+static int ar8xxx_set_pad_ctrl(struct dsa_switch *ds, int port, int mode)
+{
+	int reg;
+
+	switch (port) {
+	case 0:
+		reg = AR8327_REG_PORT0_PAD_CTRL;
+		break;
+	case 6:
+		reg = AR8327_REG_PORT6_PAD_CTRL;
+		break;
+	default:
+		pr_err("Can't set PAD_CTRL on port %d\n", port);
+		return -EINVAL;
+	}
+
+	/* DSA only supports 1 CPU port for now, so we'll take the assumption
+	 * that P0 is connected to the CPU master_dev.
+	 */

I don't like this assumption. Hardware i have with Marvell switches
has the CPU connected to ports 5, or 6, or 0.

Calling dsa_upstream_port() will tell you which is the CPU port.

	Andrew
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