Hi Florian,
On Sat, Sep 15, 2018 at 02:25:05PM -0700, Florian Fainelli wrote:
>
>
> On 09/14/18 01:16, Quentin Schulz wrote:
> > Previously, the SerDes muxing was hardcoded to a given mode in the MAC
> > controller driver. Now, the SerDes muxing is configured within the
> > Device Tree and is enforced in the MAC controller driver so we can have
> > a lot of different SerDes configurations.
> >
> > Make use of the SerDes PHYs in the MAC controller to set up the SerDes
> > according to the SerDes<->switch port mapping and the communication mode
> > with the Ethernet PHY.
>
> This looks good, just a few comments below:
>
> [snip]
>
> > + err = of_get_phy_mode(portnp);
> > + if (err < 0)
> > + ocelot->ports[port]->phy_mode = PHY_INTERFACE_MODE_NA;
> > + else
> > + ocelot->ports[port]->phy_mode = err;
> > +
> > + switch (ocelot->ports[port]->phy_mode) {
> > + case PHY_INTERFACE_MODE_NA:
> > + continue;
>
> Would not you want to issue a message indicating that the Device Tree
> must be updated here? AFAICT with your patch series, this should no
> longer be a condition that you will hit unless you kept the old DTB
> around, right?
>
It'll occur for internal PHYs. On the PCB123[1], there are four of them,
so we need to be able to give no mode in the DT for those. For the
upcoming PCB120, there'll be 4 external PHYs that require a mode in the
DT and 4 internal PHYs that do not require any mode. I could put a debug
message that says this or that PHY is configured as an internal PHY but
I wouldn't put a message that is printed with the default log level.
So I think we should keep it, shouldn't we?
[1] https://elixir.bootlin.com/linux/latest/source/arch/mips/boot/dts/mscc/ocelot_pcb123.dts
> > + case PHY_INTERFACE_MODE_SGMII:
> > + phy_mode = PHY_MODE_SGMII;
> > + break;
> > + case PHY_INTERFACE_MODE_QSGMII:
> > + phy_mode = PHY_MODE_QSGMII;
> > + break;
> > + default:
> > + dev_err(ocelot->dev,
> > + "invalid phy mode for port%d, (Q)SGMII only\n",
> > + port);
> > + return -EINVAL;
> > + }
> > +
> > + serdes = devm_of_phy_get(ocelot->dev, portnp, NULL);
> > + if (IS_ERR(serdes)) {
> > + err = PTR_ERR(serdes);
> > + if (err == -EPROBE_DEFER) {
>
> This can be simplified into:
>
> if (err == -EPROBE_DEFER)
> dev_dbg();
> else
> dev_err();
> goto err_probe_ports;
>
Indeed, good catch.
Thanks,
Quentin
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