net: dsa: microchip: add KSZ9896 switch support

Add support for the KSZ9896 6-port Gigabit Ethernet Switch to the
ksz9477 driver.

Although the KSZ9896 is already listed in the device tree binding
documentation since a1c0ed24 (dt-bindings: net: dsa: document
additional Microchip KSZ9477 family switches) the chip id
(0x00989600) is not recognized by ksz_switch_detect() and rejected
by the driver.

The KSZ9896 is similar to KSZ9897 but has only one configurable
MII/RMII/RGMII/GMII cpu port.
Signed-off-by: NRomain Naour <romain.naour@skf.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/ksz_common.c

@@ -966,6 +966,35 @@ const struct ksz_chip_data ksz_switch_chips[] = {
 		.rd_table = &ksz9477_register_set,
 	},
 
+	[KSZ9896] = {
+		.chip_id = KSZ9896_CHIP_ID,
+		.dev_name = "KSZ9896",
+		.num_vlans = 4096,
+		.num_alus = 4096,
+		.num_statics = 16,
+		.cpu_ports = 0x3F,	/* can be configured as cpu port */
+		.port_cnt = 6,		/* total physical port count */
+		.ops = &ksz9477_dev_ops,
+		.phy_errata_9477 = true,
+		.mib_names = ksz9477_mib_names,
+		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),
+		.reg_mib_cnt = MIB_COUNTER_NUM,
+		.regs = ksz9477_regs,
+		.masks = ksz9477_masks,
+		.shifts = ksz9477_shifts,
+		.xmii_ctrl0 = ksz9477_xmii_ctrl0,
+		.xmii_ctrl1 = ksz9477_xmii_ctrl1,
+		.supports_mii	= {false, false, false, false,
+				   false, true},
+		.supports_rmii	= {false, false, false, false,
+				   false, true},
+		.supports_rgmii = {false, false, false, false,
+				   false, true},
+		.internal_phy	= {true, true, true, true,
+				   true, false},
+		.gbit_capable	= {true, true, true, true, true, true},
+	},
+
 	[KSZ9897] = {
 		.chip_id = KSZ9897_CHIP_ID,
 		.dev_name = "KSZ9897",
@@ -1807,6 +1836,7 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds,
 		proto = DSA_TAG_PROTO_KSZ9893;
 
 	if (dev->chip_id == KSZ9477_CHIP_ID ||
+	    dev->chip_id == KSZ9896_CHIP_ID ||
 	    dev->chip_id == KSZ9897_CHIP_ID ||
 	    dev->chip_id == KSZ9567_CHIP_ID)
 		proto = DSA_TAG_PROTO_KSZ9477;
@@ -2168,6 +2198,7 @@ static int ksz_switch_detect(struct ksz_device *dev)
 
 		switch (id32) {
 		case KSZ9477_CHIP_ID:
+		case KSZ9896_CHIP_ID:
 		case KSZ9897_CHIP_ID:
 		case KSZ9567_CHIP_ID:
 		case LAN9370_CHIP_ID:

drivers/net/dsa/microchip/ksz_common.h

@@ -147,6 +147,7 @@ enum ksz_model {
 	KSZ8765,
 	KSZ8830,
 	KSZ9477,
+	KSZ9896,
 	KSZ9897,
 	KSZ9893,
 	KSZ9567,
@@ -164,6 +165,7 @@ enum ksz_chip_id {
 	KSZ8765_CHIP_ID = 0x8765,
 	KSZ8830_CHIP_ID = 0x8830,
 	KSZ9477_CHIP_ID = 0x00947700,
+	KSZ9896_CHIP_ID = 0x00989600,
 	KSZ9897_CHIP_ID = 0x00989700,
 	KSZ9893_CHIP_ID = 0x00989300,
 	KSZ9567_CHIP_ID = 0x00956700,

drivers/net/dsa/microchip/ksz_spi.c

@@ -151,6 +151,10 @@ static const struct of_device_id ksz_dt_ids[] = {
 		.compatible = "microchip,ksz9477",
 		.data = &ksz_switch_chips[KSZ9477]
 	},
+	{
+		.compatible = "microchip,ksz9896",
+		.data = &ksz_switch_chips[KSZ9896]
+	},
 	{
 		.compatible = "microchip,ksz9897",
 		.data = &ksz_switch_chips[KSZ9897]
@@ -202,6 +206,7 @@ static const struct spi_device_id ksz_spi_ids[] = {
 	{ "ksz8863" },
 	{ "ksz8873" },
 	{ "ksz9477" },
+	{ "ksz9896" },
 	{ "ksz9897" },
 	{ "ksz9893" },
 	{ "ksz9563" },
@@ -231,6 +236,7 @@ static struct spi_driver ksz_spi_driver = {
 module_spi_driver(ksz_spi_driver);
 
 MODULE_ALIAS("spi:ksz9477");
+MODULE_ALIAS("spi:ksz9896");
 MODULE_ALIAS("spi:ksz9897");
 MODULE_ALIAS("spi:ksz9893");
 MODULE_ALIAS("spi:ksz9563");