Subject: [PATCH RFC net-next 4/5] net: dsa: b53: switch to using phylink_generic_validate()

From: "Russell King (Oracle)" <[email-masked]>
Date: Thu, 03 Feb 2022 17:31:07 +0000

Switch the Broadcom b53 driver to using the phylink_generic_validate()
implementation by removing its own .phylink_validate method and
associated code.

Signed-off-by: Russell King (Oracle) <[email-masked]>
---
 drivers/net/dsa/b53/b53_common.c | 57 ++++++++------------------------
 drivers/net/dsa/b53/b53_priv.h   |  6 ----
 drivers/net/dsa/b53/b53_serdes.c | 22 ------------
 drivers/net/dsa/b53/b53_serdes.h |  3 --
 drivers/net/dsa/b53/b53_srab.c   |  1 -
 5 files changed, 13 insertions(+), 76 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index a637e44bce0b..50a372dc32ae 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1309,48 +1309,6 @@ void b53_port_event(struct dsa_switch *ds, int port)
 }
 EXPORT_SYMBOL(b53_port_event);
 
-void b53_phylink_validate(struct dsa_switch *ds, int port,
-			  unsigned long *supported,
-			  struct phylink_link_state *state)
-{
-	struct b53_device *dev = ds->priv;
-	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
-
-	if (dev->ops->serdes_phylink_validate)
-		dev->ops->serdes_phylink_validate(dev, port, mask, state);
-
-	/* Allow all the expected bits */
-	phylink_set(mask, Autoneg);
-	phylink_set_port_modes(mask);
-	phylink_set(mask, Pause);
-	phylink_set(mask, Asym_Pause);
-
-	/* With the exclusion of 5325/5365, MII, Reverse MII and 802.3z, we
-	 * support Gigabit, including Half duplex.
-	 *
-	 * FIXME: this is weird - 802.3z is always Gigabit, but we exclude
-	 * it here. Why? This makes no sense.
-	 */
-	if (!(state->interface == PHY_INTERFACE_MODE_MII ||
-	      state->interface == PHY_INTERFACE_MODE_REVMII ||
-	      phy_interface_mode_is_8023z(state->interface) ||
-	      is5325(dev) || is5365(dev))) {
-		phylink_set(mask, 1000baseT_Full);
-		phylink_set(mask, 1000baseT_Half);
-	}
-
-	if (!phy_interface_mode_is_8023z(state->interface)) {
-		phylink_set(mask, 10baseT_Half);
-		phylink_set(mask, 10baseT_Full);
-		phylink_set(mask, 100baseT_Half);
-		phylink_set(mask, 100baseT_Full);
-	}
-
-	linkmode_and(supported, supported, mask);
-	linkmode_and(state->advertising, state->advertising, mask);
-}
-EXPORT_SYMBOL(b53_phylink_validate);
-
 static void b53_phylink_get_caps(struct dsa_switch *ds, int port,
 				 struct phylink_config *config)
 {
@@ -1362,6 +1320,13 @@ static void b53_phylink_get_caps(struct dsa_switch *ds, int port,
 	/* These switches appear to support MII and RevMII too, but beyond
 	 * this, the code gives very few clues. FIXME: We probably need more
 	 * interface modes here.
+	 *
+	 * According to b53_srab_mux_init(), ports 3..5 can support:
+	 *  SGMII, MII, GMII, RGMII or INTERNAL depending on the MUX setting.
+	 * However, the interface mode read from the MUX configuration is
+	 * not passed back to DSA, so phylink uses NA.
+	 * DT can specify RGMII for ports 0, 1.
+	 * For MDIO, port 8 can be RGMII_TXID.
 	 */
 	__set_bit(PHY_INTERFACE_MODE_MII, config->supported_interfaces);
 	__set_bit(PHY_INTERFACE_MODE_REVMII, config->supported_interfaces);
@@ -1369,7 +1334,12 @@ static void b53_phylink_get_caps(struct dsa_switch *ds, int port,
 	config->mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
 		MAC_10 | MAC_100;
 
-	/* 5325/5365 are not capable of gigabit speeds, everything else is */
+	/* 5325/5365 are not capable of gigabit speeds, everything else is.
+	 * Note: the original code also exclulded Gigagbit for MII, RevMII
+	 * and 802.3z modes. MII and RevMII are not able to work above 100M,
+	 * so will be excluded by the generic validator implementation.
+	 * However, the exclusion of Gigabit for 802.3z just seems wrong.
+	 */
 	if (!(is5325(dev) || is5365(dev)))
 		config->mac_capabilities |= MAC_1000;
 
@@ -2288,7 +2258,6 @@ static const struct dsa_switch_ops b53_switch_ops = {
 	.phy_write		= b53_phy_write16,
 	.adjust_link		= b53_adjust_link,
 	.phylink_get_caps	= b53_phylink_get_caps,
-	.phylink_validate	= b53_phylink_validate,
 	.phylink_mac_link_state	= b53_phylink_mac_link_state,
 	.phylink_mac_config	= b53_phylink_mac_config,
 	.phylink_mac_an_restart	= b53_phylink_mac_an_restart,
diff --git a/drivers/net/dsa/b53/b53_priv.h b/drivers/net/dsa/b53/b53_priv.h
index b9d1b4819c5f..a6b339fcb17e 100644
--- a/drivers/net/dsa/b53/b53_priv.h
+++ b/drivers/net/dsa/b53/b53_priv.h
@@ -58,9 +58,6 @@ struct b53_io_ops {
 	void (*serdes_link_set)(struct b53_device *dev, int port,
 				unsigned int mode, phy_interface_t interface,
 				bool link_up);
-	void (*serdes_phylink_validate)(struct b53_device *dev, int port,
-					unsigned long *supported,
-					struct phylink_link_state *state);
 };
 
 #define B53_INVALID_LANE	0xff
@@ -339,9 +336,6 @@ int b53_br_flags(struct dsa_switch *ds, int port,
 		 struct netlink_ext_ack *extack);
 int b53_setup_devlink_resources(struct dsa_switch *ds);
 void b53_port_event(struct dsa_switch *ds, int port);
-void b53_phylink_validate(struct dsa_switch *ds, int port,
-			  unsigned long *supported,
-			  struct phylink_link_state *state);
 int b53_phylink_mac_link_state(struct dsa_switch *ds, int port,
 			       struct phylink_link_state *state);
 void b53_phylink_mac_config(struct dsa_switch *ds, int port,
diff --git a/drivers/net/dsa/b53/b53_serdes.c b/drivers/net/dsa/b53/b53_serdes.c
index 7e1ec51ab4c9..c39c315afa8e 100644
--- a/drivers/net/dsa/b53/b53_serdes.c
+++ b/drivers/net/dsa/b53/b53_serdes.c
@@ -158,28 +158,6 @@ void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
 }
 EXPORT_SYMBOL(b53_serdes_link_set);
 
-void b53_serdes_phylink_validate(struct b53_device *dev, int port,
-				 unsigned long *supported,
-				 struct phylink_link_state *state)
-{
-	u8 lane = b53_serdes_map_lane(dev, port);
-
-	if (lane == B53_INVALID_LANE)
-		return;
-
-	switch (lane) {
-	case 0:
-		phylink_set(supported, 2500baseX_Full);
-		fallthrough;
-	case 1:
-		phylink_set(supported, 1000baseX_Full);
-		break;
-	default:
-		break;
-	}
-}
-EXPORT_SYMBOL(b53_serdes_phylink_validate);
-
 void b53_serdes_phylink_get_caps(struct b53_device *dev, int port,
 				 struct phylink_config *config)
 {
diff --git a/drivers/net/dsa/b53/b53_serdes.h b/drivers/net/dsa/b53/b53_serdes.h
index 8fa24f7001aa..f47d5caa7557 100644
--- a/drivers/net/dsa/b53/b53_serdes.h
+++ b/drivers/net/dsa/b53/b53_serdes.h
@@ -117,9 +117,6 @@ void b53_serdes_link_set(struct b53_device *dev, int port, unsigned int mode,
 			 phy_interface_t interface, bool link_up);
 void b53_serdes_phylink_get_caps(struct b53_device *dev, int port,
 				 struct phylink_config *config);
-void b53_serdes_phylink_validate(struct b53_device *dev, int port,
-				unsigned long *supported,
-				struct phylink_link_state *state);
 #if IS_ENABLED(CONFIG_B53_SERDES)
 int b53_serdes_init(struct b53_device *dev, int port);
 #else
diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index 7d72f3b293d3..c51b716657db 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -496,7 +496,6 @@ static const struct b53_io_ops b53_srab_ops = {
 	.serdes_config = b53_serdes_config,
 	.serdes_an_restart = b53_serdes_an_restart,
 	.serdes_link_set = b53_serdes_link_set,
-	.serdes_phylink_validate = b53_serdes_phylink_validate,
 #endif
 };
 
-- 
2.30.2