[net-next PATCH 1/2] net: phy: introduce phy_id_compare_vendor() PHY ID helper

[net-next PATCH 1/2] net: phy: introduce phy_id_compare_vendor() PHY ID helper

[Christian Marangi]

Introduce phy_id_compare_vendor() PHY ID helper to compare a PHY ID with
the PHY ID Vendor using the generic PHY ID Vendor mask.

While at it also rework the PHY_ID_MATCH macro and move the mask to
dedicated define so that PHY driver can make use of the mask if needed.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 include/linux/phy.h | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 74c1bcf64b3c..173567b86617 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1260,9 +1260,13 @@ struct phy_driver {
 #define to_phy_driver(d) container_of_const(to_mdio_common_driver(d),		\
 				      struct phy_driver, mdiodrv)
 
-#define PHY_ID_MATCH_EXACT(id) .phy_id = (id), .phy_id_mask = GENMASK(31, 0)
-#define PHY_ID_MATCH_MODEL(id) .phy_id = (id), .phy_id_mask = GENMASK(31, 4)
-#define PHY_ID_MATCH_VENDOR(id) .phy_id = (id), .phy_id_mask = GENMASK(31, 10)
+#define PHY_ID_MATCH_EXTACT_MASK GENMASK(31, 0)
+#define PHY_ID_MATCH_MODEL_MASK GENMASK(31, 4)
+#define PHY_ID_MATCH_VENDOR_MASK GENMASK(31, 10)
+
+#define PHY_ID_MATCH_EXACT(id) .phy_id = (id), .phy_id_mask = PHY_ID_MATCH_EXTACT_MASK
+#define PHY_ID_MATCH_MODEL(id) .phy_id = (id), .phy_id_mask = PHY_ID_MATCH_MODEL_MASK
+#define PHY_ID_MATCH_VENDOR(id) .phy_id = (id), .phy_id_mask = PHY_ID_MATCH_VENDOR_MASK
 
 /**
  * phy_id_compare - compare @id1 with @id2 taking account of @mask
@@ -1278,6 +1282,19 @@ static inline bool phy_id_compare(u32 id1, u32 id2, u32 mask)
 	return !((id1 ^ id2) & mask);
 }
 
+/**
+ * phy_id_compare_vendor - compare @id with @vendor mask
+ * @id: PHY ID
+ * @vendor: PHY Vendor mask
+ *
+ * Return true if the bits from @id match @vendor using the
+ * generic PHY Vendor mask.
+ */
+static inline bool phy_id_compare_vendor(u32 id, u32 vendor_mask)
+{
+	return phy_id_compare(id, vendor_mask, PHY_ID_MATCH_VENDOR_MASK);
+}
+
 /**
  * phydev_id_compare - compare @id with the PHY's Clause 22 ID
  * @phydev: the PHY device
-- 
2.50.0

[net-next PATCH 2/2] net: phy: as21xxx: better handle PHY HW reset on soft-reboot

[Christian Marangi]

On soft-reboot, with a reset GPIO defined for an Aeonsemi PHY, the
special match_phy_device fails to correctly identify that the PHY
needs to load the firmware again.

This is caused by the fact that PHY ID is read BEFORE the PHY reset
GPIO (if present) is asserted, so we can be in the scenario where the
phydev have the previous PHY ID (with the PHY firmware loaded) but
after reset the generic AS21xxx PHY is present in the PHY ID registers.

To better handle this, skip reading the PHY ID register only for the PHY
that are not AS21xxx (by matching for the Aeonsemi Vendor) and always
read the PHY ID for the other case to handle both firmware already
loaded or an HW reset.

Fixes: 830877d89edc ("net: phy: Add support for Aeonsemi AS21xxx PHYs")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/net/phy/as21xxx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/as21xxx.c b/drivers/net/phy/as21xxx.c
index 92697f43087d..005277360656 100644
--- a/drivers/net/phy/as21xxx.c
+++ b/drivers/net/phy/as21xxx.c
@@ -884,11 +884,12 @@ static int as21xxx_match_phy_device(struct phy_device *phydev,
 	u32 phy_id;
 	int ret;
 
-	/* Skip PHY that are not AS21xxx or already have firmware loaded */
-	if (phydev->c45_ids.device_ids[MDIO_MMD_PCS] != PHY_ID_AS21XXX)
+	/* Skip PHY that are not AS21xxx */
+	if (!phy_id_compare_vendor(phydev->c45_ids.device_ids[MDIO_MMD_PCS],
+				   PHY_VENDOR_AEONSEMI))
 		return genphy_match_phy_device(phydev, phydrv);
 
-	/* Read PHY ID to handle firmware just loaded */
+	/* Read PHY ID to handle firmware loaded or HW reset */
 	ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MII_PHYSID1);
 	if (ret < 0)
 		return ret;
-- 
2.50.0

Re: [net-next PATCH 1/2] net: phy: introduce phy_id_compare_vendor() PHY ID helper

[Jakub Kicinski]

On Tue, 19 Aug 2025 18:41:40 +0200 Christian Marangi wrote:
> + * Return true if the bits from @id match @vendor using the
            ^
  missing colon, Return:, to make kdoc happy

> + * generic PHY Vendor mask.
-- 
pw-bot: cr