
 	struct dsa_switch *ds;
@@ -1038,7 +1039,11 @@ static int bcm_sf2_sw_probe(struct platform_device *pdev)
 	spin_lock_init(&priv->indir_lock);
 	mutex_init(&priv->stats_mutex);
 
-	bcm_sf2_identify_ports(priv, dn->child);
+	ports = of_find_node_by_name(dn, "ports");
+	if (ports) {
+		bcm_sf2_identify_ports(priv, ports);
+		of_node_put(ports);
+	}
 
 	priv->irq0 = irq_of_parse_and_map(dn, 0);
 	priv->irq1 = irq_of_parse_and_map(dn, 1);
-- 
2.20.1