net: dsa: mt7530: store port 5 SGMII capability of MT7531

Introduce the p5_sgmii field to store the information for whether port 5
has got SGMII or not. Instead of reading the MT7531_TOP_SIG_SR register
multiple times, the register will be read once and the value will be
stored on the p5_sgmii field. This saves unnecessary reads of the
register.

Move the comment about MT7531AE and MT7531BE to mt7531_setup(), where the
switch is identified.

Get rid of mt7531_dual_sgmii_supported() now that priv->p5_sgmii stores the
information. Address the code where mt7531_dual_sgmii_supported() is used.

Get rid of mt7531_is_rgmii_port() which just prints the opposite of
priv->p5_sgmii.

Instead of calling mt7531_pll_setup() then returning, do not call it if
port 5 is SGMII.

Remove P5_INTF_SEL_GMAC5_SGMII. The p5_interface_select enum is supposed to
represent the mode that port 5 is being used in, not the hardware
information of port 5. Set p5_intf_sel to P5_INTF_SEL_GMAC5 instead, if
port 5 is not dsa_is_unused_port().

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Acked-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20240122-for-netnext-mt7530-improvements-1-v3-3-042401f2b279@arinc9.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 9cbf18efa416..80060cc740d2 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -687,7 +687,6 @@ enum p5_interface_select {
 	P5_INTF_SEL_PHY_P0,
 	P5_INTF_SEL_PHY_P4,
 	P5_INTF_SEL_GMAC5,
-	P5_INTF_SEL_GMAC5_SGMII,
 };
 
 struct mt7530_priv;
@@ -756,6 +755,8 @@ struct mt753x_info {
  *			registers
  * @p6_interface	Holding the current port 6 interface
  * @p5_intf_sel:	Holding the current port 5 interface select
+ * @p5_sgmii:		Flag for distinguishing if port 5 of the MT7531 switch
+ *			has got SGMII
  * @irq:		IRQ number of the switch
  * @irq_domain:		IRQ domain of the switch irq_chip
  * @irq_enable:		IRQ enable bits, synced to SYS_INT_EN
@@ -777,6 +778,7 @@ struct mt7530_priv {
 	phy_interface_t		p6_interface;
 	phy_interface_t		p5_interface;
 	enum p5_interface_select p5_intf_sel;
+	bool			p5_sgmii;
 	u8			mirror_rx;
 	u8			mirror_tx;
 	struct mt7530_port	ports[MT7530_NUM_PORTS];
@@ -786,7 +788,7 @@ struct mt7530_priv {
 	int irq;
 	struct irq_domain *irq_domain;
 	u32 irq_enable;
-	int (*create_sgmii)(struct mt7530_priv *priv, bool dual_sgmii);
+	int (*create_sgmii)(struct mt7530_priv *priv);
 	u8 active_cpu_ports;
 };