linux-kernel - [PATCH 2/2] net: dsa: mv88e6xxx: Handle single-chip-address OF property

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Message-Id: <20220423131427.237160-2-nathan@nathanrossi.com>
Date:   Sat, 23 Apr 2022 13:14:27 +0000
From:   Nathan Rossi <nathan@...hanrossi.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Nathan Rossi <nathan@...hanrossi.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>
Subject: [PATCH 2/2] net: dsa: mv88e6xxx: Handle single-chip-address OF property

Handle the parsing and use of single chip addressing when the switch has
the single-chip-address property defined. This allows for specifying the
switch as using single chip addressing even when mdio address 0 is used
by another device on the bus. This is a feature of some switches (e.g.
the MV88E6341/MV88E6141) where the switch shares the bus only responding
to the higher 16 addresses.

Signed-off-by: Nathan Rossi <nathan@...hanrossi.com>
---
 drivers/net/dsa/mv88e6xxx/smi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/smi.c b/drivers/net/dsa/mv88e6xxx/smi.c
index a990271b74..1eb31c1563 100644
--- a/drivers/net/dsa/mv88e6xxx/smi.c
+++ b/drivers/net/dsa/mv88e6xxx/smi.c
@@ -171,9 +171,12 @@ static const struct mv88e6xxx_bus_ops mv88e6xxx_smi_indirect_ops = {
 int mv88e6xxx_smi_init(struct mv88e6xxx_chip *chip,
 		       struct mii_bus *bus, int sw_addr)
 {
+	struct device_node *np = chip->dev->of_node;
+
 	if (chip->info->dual_chip)
 		chip->smi_ops = &mv88e6xxx_smi_dual_direct_ops;
-	else if (sw_addr == 0)
+	else if (sw_addr == 0 ||
+		 (np && of_property_read_bool(np, "single-chip-address")))
 		chip->smi_ops = &mv88e6xxx_smi_direct_ops;
 	else if (chip->info->multi_chip)
 		chip->smi_ops = &mv88e6xxx_smi_indirect_ops;
---
2.35.2