stmmac regression on ASUS TinkerBoard

stmmac regression on ASUS TinkerBoard

[Katsuhiro Suzuki]

Hello stmmac maintainers,

I found this commit and that has some regressions:
   74371272f97f net: stmmac: Convert to phylink and remove phylib logic


My environment is:
   - ASUS TinkerBoard
   - SoC is RK3288
   - Using STMMAC driver
     drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
   - Using this device-tree
     arch/arm/boot/dts/rk3288.dtsi ('gmac: ethernet@ff290000' node)

Current linux-next on my environment, 'ifconfig eth0 up' does not work
correctly with following message...

-----
root@linaro-alip:~# ifconfig eth0 up
[  105.028916] rk_gmac-dwmac ff290000.ethernet eth0: stmmac_open: Cannot 
attach to PHY (error: -19)
SIOCSIFFLAGS: No such device
-----

I checked drivers/net/ethernet/stmicro/stmmac/stmmac_main.c and found
stmmac_init_phy() is going to fail if ethernet device node does not
have following property:
   - phy-handle
   - phy
   - phy-device

This commit broke the device-trees such as TinkerBoard. The mdio
subnode creating a mdio bus is changed to required or still optional?


Best Regards,
Katsuhiro Suzuki

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RE: stmmac regression on ASUS TinkerBoard

[Jose Abreu]

From: Katsuhiro Suzuki <katsuhiro@katsuster.net>

> I checked drivers/net/ethernet/stmicro/stmmac/stmmac_main.c and found
> stmmac_init_phy() is going to fail if ethernet device node does not
> have following property:
>    - phy-handle
>    - phy
>    - phy-device
> 
> This commit broke the device-trees such as TinkerBoard. The mdio
> subnode creating a mdio bus is changed to required or still optional?

Yeah, with PHYLINK the PHY binding is always required ...

How do you want to proceed ? I think DT bindings can never break between 
releases so I will probably need to cook a patch for stmmac.

Thanks,
Jose Miguel Abreu
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Re: stmmac regression on ASUS TinkerBoard

[Heiko Stübner]

Hi,

Am Dienstag, 25. Juni 2019, 09:46:12 CEST schrieb Jose Abreu:
> From: Katsuhiro Suzuki <katsuhiro@katsuster.net>
> 
> > I checked drivers/net/ethernet/stmicro/stmmac/stmmac_main.c and found
> > stmmac_init_phy() is going to fail if ethernet device node does not
> > have following property:
> >    - phy-handle
> >    - phy
> >    - phy-device
> > 
> > This commit broke the device-trees such as TinkerBoard. The mdio
> > subnode creating a mdio bus is changed to required or still optional?
> 
> Yeah, with PHYLINK the PHY binding is always required ...
> 
> How do you want to proceed ? I think DT bindings can never break between 
> releases so I will probably need to cook a patch for stmmac.

Correct ... old devicetrees on new kernels should not break.
Especially as this affects a big number of boards potentially loosing
network support and in the devicetree binding the phy property is also
marked as optional.

Heiko



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