net: dsa: mt7530: explain exposing MDIO bus of MT7531AE better

Unlike MT7531BE, the GPIO 6-12 pins are not used for RGMII on MT7531AE.
Therefore, the GPIO 11-12 pins are set to function as MDC and MDIO to
expose the MDIO bus of the switch. Replace the comment with a better
explanation.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 1f6cd24de4b73da68a7762838395c8747788bb9e..2b9f904a98f0b3b5100aa679d8ec4eadef4bfc60 100644 (file)
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2635,7 +2635,10 @@ mt7531_setup(struct dsa_switch *ds)
        if (!priv->p5_sgmii) {
                mt7531_pll_setup(priv);
        } else {
-               /* Let ds->user_mii_bus be able to access external phy. */
+               /* Unlike MT7531BE, the GPIO 6-12 pins are not used for RGMII on
+                * MT7531AE. Set the GPIO 11-12 pins to function as MDC and MDIO
+                * to expose the MDIO bus of the switch.
+                */
                mt7530_rmw(priv, MT7531_GPIO_MODE1, MT7531_GPIO11_RG_RXD2_MASK,
                           MT7531_EXT_P_MDC_11);
                mt7530_rmw(priv, MT7531_GPIO_MODE1, MT7531_GPIO12_RG_RXD3_MASK,