Instead of relying on hard-coded numbers for MII ports, introduce
a bitmap for MII ports.
This is done in order to prepare for supporting MaxLinear GSW1xx ICs
which got a different layout of ports.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
---
v4: no changes
v3: no changes
v2:
 - move comment before 'if' statement
 - don't add unused sgmii_ports and phy_ports
 - correct bitmask for XRX200 and XRX300 (they were swapped in v1/RFC)

 drivers/net/dsa/lantiq_gswip.c | 14 +++++++++++---
 drivers/net/dsa/lantiq_gswip.h |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index b1b250fc4f61..d988839dce2f 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -183,14 +183,20 @@ static void gswip_mii_mask(struct gswip_priv *priv, u32 clear, u32 set,
 static void gswip_mii_mask_cfg(struct gswip_priv *priv, u32 clear, u32 set,
 			       int port)
 {
-	/* There's no MII_CFG register for the CPU port */
-	if (!dsa_is_cpu_port(priv->ds, port))
-		gswip_mii_mask(priv, clear, set, GSWIP_MII_CFGp(port));
+	/* MII_CFG register only exists for MII ports */
+	if (!(priv->hw_info->mii_ports & BIT(port)))
+		return;
+
+	gswip_mii_mask(priv, clear, set, GSWIP_MII_CFGp(port));
 }
 
 static void gswip_mii_mask_pcdu(struct gswip_priv *priv, u32 clear, u32 set,
 				int port)
 {
+	/* MII_PCDU register only exists for MII ports */
+	if (!(priv->hw_info->mii_ports & BIT(port)))
+		return;
+
 	switch (port) {
 	case 0:
 		gswip_mii_mask(priv, clear, set, GSWIP_MII_PCDU0);
@@ -1993,12 +1999,14 @@ static void gswip_shutdown(struct platform_device *pdev)
 static const struct gswip_hw_info gswip_xrx200 = {
 	.max_ports = 7,
 	.allowed_cpu_ports = BIT(6),
+	.mii_ports = BIT(0) | BIT(1) | BIT(5),
 	.phylink_get_caps = gswip_xrx200_phylink_get_caps,
 };
 
 static const struct gswip_hw_info gswip_xrx300 = {
 	.max_ports = 7,
 	.allowed_cpu_ports = BIT(6),
+	.mii_ports = BIT(0) | BIT(5),
 	.phylink_get_caps = gswip_xrx300_phylink_get_caps,
 };
 
diff --git a/drivers/net/dsa/lantiq_gswip.h b/drivers/net/dsa/lantiq_gswip.h
index 8703c947028a..1bd05348f1e1 100644
--- a/drivers/net/dsa/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq_gswip.h
@@ -216,6 +216,7 @@
 struct gswip_hw_info {
 	int max_ports;
 	unsigned int allowed_cpu_ports;
+	unsigned int mii_ports;
 	void (*phylink_get_caps)(struct dsa_switch *ds, int port,
 				 struct phylink_config *config);
 };
-- 
2.50.1