net: dsa: add support for ksz9897 ethernet switch

ksz9477 is superset of ksz9xx series, driver just works
out of the box for ksz9897 chip with this patch.
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/dsa/ksz.txt

@@ -4,7 +4,9 @@ Microchip KSZ Series Ethernet switches
 Required properties:
 
 - compatible: For external switch chips, compatible string must be exactly one
-  of: "microchip,ksz9477"
+  of the following:
+  - "microchip,ksz9477"
+  - "microchip,ksz9897"
 
 See Documentation/devicetree/bindings/net/dsa/dsa.txt for a list of additional
 required and optional properties.

drivers/net/dsa/microchip/ksz_common.c

@@ -1102,6 +1102,15 @@ static const struct ksz_chip_data ksz_switch_chips[] = {
 		.cpu_ports = 0x7F,	/* can be configured as cpu port */
 		.port_cnt = 7,		/* total physical port count */
 	},
+	{
+		.chip_id = 0x00989700,
+		.dev_name = "KSZ9897",
+		.num_vlans = 4096,
+		.num_alus = 4096,
+		.num_statics = 16,
+		.cpu_ports = 0x7F,	/* can be configured as cpu port */
+		.port_cnt = 7,		/* total physical port count */
+	},
 };
 
 static int ksz_switch_init(struct ksz_device *dev)

drivers/net/dsa/microchip/ksz_spi.c

@@ -195,6 +195,7 @@ static int ksz_spi_remove(struct spi_device *spi)
 
 static const struct of_device_id ksz_dt_ids[] = {
 	{ .compatible = "microchip,ksz9477" },
+	{ .compatible = "microchip,ksz9897" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ksz_dt_ids);