linux-kernel - stmmac regression on ASUS TinkerBoard

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Message-ID: <8fa9ce79-6aa2-d44d-e24d-09cc1b2b70a3@katsuster.net>
Date:   Sun, 23 Jun 2019 23:14:55 +0900
From:   Katsuhiro Suzuki <katsuhiro@...suster.net>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>, Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: stmmac regression on ASUS TinkerBoard

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@...90000' node)

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

-----
root@...aro-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