PA Semi PWRficient Gigabit Ethernet doesn't work anymore since the first networking updates for the kernel 4.16

[Christian Zigotzky]

Hello,

The PA Semi PWRficient Gigabit Ethernet doesn't work anymore since the 
first networking updates [1] for the kernel 4.16.

Error messages:

[    0.634241] libphy: pasemi gpio mdio bus: probed
[    0.634749] pasemi gpio mdio bus: Cannot register as MDIO bus, err -38
[    2.311496] pasemi_mac 0000:00:14.0: runtime IRQ mapping not provided 
by arch
[    2.311554] pasemi_mac 0000:00:14.1: runtime IRQ mapping not provided 
by arch
[    2.311599] pasemi_mac 0000:00:14.2: runtime IRQ mapping not provided 
by arch
[    2.311641] pasemi_mac 0000:00:14.3: runtime IRQ mapping not provided 
by arch
[    2.312276] pasemi_mac 0000:00:15.0: runtime IRQ mapping not provided 
by arch
[    2.312903] pasemi_mac 0000:00:15.1: runtime IRQ mapping not provided 
by arch
[    3.817420] i2c-pasemi 0000:00:1c.0: runtime IRQ mapping not provided 
by arch
[    3.817616] i2c-pasemi 0000:00:1c.1: runtime IRQ mapping not provided 
by arch
[    3.817809] i2c-pasemi 0000:00:1c.2: runtime IRQ mapping not provided 
by arch
[    4.299984] pasemi_edac 0000:00:04.0: runtime IRQ mapping not 
provided by arch
[    4.300281] pasemi_edac 0000:00:05.0: runtime IRQ mapping not 
provided by arch
[   39.633565] pasemi_mac 0000:00:14.3: PHY init failed: -19.
[   39.633569] pasemi_mac 0000:00:14.3: Defaulting to 1Gbit full duplex

I figured out that the problematic code is in the mdio bus changes of 
the networking updates. [1]

I found the problematic code in the file 'drivers/net/phy/mdio_bus.c'. I 
created a patch which solves the problem with the PA Semi PWRficient 
Gigabit Ethernet. (attached)

Could you please check the changes in the file 'drivers/net/phy/mdio_bus.c'?

Thanks,
Christian

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b2fe5fa68642860e7de76167c3111623aa0d5de1
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