net: dsa: microchip: implement get_phy_flags only if needed

The common ksz_get_phy_flags() is used by all the switches to implement
the optional .get_phy_flags DSA operation. It always returns 0 except
for KSZ88X3 switches where an errata has to be handled.

Make ksz_get_phy_flags() ksz88xx-specific.
Remove the get_phy_flags implementation for the switches that don't need
it.

Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20260608-clean-ksz-3rd-v2-3-6e61b7be23c4@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

5 files changed, 19 insertions, 25 deletions

diff --git a/drivers/net/dsa/microchip/ksz8.c b/drivers/net/dsa/microchip/ksz8.c
index 9161326b34fd..ba708ad71c1e 100644
--- a/drivers/net/dsa/microchip/ksz8.c
+++ b/drivers/net/dsa/microchip/ksz8.c
@@ -2361,6 +2361,24 @@ static int ksz8463_phy_write16(struct dsa_switch *ds, int addr, int reg, u16 val
 	return 0;
 }
 
+static u32 ksz88xx_get_phy_flags(struct dsa_switch *ds, int port)
+{
+	struct ksz_device *dev = ds->priv;
+
+	switch (dev->chip_id) {
+	case KSZ88X3_CHIP_ID:
+		/* Silicon Errata Sheet (DS80000830A):
+		 * Port 1 does not work with LinkMD Cable-Testing.
+		 * Port 1 does not respond to received PAUSE control frames.
+		 */
+		if (!port)
+			return MICREL_KSZ8_P1_ERRATA;
+		break;
+	}
+
+	return 0;
+}
+
 static int ksz8_switch_init(struct ksz_device *dev)
 {
 	dev->cpu_port = fls(dev->info->cpu_ports) - 1;
@@ -2508,7 +2526,6 @@ const struct ksz_dev_ops ksz88xx_dev_ops = {
 const struct dsa_switch_ops ksz8463_switch_ops = {
 	.get_tag_protocol	= ksz8463_get_tag_protocol,
 	.connect_tag_protocol   = ksz8463_connect_tag_protocol,
-	.get_phy_flags		= ksz_get_phy_flags,
 	.setup			= ksz8_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= ksz8463_phy_read16,
@@ -2563,7 +2580,6 @@ const struct dsa_switch_ops ksz8463_switch_ops = {
 const struct dsa_switch_ops ksz87xx_switch_ops = {
 	.get_tag_protocol	= ksz87xx_get_tag_protocol,
 	.connect_tag_protocol   = ksz87xx_connect_tag_protocol,
-	.get_phy_flags		= ksz_get_phy_flags,
 	.setup			= ksz8_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= ksz8_phy_read16,
@@ -2621,7 +2637,7 @@ const struct dsa_switch_ops ksz87xx_switch_ops = {
 const struct dsa_switch_ops ksz88xx_switch_ops = {
 	.get_tag_protocol	= ksz88xx_get_tag_protocol,
 	.connect_tag_protocol   = ksz88xx_connect_tag_protocol,
-	.get_phy_flags		= ksz_get_phy_flags,
+	.get_phy_flags		= ksz88xx_get_phy_flags,
 	.setup			= ksz8_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= ksz8_phy_read16,
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index c18bad08a508..a39541d29ad5 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1952,7 +1952,6 @@ const struct ksz_dev_ops ksz9477_dev_ops = {
 const struct dsa_switch_ops ksz9477_switch_ops = {
 	.get_tag_protocol	= ksz9477_get_tag_protocol,
 	.connect_tag_protocol   = ksz9477_connect_tag_protocol,
-	.get_phy_flags		= ksz_get_phy_flags,
 	.setup			= ksz9477_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= ksz9477_phy_read16,
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 81d3ec88e436..5fb151fbf4f3 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2838,24 +2838,6 @@ void ksz_init_mib_timer(struct ksz_device *dev)
 	}
 }
 
-u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
-{
-	struct ksz_device *dev = ds->priv;
-
-	switch (dev->chip_id) {
-	case KSZ88X3_CHIP_ID:
-		/* Silicon Errata Sheet (DS80000830A):
-		 * Port 1 does not work with LinkMD Cable-Testing.
-		 * Port 1 does not respond to received PAUSE control frames.
-		 */
-		if (!port)
-			return MICREL_KSZ8_P1_ERRATA;
-		break;
-	}
-
-	return 0;
-}
-
 void ksz_phylink_mac_link_down(struct phylink_config *config,
 			       unsigned int mode,
 			       phy_interface_t interface)
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 1c22d10eff84..de47498db483 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -444,8 +444,6 @@ void ksz_switch_macaddr_put(struct dsa_switch *ds);
 void ksz_switch_shutdown(struct ksz_device *dev);
 int ksz_handle_wake_reason(struct ksz_device *dev, int port);
 
-u32 ksz_get_phy_flags(struct dsa_switch *ds, int port);
-
 int ksz_sset_count(struct dsa_switch *ds, int port, int sset);
 void ksz_get_ethtool_stats(struct dsa_switch *ds, int port,
 			   uint64_t *buf);
diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 731737fd58d1..57e289637193 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -846,7 +846,6 @@ const struct ksz_dev_ops lan937x_dev_ops = {
 const struct dsa_switch_ops lan937x_switch_ops = {
 	.get_tag_protocol	= lan937x_get_tag_protocol,
 	.connect_tag_protocol   = lan937x_connect_tag_protocol,
-	.get_phy_flags		= ksz_get_phy_flags,
 	.setup			= lan937x_setup,
 	.teardown		= ksz_teardown,
 	.phy_read		= lan937x_phy_read16,