net: dsa: bcm_sf2: Update compatible string for 7278B0

Update the compatible string and Device Tree binding document for
7278B0.

Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/devicetree/bindings/net/brcm,bcm7445-switch-v4.0.txt

···
 
 Required properties:
 
-- compatible: should be "brcm,bcm7445-switch-v4.0" or "brcm,bcm7278-switch-v4.0"
+- compatible: should be one of
+	"brcm,bcm7445-switch-v4.0"
+	"brcm,bcm7278-switch-v4.0"
+	"brcm,bcm7278-switch-v4.8"
 - reg: addresses and length of the register sets for the device, must be 6
   pairs of register addresses and lengths
 - interrupts: interrupts for the devices, must be two interrupts

drivers/net/dsa/bcm_sf2.c

···
 	{ .compatible = "brcm,bcm7278-switch-v4.0",
 	  .data = &bcm_sf2_7278_data
 	},
+	{ .compatible = "brcm,bcm7278-switch-v4.8",
+	  .data = &bcm_sf2_7278_data
+	},
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, bcm_sf2_of_match);