The driver sets up the switch during probe making external and internal ports available to use. It does not support direct I/O through these switch ports in this version and I'm not sure that is a feature useful in U-Boot. Instead ENETC ethernet interfaces that are internally linked to the switch can be used after the switch is set up.
This is where the RFC part comes in. Both the switch as a device and its ports are probed as ethernet devices. That's handy as accessors to connect to the PHY can be used but otherwise they are useful as the user can't ping to these interfaces. I'd like to get some feedback on whether this is acceptable or instead I should use some other structure for describing the switch and its ports, maybe have a new DM uclass. Other switch devices are registered as PHYs but that's not too useful if the external ports of the switch have PHYs of their own and they need to be driven too.
Using a complete DTS the switch looks like this:
=> dm tree Class Index Probed Driver Name ----------------------------------------------------------- .... pci 2 [ + ] pci_generic_ecam |-- pcie@1f0000000 eth 1 [ + ] enetc_eth | |-- enetc-0 eth 2 [ + ] enetc_eth | |-- enetc-1 eth 3 [ + ] enetc_eth | |-- enetc-2 mdio 5 [ + ] enetc_mdio | |-- emdio-3 pci_generi 0 [ ] pci_generic_drv | |-- pci_3:0.4 eth 4 [ + ] felix_ethsw | |-- felix_ethsw eth 6 [ + ] felix-port | | |-- port@0 eth 7 [ + ] felix-port | | |-- port@1 eth 8 [ + ] felix-port | | |-- port@2 eth 9 [ + ] felix-port | | |-- port@3 eth 10 [ + ] felix-port | | |-- port@4 eth 11 [ + ] felix-port | | `-- port@5 eth 5 [ + ] enetc_eth | |-- enetc-6 pci_generi 1 [ ] pci_generic_drv | `-- pci_3:1f.0
=> mdio list felix_ethsw: emdio-3: mdio@50: 0 - Aquantia AQR412 <--> port@0 1 - Aquantia AQR412 <--> port@1 2 - Aquantia AQR412 <--> port@2 3 - Aquantia AQR412 <--> port@3 mdio@00: 5 - AR8035 <--> enetc-1 mdio@40: 2 - Aquantia AQR112 <--> enetc-0 mdio@60: mdio@70:
Any feedback is welcome, of course :)
Thank you! Alex
Depends on https://patchwork.ozlabs.org/project/uboot/list/?series=123813
Changes in v2: - added empty _stop function for switch ports, stop is not optional, - added switch port PHYs in RDB board DT - cosmetic fixes
Alex Marginean (2): drivers: net: Add a driver for the Felix Ethernet switch on NXP LS1028A arm: dts: ls1028a: add node for the integrated Ethernet switch
arch/arm/dts/fsl-ls1028a-rdb.dts | 36 +++ arch/arm/dts/fsl-ls1028a.dtsi | 31 +++ drivers/net/Kconfig | 7 + drivers/net/Makefile | 1 + drivers/net/fsl_enetc.h | 5 + drivers/net/fsl_felix.c | 420 +++++++++++++++++++++++++++++++ 6 files changed, 500 insertions(+) create mode 100644 drivers/net/fsl_felix.c