Messages in this thread | | | Date | Fri, 8 Sep 2017 16:17:36 +0200 | From | Andrew Lunn <> | Subject | Re: [PATCH v5 10/10] net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs |
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> > Do you know why the reset times out/fails? > > > > Because there are nothing connected to it.
That should not be an issue. A read should just return 0xffff. And it should return 0xffff fast. The timing of the MDIO protocol is fixed. A read or a write takes a fixed number of cycles, independent of if there is a device there or not. The bus data line has a pullup, so if you try to access a missing device, you automatically read 0xffff.
Andrew
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