Re: [PATCH net-next 7/7] net: dsa: mediatek: support EN751221 switch

[Jakub Kicinski <kuba@kernel.org>]

On Wed,  9 Sep 2026 14:03:46 +0000 Caleb James DeLisle wrote:
> The EcoNet EN751221 has either one, or two, onboard MT7530 switches.
> Every implementation of this SoC has one switch on die with the CPU,
> but some chips - notably those with a "G" in the name, have a second
> MT7530 as an MCM module.
> 
> The on-die MT7530 has 4 FE ports and 1 GE port. The MCM switch has all
> gigabit ports.
> 
> The MCM switch connects to the SoC switch via a TRGMII link from port
> 5 on the SoC switch to port 6 on the MCM switch. This link undergoes
> calibration on startup.
> 
> All known devices with the MCM present do not make any use of the ports
> on the on-die switch, it is put into "passthrough" mode in which all
> traffic is shuttled between port 6 and port 5 without alteration of the
> DSA tags.
> 
> Add support for both the on-die and the MCM switch, and calibration of
> the TRGMII link between them.

../drivers/net/dsa/mt7530.c: In function ‘en751221_trgmii_pair_setup’:
../drivers/net/dsa/mt7530.c:593:12: warning: variable ‘default_taps_ondie’ set but not used [-Wunused-but-set-variable=]
  593 |         u8 default_taps_ondie[NUM_TRGMII_CTRL];
      |            ^~~~~~~~~~~~~~~~~~
-- 
pw-bot: cr