linux-kernel - [PATCH net-next 1/2] net: phy: aquantia: validate PHY mode on AQR107

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Message-ID: <20231117100958.425354-1-robimarko@gmail.com>
Date:   Fri, 17 Nov 2023 11:09:48 +0100
From:   Robert Marko <robimarko@...il.com>
To:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, ansuelsmth@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Robert Marko <robimarko@...il.com>
Subject: [PATCH net-next 1/2] net: phy: aquantia: validate PHY mode on AQR107

The Aquantia driver is not setting the PHY mode itself, but it does however
still check if the PHY mode set in DTS is one of the supported modes.

However, the set PHY mode does not have to match the actual one, so lets
add update the PHY mode during .config_init and warn if they differ.

Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/net/phy/aquantia/aquantia_main.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index cc4a97741c4a..7711e052e737 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -505,6 +505,21 @@ static void aqr107_chip_info(struct phy_device *phydev)
 		   fw_major, fw_minor, build_id, prov_id);
 }
 
+static void aqr107_validate_mode(struct phy_device *phydev,
+				 phy_interface_t dts_mode)
+{
+	int ret;
+
+	/* Get the actual PHY mode */
+	ret = aqr107_read_status(phydev);
+	if (ret)
+		return;
+
+	if (dts_mode != phydev->interface)
+		phydev_info(phydev, "%s mode is set in DTS while %s mode is actual. Please update your devicetree.\n",
+			    phy_modes(dts_mode), phy_modes(phydev->interface));
+}
+
 static int aqr107_config_init(struct phy_device *phydev)
 {
 	int ret;
@@ -528,6 +543,8 @@ static int aqr107_config_init(struct phy_device *phydev)
 	if (!ret)
 		aqr107_chip_info(phydev);
 
+	aqr107_validate_mode(phydev, phydev->interface);
+
 	return aqr107_set_downshift(phydev, MDIO_AN_VEND_PROV_DOWNSHIFT_DFLT);
 }
 
-- 
2.42.0