linux-kernel - [PATCH 1/5] net: mdio: Mask PHY only when its ACPI node is present

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Date:   Wed, 20 Apr 2022 20:40:48 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] net: mdio: Mask PHY only when its ACPI node is present

Not all PHY has an ACPI node, for those nodes auto probing is still
needed.

So only mask those PHYs with ACPI nodes.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/net/mdio/acpi_mdio.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c
index d77c987fda9cd..f9369319ada19 100644
--- a/drivers/net/mdio/acpi_mdio.c
+++ b/drivers/net/mdio/acpi_mdio.c
@@ -33,8 +33,15 @@ int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
 	u32 addr;
 	int ret;
 
-	/* Mask out all PHYs from auto probing. */
-	mdio->phy_mask = GENMASK(31, 0);
+	/* Loop over the child nodes and mask out PHY from auto probing */
+	fwnode_for_each_child_node(fwnode, child) {
+		ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr);
+		if (ret || addr >= PHY_MAX_ADDR)
+			continue;
+
+		mdio->phy_mask |= BIT(addr);
+	}
+
 	ret = mdiobus_register(mdio);
 	if (ret)
 		return ret;
-- 
2.34.1