mfd: Support additional parent IDs for wm831x

Some newer device revisions add a second parent ID. Support this in
the device validity checks done at startup.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/wm831x-core.c

@@ -1455,7 +1455,11 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
 		dev_err(wm831x->dev, "Failed to read parent ID: %d\n", ret);
 		goto err;
 	}
-	if (ret != 0x6204) {
+	switch (ret) {
+	case 0x6204:
+	case 0x6246:
+		break;
+	default:
 		dev_err(wm831x->dev, "Device is not a WM831x: ID %x\n", ret);
 		ret = -EINVAL;
 		goto err;