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+From patchwork Tue Apr 30 05:01:33 2024
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+From: =?utf-8?b?QXLEsW7DpyDDnE5BTCB2aWEgQjQgUmVsYXk=?=
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+ <[email protected]>
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+Date: Tue, 30 Apr 2024 08:01:33 +0300
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+Subject: [PATCH net-next v2] net: dsa: mt7530: detect PHY muxing when PHY
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+ is defined on switch MDIO bus
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+ <20240430-b4-for-netnext-mt7530-use-switch-mdio-bus-for-phy-muxing-v2-1-9104d886d0db@arinc9.com>
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+To: Daniel Golle <[email protected]>, DENG Qingfang <[email protected]>,
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+ Sean Wang <[email protected]>, Andrew Lunn <[email protected]>,
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+ Florian Fainelli <[email protected]>,
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+ Vladimir Oltean <[email protected]>,
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+ "David S. Miller" <[email protected]>, Eric Dumazet <[email protected]>,
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+ Jakub Kicinski <[email protected]>, Paolo Abeni <[email protected]>,
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+ Matthias Brugger <[email protected]>,
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+ AngeloGioacchino Del Regno <[email protected]>
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+Cc: Bartel Eerdekens <[email protected]>,
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+Reply-To: [email protected]
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+
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+From: Arınç ÜNAL <[email protected]>
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+
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+Currently, the MT7530 DSA subdriver configures the MT7530 switch to provide
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+direct access to switch PHYs, meaning, the switch PHYs listen on the MDIO
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+bus the switch listens on. The PHY muxing feature makes use of this.
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+
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+This is problematic as the PHY may be attached before the switch is
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+initialised, in which case, the PHY will fail to be attached.
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+
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+Since commit 91374ba537bd ("net: dsa: mt7530: support OF-based registration
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+of switch MDIO bus"), we can describe the switch PHYs on the MDIO bus of
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+the switch on the device tree. Extend the check to detect PHY muxing when
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+the PHY is defined on the MDIO bus of the switch on the device tree.
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+
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+When the PHY is described this way, the switch will be initialised first,
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+then the switch MDIO bus will be registered. Only after these steps, the
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+PHY will be attached.
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+
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+Signed-off-by: Arınç ÜNAL <[email protected]>
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+---
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+Changes in v2:
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+- Address the terminology on the patch log.
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+- Link to v1: https://lore.kernel.org/r/20240429-b4-for-netnext-mt7530-use-switch-mdio-bus-for-phy-muxing-v1-1-1f775983e155@arinc9.com
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+---
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+ drivers/net/dsa/mt7530.c | 3 ++-
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+ 1 file changed, 2 insertions(+), 1 deletion(-)
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+
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+
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+---
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+base-commit: 5c4c0edca68a5841a8d53ccd49596fe199c8334c
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+change-id: 20240429-b4-for-netnext-mt7530-use-switch-mdio-bus-for-phy-muxing-586269371c55
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+
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+Best regards,
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+
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+--- a/drivers/net/dsa/mt7530.c
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++++ b/drivers/net/dsa/mt7530.c
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+@@ -2488,7 +2488,8 @@ mt7530_setup(struct dsa_switch *ds)
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+ if (!phy_node)
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+ continue;
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+
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+- if (phy_node->parent == priv->dev->of_node->parent) {
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++ if (phy_node->parent == priv->dev->of_node->parent ||
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++ phy_node->parent->parent == priv->dev->of_node) {
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+ ret = of_get_phy_mode(mac_np, &interface);
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+ if (ret && ret != -ENODEV) {
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+ of_node_put(mac_np);
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Arınç ÜNAL