On Sun, 18 Oct 2020 at 22:32, Ilias Apalodimas <ilias.apalodi...@linaro.org> wrote: > > On Sun, Oct 18, 2020 at 07:52:18PM +0200, Andrew Lunn wrote: > > > --- a/Documentation/devicetree/bindings/net/socionext-netsec.txt > > > +++ b/Documentation/devicetree/bindings/net/socionext-netsec.txt > > > @@ -30,7 +30,9 @@ Optional properties: (See ethernet.txt file in the same > > > directory) > > > - max-frame-size: See ethernet.txt in the same directory. > > > > > > The MAC address will be determined using the optional properties > > > -defined in ethernet.txt. > > > +defined in ethernet.txt. The 'phy-mode' property is required, but may > > > +be set to the empty string if the PHY configuration is programmed by > > > +the firmware or set by hardware straps, and needs to be preserved. > > > > In general, phy-mode is not mandatory. of_get_phy_mode() does the > > right thing if it is not found, it sets &priv->phy_interface to > > PHY_INTERFACE_MODE_NA, but returns -ENODEV. Also, it does not break > > backwards compatibility to convert a mandatory property to > > optional. So you could just do > > > > of_get_phy_mode(pdev->dev.of_node, &priv->phy_interface); > > > > skip all the error checking, and document it as optional. > > Why ? > The patch as is will not affect systems built on any firmware implementations > that use ACPI and somehow configure the hardware. > Although the only firmware implementations I am aware of on upsteream are > based > on EDK2, I prefer the explicit error as is now, in case a firmware does on > initialize the PHY properly (and is using a DT). >
We will also lose the ability to report bogus values for phy-mode this way, so I think we should stick with the check.
