On Tue, 18 Aug 2020 15:14:10 +0800 Landen Chao wrote:

Add new support for MT7531:

MT7531 is the next generation of MT7530. It is also a 7-ports switch with
5 giga embedded phys, 2 cpu ports, and the same MAC logic of MT7530. Cpu
port 6 only supports SGMII interface. Cpu port 5 supports either RGMII
or SGMII in different HW sku. Due to SGMII interface support, pll, and
pad setting are different from MT7530. This patch adds different initial
setting, and SGMII phylink handlers of MT7531.

MT7531 SGMII interface can be configured in following mode:
- 'SGMII AN mode' with in-band negotiation capability
    which is compatible with PHY_INTERFACE_MODE_SGMII.
- 'SGMII force mode' without in-bnad negotiation
    which is compatible with 10B/8B encoding of
    PHY_INTERFACE_MODE_1000BASEX with fixed full-duplex and fixed pause.
- 2.5 times faster clocked 'SGMII force mode' without in-bnad negotiation
    which is compatible with 10B/8B encoding of
    PHY_INTERFACE_MODE_2500BASEX with fixed full-duplex and fixed pause.

Signed-off-by: Landen Chao <redacted>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>

Please fix these W=1 warnings:

../drivers/net/dsa/mt7530.c:1976:1: warning: no previous prototype for ‘mt7531_sgmii_link_up_force’ [-Wmissing-prototypes]
 1976 | mt7531_sgmii_link_up_force(struct dsa_switch *ds, int port,
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/dsa/mt7530.c:2081:6: warning: no previous prototype for ‘mt7531_sgmii_restart_an’ [-Wmissing-prototypes]
 2081 | void mt7531_sgmii_restart_an(struct dsa_switch *ds, int port)
      |      ^~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/dsa/mt7530.c:1976:1: warning: symbol 'mt7531_sgmii_link_up_force' was not declared. Should it be static?
../drivers/net/dsa/mt7530.c:2081:6: warning: symbol 'mt7531_sgmii_restart_an' was not declared. Should it be static?