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137 lines
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From patchwork Tue Apr 30 05:01:33 2024
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Tue, 30 Apr 2024 05:01:39 +0000 (UTC)
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From: =?utf-8?b?QXLEsW7DpyDDnE5BTCB2aWEgQjQgUmVsYXk=?=
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<devnull+arinc.unal.arinc9.com@kernel.org>
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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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ykGDWUp6yqjVMpXa1mr+qHMDM11XV8dryM7CwEAAA==
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To: Daniel Golle <daniel@makrotopia.org>, DENG Qingfang <dqfext@gmail.com>,
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Sean Wang <sean.wang@mediatek.com>, Andrew Lunn <andrew@lunn.ch>,
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Florian Fainelli <f.fainelli@gmail.com>,
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Vladimir Oltean <olteanv@gmail.com>,
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"David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
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Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
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Matthias Brugger <matthias.bgg@gmail.com>,
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AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
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Cc: Bartel Eerdekens <bartel.eerdekens@constell8.be>,
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mithat.guner@xeront.com, erkin.bozoglu@xeront.com, netdev@vger.kernel.org,
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linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
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linux-mediatek@lists.infradead.org,
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Reply-To: arinc.unal@arinc9.com
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From: Arınç ÜNAL <arinc.unal@arinc9.com>
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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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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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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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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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Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
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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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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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Best regards,
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--- a/drivers/net/dsa/mt7530.c
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+++ b/drivers/net/dsa/mt7530.c
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@@ -2483,7 +2483,8 @@ mt7530_setup(struct dsa_switch *ds)
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if (!phy_node)
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continue;
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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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