[PATCH v1 net-next 0/3] net: dsa: microchip: add KSZ9893 switch support

[PATCH v1 net-next 0/3] net: dsa: microchip: add KSZ9893 switch support

[Tristram.Ha]

From: Tristram Ha <Tristram.Ha@microchip.com>

This series of patches is to modify the KSZ9477 DSA driver to support
running KSZ9893 switch.

The KSZ9893 switch is similar to KSZ9477 except the ingress tail tag has
1 byte instead of 2 bytes.  The XMII register that governs the MAC
communication also has different register definitions.

v1
- Put KSZ9893 tagging in separate patch
- Remove other switch support

Tristram Ha (3):
  dt-bindings: net: dsa: document additional Microchip KSZ9477 family
    switches
  net: dsa: add KSZ9893 switch tagging support
  net: dsa: microchip: add KSZ9893 switch support

 Documentation/devicetree/bindings/net/dsa/ksz.txt |  43 ++++
 drivers/net/dsa/microchip/ksz9477.c               | 242 ++++++++++++++++++++--
 drivers/net/dsa/microchip/ksz9477_spi.c           |   4 +-
 drivers/net/dsa/microchip/ksz_common.c            |   4 +-
 include/net/dsa.h                                 |   1 +
 net/dsa/dsa.c                                     |   2 +
 net/dsa/dsa_priv.h                                |   1 +
 net/dsa/tag_ksz.c                                 |  34 +++
 8 files changed, 316 insertions(+), 15 deletions(-)

-- 
1.9.1

[PATCH v1 net-next 1/3] dt-bindings: net: dsa: document additional Microchip KSZ9477 family switches

[Tristram.Ha]

From: Tristram Ha <Tristram.Ha@microchip.com>

Document additional Microchip KSZ9477 family switches.

Show how KSZ8565 switch should be configured as the host port is port 7
instead of port 5.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
---
 Documentation/devicetree/bindings/net/dsa/ksz.txt | 43 +++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/ksz.txt b/Documentation/devicetree/bindings/net/dsa/ksz.txt
index 8d58c2a..e7db726 100644
--- a/Documentation/devicetree/bindings/net/dsa/ksz.txt
+++ b/Documentation/devicetree/bindings/net/dsa/ksz.txt
@@ -7,6 +7,11 @@ Required properties:
   of the following:
   - "microchip,ksz9477"
   - "microchip,ksz9897"
+  - "microchip,ksz9896"
+  - "microchip,ksz9567"
+  - "microchip,ksz8565"
+  - "microchip,ksz9893"
+  - "microchip,ksz9563"
 
 Optional properties:
 
@@ -73,4 +78,42 @@ Ethernet switch connected via SPI to the host, CPU port wired to eth0:
 				};
 			};
 		};
+		ksz8565: ksz8565@0 {
+			compatible = "microchip,ksz8565";
+			reg = <0>;
+
+			spi-max-frequency = <44000000>;
+			spi-cpha;
+			spi-cpol;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				port@0 {
+					reg = <0>;
+					label = "lan1";
+				};
+				port@1 {
+					reg = <1>;
+					label = "lan2";
+				};
+				port@2 {
+					reg = <2>;
+					label = "lan3";
+				};
+				port@3 {
+					reg = <3>;
+					label = "lan4";
+				};
+				port@6 {
+					reg = <6>;
+					label = "cpu";
+					ethernet = <&eth0>;
+					fixed-link {
+						speed = <1000>;
+						full-duplex;
+					};
+				};
+			};
+		};
 	};
-- 
1.9.1

[PATCH v1 net-next 2/3] net: dsa: add KSZ9893 switch tagging support

[Tristram.Ha]

From: Tristram Ha <Tristram.Ha@microchip.com>

KSZ9893 switch is similar to KSZ9477 switch except the ingress tail tag
has 1 byte instead of 2 bytes.  The size of the portmap is smaller and
so the override and lookup bits are also moved.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
---
 include/net/dsa.h  |  1 +
 net/dsa/dsa.c      |  2 ++
 net/dsa/dsa_priv.h |  1 +
 net/dsa/tag_ksz.c  | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 38 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index e8ac5b3..ae480bb 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -38,6 +38,7 @@ enum dsa_tag_protocol {
 	DSA_TAG_PROTO_EDSA,
 	DSA_TAG_PROTO_GSWIP,
 	DSA_TAG_PROTO_KSZ9477,
+	DSA_TAG_PROTO_KSZ9893,
 	DSA_TAG_PROTO_LAN9303,
 	DSA_TAG_PROTO_MTK,
 	DSA_TAG_PROTO_QCA,
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index aee909b..36de4f2 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -57,6 +57,7 @@ static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_KSZ9477
 	[DSA_TAG_PROTO_KSZ9477] = &ksz9477_netdev_ops,
+	[DSA_TAG_PROTO_KSZ9893] = &ksz9893_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_LAN9303
 	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
@@ -93,6 +94,7 @@ const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
 #endif
 #ifdef CONFIG_NET_DSA_TAG_KSZ9477
 		[DSA_TAG_PROTO_KSZ9477] = "ksz9477",
+		[DSA_TAG_PROTO_KSZ9893] = "ksz9893",
 #endif
 #ifdef CONFIG_NET_DSA_TAG_LAN9303
 		[DSA_TAG_PROTO_LAN9303] = "lan9303",
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index c6caa58..093b7d1 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -216,6 +216,7 @@ static inline struct dsa_port *dsa_slave_to_port(const struct net_device *dev)
 
 /* tag_ksz.c */
 extern const struct dsa_device_ops ksz9477_netdev_ops;
+extern const struct dsa_device_ops ksz9893_netdev_ops;
 
 /* tag_lan9303.c */
 extern const struct dsa_device_ops lan9303_netdev_ops;
diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 927e9c8..de246c9 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -16,6 +16,7 @@
 
 /* Typically only one byte is used for tail tag. */
 #define KSZ_EGRESS_TAG_LEN		1
+#define KSZ_INGRESS_TAG_LEN		1
 
 static struct sk_buff *ksz_common_xmit(struct sk_buff *skb,
 				       struct net_device *dev, int len)
@@ -141,3 +142,36 @@ static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
 	.rcv	= ksz9477_rcv,
 	.overhead = KSZ9477_INGRESS_TAG_LEN,
 };
+
+#define KSZ9893_TAIL_TAG_OVERRIDE	BIT(5)
+#define KSZ9893_TAIL_TAG_LOOKUP		BIT(6)
+
+static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
+				    struct net_device *dev)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	struct sk_buff *nskb;
+	u8 *addr;
+	u8 *tag;
+
+	nskb = ksz_common_xmit(skb, dev, KSZ_INGRESS_TAG_LEN);
+	if (!nskb)
+		return NULL;
+
+	/* Tag encoding */
+	tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
+	addr = skb_mac_header(nskb);
+
+	*tag = BIT(dp->index);
+
+	if (is_link_local_ether_addr(addr))
+		*tag |= KSZ9893_TAIL_TAG_OVERRIDE;
+
+	return nskb;
+}
+
+const struct dsa_device_ops ksz9893_netdev_ops = {
+	.xmit	= ksz9893_xmit,
+	.rcv	= ksz9477_rcv,
+	.overhead = KSZ_INGRESS_TAG_LEN,
+};
-- 
1.9.1

[PATCH v1 net-next 3/3] net: dsa: microchip: add KSZ9893 switch support

[Tristram.Ha]

From: Tristram Ha <Tristram.Ha@microchip.com>

Add KSZ9893 switch support in KSZ9477 driver.  This switch is similar to
KSZ9477 except the ingress tail tag has 1 byte instead of 2 bytes, so
KSZ9893 tagging will be used.

The XMII register that governs how the host port communicates with the
MAC also has different register definitions.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
---
 drivers/net/dsa/microchip/ksz9477.c     | 242 ++++++++++++++++++++++++++++++--
 drivers/net/dsa/microchip/ksz9477_spi.c |   4 +-
 drivers/net/dsa/microchip/ksz_common.c  |   4 +-
 3 files changed, 235 insertions(+), 15 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 03de50e..f16e1d7 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -18,6 +18,11 @@
 #include "ksz9477_reg.h"
 #include "ksz_common.h"
 
+/* Used with variable features to indicate capabilities. */
+#define GBIT_SUPPORT			BIT(0)
+#define NEW_XMII			BIT(1)
+#define IS_9893				BIT(2)
+
 static const struct {
 	int index;
 	char string[ETH_GSTRING_LEN];
@@ -328,7 +333,12 @@ static void ksz9477_port_init_cnt(struct ksz_device *dev, int port)
 static enum dsa_tag_protocol ksz9477_get_tag_protocol(struct dsa_switch *ds,
 						      int port)
 {
-	return DSA_TAG_PROTO_KSZ9477;
+	enum dsa_tag_protocol proto = DSA_TAG_PROTO_KSZ9477;
+	struct ksz_device *dev = ds->priv;
+
+	if (dev->features & IS_9893)
+		proto = DSA_TAG_PROTO_KSZ9893;
+	return proto;
 }
 
 static int ksz9477_phy_read16(struct dsa_switch *ds, int addr, int reg)
@@ -389,6 +399,10 @@ static int ksz9477_phy_write16(struct dsa_switch *ds, int addr, int reg,
 	/* No real PHY after this. */
 	if (addr >= dev->phy_port_cnt)
 		return 0;
+
+	/* No gigabit support.  Do not write to this register. */
+	if (!(dev->features & GBIT_SUPPORT) && reg == MII_CTRL1000)
+		return 0;
 	ksz_pwrite16(dev, addr, 0x100 + (reg << 1), val);
 
 	return 0;
@@ -998,11 +1012,156 @@ static void ksz9477_port_mirror_del(struct dsa_switch *ds, int port,
 static void ksz9477_phy_setup(struct ksz_device *dev, int port,
 			      struct phy_device *phy)
 {
-	if (port < dev->phy_port_cnt) {
-		/* The MAC actually cannot run in 1000 half-duplex mode. */
+	/* Only apply to port with PHY. */
+	if (port >= dev->phy_port_cnt)
+		return;
+
+	/* The MAC actually cannot run in 1000 half-duplex mode. */
+	phy_remove_link_mode(phy,
+			     ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
+
+	/* PHY does not support gigabit. */
+	if (!(dev->features & GBIT_SUPPORT))
 		phy_remove_link_mode(phy,
-				     ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
+				     ETHTOOL_LINK_MODE_1000baseT_Full_BIT);
+}
+
+static bool ksz9477_get_gbit(struct ksz_device *dev, u8 data)
+{
+	bool gbit;
+
+	if (dev->features & NEW_XMII)
+		gbit = !(data & PORT_MII_NOT_1GBIT);
+	else
+		gbit = !!(data & PORT_MII_1000MBIT_S1);
+	return gbit;
+}
+
+static void ksz9477_set_gbit(struct ksz_device *dev, bool gbit, u8 *data)
+{
+	if (dev->features & NEW_XMII) {
+		if (gbit)
+			*data &= ~PORT_MII_NOT_1GBIT;
+		else
+			*data |= PORT_MII_NOT_1GBIT;
+	} else {
+		if (gbit)
+			*data |= PORT_MII_1000MBIT_S1;
+		else
+			*data &= ~PORT_MII_1000MBIT_S1;
+	}
+}
+
+static int ksz9477_get_xmii(struct ksz_device *dev, u8 data)
+{
+	int mode;
+
+	if (dev->features & NEW_XMII) {
+		switch (data & PORT_MII_SEL_M) {
+		case PORT_MII_SEL:
+			mode = 0;
+			break;
+		case PORT_RMII_SEL:
+			mode = 1;
+			break;
+		case PORT_GMII_SEL:
+			mode = 2;
+			break;
+		default:
+			mode = 3;
+		}
+	} else {
+		switch (data & PORT_MII_SEL_M) {
+		case PORT_MII_SEL_S1:
+			mode = 0;
+			break;
+		case PORT_RMII_SEL_S1:
+			mode = 1;
+			break;
+		case PORT_GMII_SEL_S1:
+			mode = 2;
+			break;
+		default:
+			mode = 3;
+		}
+	}
+	return mode;
+}
+
+static void ksz9477_set_xmii(struct ksz_device *dev, int mode, u8 *data)
+{
+	u8 xmii;
+
+	if (dev->features & NEW_XMII) {
+		switch (mode) {
+		case 0:
+			xmii = PORT_MII_SEL;
+			break;
+		case 1:
+			xmii = PORT_RMII_SEL;
+			break;
+		case 2:
+			xmii = PORT_GMII_SEL;
+			break;
+		default:
+			xmii = PORT_RGMII_SEL;
+			break;
+		}
+	} else {
+		switch (mode) {
+		case 0:
+			xmii = PORT_MII_SEL_S1;
+			break;
+		case 1:
+			xmii = PORT_RMII_SEL_S1;
+			break;
+		case 2:
+			xmii = PORT_GMII_SEL_S1;
+			break;
+		default:
+			xmii = PORT_RGMII_SEL_S1;
+			break;
+		}
+	}
+	*data &= ~PORT_MII_SEL_M;
+	*data |= xmii;
+}
+
+static phy_interface_t ksz9477_get_interface(struct ksz_device *dev, int port)
+{
+	phy_interface_t interface;
+	bool gbit;
+	int mode;
+	u8 data8;
+
+	if (port < dev->phy_port_cnt)
+		return PHY_INTERFACE_MODE_NA;
+	ksz_pread8(dev, port, REG_PORT_XMII_CTRL_1, &data8);
+	gbit = ksz9477_get_gbit(dev, data8);
+	mode = ksz9477_get_xmii(dev, data8);
+	switch (mode) {
+	case 2:
+		interface = PHY_INTERFACE_MODE_GMII;
+		if (gbit)
+			break;
+	case 0:
+		interface = PHY_INTERFACE_MODE_MII;
+		break;
+	case 1:
+		interface = PHY_INTERFACE_MODE_RMII;
+		break;
+	default:
+		interface = PHY_INTERFACE_MODE_RGMII;
+		if (data8 & PORT_RGMII_ID_EG_ENABLE)
+			interface = PHY_INTERFACE_MODE_RGMII_TXID;
+		if (data8 & PORT_RGMII_ID_IG_ENABLE) {
+			interface = PHY_INTERFACE_MODE_RGMII_RXID;
+			if (data8 & PORT_RGMII_ID_EG_ENABLE)
+				interface = PHY_INTERFACE_MODE_RGMII_ID;
+		}
+		break;
 	}
+	return interface;
 }
 
 static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
@@ -1051,24 +1210,25 @@ static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 
 		/* configure MAC to 1G & RGMII mode */
 		ksz_pread8(dev, port, REG_PORT_XMII_CTRL_1, &data8);
-		data8 &= ~PORT_MII_NOT_1GBIT;
-		data8 &= ~PORT_MII_SEL_M;
 		switch (dev->interface) {
 		case PHY_INTERFACE_MODE_MII:
-			data8 |= PORT_MII_NOT_1GBIT;
-			data8 |= PORT_MII_SEL;
+			ksz9477_set_xmii(dev, 0, &data8);
+			ksz9477_set_gbit(dev, false, &data8);
 			p->phydev.speed = SPEED_100;
 			break;
 		case PHY_INTERFACE_MODE_RMII:
-			data8 |= PORT_MII_NOT_1GBIT;
-			data8 |= PORT_RMII_SEL;
+			ksz9477_set_xmii(dev, 1, &data8);
+			ksz9477_set_gbit(dev, false, &data8);
 			p->phydev.speed = SPEED_100;
 			break;
 		case PHY_INTERFACE_MODE_GMII:
-			data8 |= PORT_GMII_SEL;
+			ksz9477_set_xmii(dev, 2, &data8);
+			ksz9477_set_gbit(dev, true, &data8);
 			p->phydev.speed = SPEED_1000;
 			break;
 		default:
+			ksz9477_set_xmii(dev, 3, &data8);
+			ksz9477_set_gbit(dev, true, &data8);
 			data8 &= ~PORT_RGMII_ID_IG_ENABLE;
 			data8 &= ~PORT_RGMII_ID_EG_ENABLE;
 			if (dev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
@@ -1077,7 +1237,6 @@ static void ksz9477_port_setup(struct ksz_device *dev, int port, bool cpu_port)
 			if (dev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
 			    dev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
 				data8 |= PORT_RGMII_ID_EG_ENABLE;
-			data8 |= PORT_RGMII_SEL;
 			p->phydev.speed = SPEED_1000;
 			break;
 		}
@@ -1115,10 +1274,25 @@ static void ksz9477_config_cpu_port(struct dsa_switch *ds)
 
 	for (i = 0; i < dev->port_cnt; i++) {
 		if (dsa_is_cpu_port(ds, i) && (dev->cpu_ports & (1 << i))) {
+			phy_interface_t interface;
+
 			dev->cpu_port = i;
 			dev->host_mask = (1 << dev->cpu_port);
 			dev->port_mask |= dev->host_mask;
 
+			/* Read from XMII register to determine host port
+			 * interface.  If set specifically in device tree
+			 * note the difference to help debugging.
+			 */
+			interface = ksz9477_get_interface(dev, i);
+			if (!dev->interface)
+				dev->interface = interface;
+			if (interface && interface != dev->interface)
+				dev_info(dev->dev,
+					 "use %s instead of %s\n",
+					  phy_modes(dev->interface),
+					  phy_modes(interface));
+
 			/* enable cpu port */
 			ksz9477_port_setup(dev, i, true);
 			p = &dev->ports[dev->cpu_port];
@@ -1172,6 +1346,9 @@ static int ksz9477_setup(struct dsa_switch *ds)
 	ksz9477_cfg32(dev, REG_SW_QM_CTRL__4, UNICAST_VLAN_BOUNDARY,
 		      true);
 
+	/* Do not work correctly with tail tagging. */
+	ksz_cfg(dev, REG_SW_MAC_CTRL_0, SW_CHECK_LENGTH, false);
+
 	/* accept packet up to 2000bytes */
 	ksz_cfg(dev, REG_SW_MAC_CTRL_1, SW_LEGAL_PACKET_DISABLE, true);
 
@@ -1230,6 +1407,8 @@ static u32 ksz9477_get_port_addr(int port, int offset)
 static int ksz9477_switch_detect(struct ksz_device *dev)
 {
 	u8 data8;
+	u8 id_hi;
+	u8 id_lo;
 	u32 id32;
 	int ret;
 
@@ -1247,11 +1426,40 @@ static int ksz9477_switch_detect(struct ksz_device *dev)
 	ret = ksz_read32(dev, REG_CHIP_ID0__1, &id32);
 	if (ret)
 		return ret;
+	ret = ksz_read8(dev, REG_GLOBAL_OPTIONS, &data8);
+	if (ret)
+		return ret;
 
 	/* Number of ports can be reduced depending on chip. */
 	dev->mib_port_cnt = TOTAL_PORT_NUM;
 	dev->phy_port_cnt = 5;
 
+	/* Default capability is gigabit capable. */
+	dev->features = GBIT_SUPPORT;
+
+	id_hi = (u8)(id32 >> 16);
+	id_lo = (u8)(id32 >> 8);
+	if ((id_lo & 0xf) == 3) {
+		/* Chip is from KSZ9893 design. */
+		dev->features |= IS_9893;
+
+		/* Chip does not support gigabit. */
+		if (data8 & SW_QW_ABLE)
+			dev->features &= ~GBIT_SUPPORT;
+		dev->mib_port_cnt = 3;
+		dev->phy_port_cnt = 2;
+	} else {
+		/* Chip uses new XMII register definitions. */
+		dev->features |= NEW_XMII;
+
+		/* Chip does not support gigabit. */
+		if (!(data8 & SW_GIGABIT_ABLE))
+			dev->features &= ~GBIT_SUPPORT;
+	}
+
+	/* Change chip id to known ones so it can be matched against them. */
+	id32 = (id_hi << 16) | (id_lo << 8);
+
 	dev->chip_id = id32;
 
 	return 0;
@@ -1286,6 +1494,15 @@ struct ksz_chip_data {
 		.cpu_ports = 0x7F,	/* can be configured as cpu port */
 		.port_cnt = 7,		/* total physical port count */
 	},
+	{
+		.chip_id = 0x00989300,
+		.dev_name = "KSZ9893",
+		.num_vlans = 4096,
+		.num_alus = 4096,
+		.num_statics = 16,
+		.cpu_ports = 0x07,	/* can be configured as cpu port */
+		.port_cnt = 3,		/* total port count */
+	},
 };
 
 static int ksz9477_switch_init(struct ksz_device *dev)
@@ -1333,7 +1550,6 @@ static int ksz9477_switch_init(struct ksz_device *dev)
 		if (!dev->ports[i].mib.counters)
 			return -ENOMEM;
 	}
-	dev->interface = PHY_INTERFACE_MODE_RGMII_TXID;
 
 	return 0;
 }
diff --git a/drivers/net/dsa/microchip/ksz9477_spi.c b/drivers/net/dsa/microchip/ksz9477_spi.c
index d757ba1..7517862 100644
--- a/drivers/net/dsa/microchip/ksz9477_spi.c
+++ b/drivers/net/dsa/microchip/ksz9477_spi.c
@@ -2,7 +2,7 @@
 /*
  * Microchip KSZ9477 series register access through SPI
  *
- * Copyright (C) 2017-2018 Microchip Technology Inc.
+ * Copyright (C) 2017-2019 Microchip Technology Inc.
  */
 
 #include <asm/unaligned.h>
@@ -155,6 +155,8 @@ static void ksz9477_spi_shutdown(struct spi_device *spi)
 static const struct of_device_id ksz9477_dt_ids[] = {
 	{ .compatible = "microchip,ksz9477" },
 	{ .compatible = "microchip,ksz9897" },
+	{ .compatible = "microchip,ksz9893" },
+	{ .compatible = "microchip,ksz9563" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 9328b88..39dace8 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -453,7 +453,9 @@ int ksz_switch_register(struct ksz_device *dev,
 	if (ret)
 		return ret;
 
-	dev->interface = PHY_INTERFACE_MODE_MII;
+	/* Host port interface will be self detected, or specifically set in
+	 * device tree.
+	 */
 	if (dev->dev->of_node) {
 		ret = of_get_phy_mode(dev->dev->of_node);
 		if (ret >= 0)
-- 
1.9.1

Re: [PATCH v1 net-next 3/3] net: dsa: microchip: add KSZ9893 switch support

[Florian Fainelli]

On 2/28/2019 7:57 PM, Tristram.Ha@microchip.com wrote:
> From: Tristram Ha <Tristram.Ha@microchip.com>
> 
> Add KSZ9893 switch support in KSZ9477 driver.  This switch is similar to
> KSZ9477 except the ingress tail tag has 1 byte instead of 2 bytes, so
> KSZ9893 tagging will be used.
> 
> The XMII register that governs how the host port communicates with the
> MAC also has different register definitions.

Looks good, just one question below.

> 
> Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
> ---

[snip]

>  static int ksz9477_phy_read16(struct dsa_switch *ds, int addr, int reg)
> @@ -389,6 +399,10 @@ static int ksz9477_phy_write16(struct dsa_switch *ds, int addr, int reg,
>  	/* No real PHY after this. */
>  	if (addr >= dev->phy_port_cnt)
>  		return 0;
> +
> +	/* No gigabit support.  Do not write to this register. */
> +	if (!(dev->features & GBIT_SUPPORT) && reg == MII_CTRL1000)
> +		return 0;

There should not be any reasons to write to this register if the
linkmode capabilities are correctly reflected which you do take care of,
did you find PHYLIB writing to that register?
-- 
Florian

Re: [PATCH v1 net-next 2/3] net: dsa: add KSZ9893 switch tagging support

[Florian Fainelli]

On 2/28/2019 7:57 PM, Tristram.Ha@microchip.com wrote:
> From: Tristram Ha <Tristram.Ha@microchip.com>
> 
> KSZ9893 switch is similar to KSZ9477 switch except the ingress tail tag
> has 1 byte instead of 2 bytes.  The size of the portmap is smaller and
> so the override and lookup bits are also moved.
> 
> Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v1 net-next 1/3] dt-bindings: net: dsa: document additional Microchip KSZ9477 family switches

[Florian Fainelli]

On 2/28/2019 7:57 PM, Tristram.Ha@microchip.com wrote:
> From: Tristram Ha <Tristram.Ha@microchip.com>
> 
> Document additional Microchip KSZ9477 family switches.
> 
> Show how KSZ8565 switch should be configured as the host port is port 7
> instead of port 5.

OK, so port 7, if you start numbering the ports from 1, and port@6 to
match the hardware... a bit confusing, but I can work with that.

> 
> Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v1 net-next 0/3] net: dsa: microchip: add KSZ9893 switch support

[David Miller]

From: <Tristram.Ha@microchip.com>
Date: Thu, 28 Feb 2019 19:57:21 -0800

> From: Tristram Ha <Tristram.Ha@microchip.com>
> 
> This series of patches is to modify the KSZ9477 DSA driver to support
> running KSZ9893 switch.
> 
> The KSZ9893 switch is similar to KSZ9477 except the ingress tail tag has
> 1 byte instead of 2 bytes.  The XMII register that governs the MAC
> communication also has different register definitions.
> 
> v1
> - Put KSZ9893 tagging in separate patch
> - Remove other switch support

Series applied, please follow up with Florian about that register
write question on patch #3.

Thanks.

RE: [PATCH v1 net-next 3/3] net: dsa: microchip: add KSZ9893 switch support

[Tristram.Ha]

> >  static int ksz9477_phy_read16(struct dsa_switch *ds, int addr, int reg)
> > @@ -389,6 +399,10 @@ static int ksz9477_phy_write16(struct dsa_switch
> *ds, int addr, int reg,
> >  	/* No real PHY after this. */
> >  	if (addr >= dev->phy_port_cnt)
> >  		return 0;
> > +
> > +	/* No gigabit support.  Do not write to this register. */
> > +	if (!(dev->features & GBIT_SUPPORT) && reg == MII_CTRL1000)
> > +		return 0;
> 
> There should not be any reasons to write to this register if the
> linkmode capabilities are correctly reflected which you do take care of,
> did you find PHYLIB writing to that register?

I found the register is being written, although not trying to advertise gigabit speed.

Problem is the switch wants to have a 100Mbit variant but does not properly prepare the PHY for that.  From the outside the PHY looks like it is gigabit capable.  Internally gigabit support is completely removed.

Just to be safe the driver does not want to touch that register.