RE: [PATCH 4/4] arm64: dts: imx8ulp-evk: enable fec

[Joakim Zhang]

Hi Peng,

> -----Original Message-----
> From: Peng Fan <peng.fan@xxxxxxx>
> Sent: 2021年11月22日 9:04
> To: Andrew Lunn <andrew@xxxxxxx>; Peng Fan (OSS)
> <peng.fan@xxxxxxxxxxx>
> Cc: robh+dt@xxxxxxxxxx; Aisheng Dong <aisheng.dong@xxxxxxx>; Joakim
> Zhang <qiangqing.zhang@xxxxxxx>; davem@xxxxxxxxxxxxx;
> kuba@xxxxxxxxxx; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; festevam@xxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>; netdev@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [PATCH 4/4] arm64: dts: imx8ulp-evk: enable fec
> 
> > Subject: Re: [PATCH 4/4] arm64: dts: imx8ulp-evk: enable fec
> >
> > > +&fec {
> > > +	pinctrl-names = "default";
> > > +	pinctrl-0 = <&pinctrl_enet>;
> > > +	phy-mode = "rmii";
> >
> > Is this really a Fast Ethernet? Not 1G?
> 
> Not 1G. it only support 10M/100M ethernet.
> 
> >
> > > +	phy-handle = <&ethphy>;
> > > +	status = "okay";
> > > +
> > > +	mdio {
> > > +		#address-cells = <1>;
> > > +		#size-cells = <0>;
> > > +
> > > +		ethphy: ethernet-phy {
> > > +			reg = <1>;
> >
> > I'm surprised this does not give warnings from the DTS tools. There is
> > a reg value, so it should be ethernet-phy@1
> 
> I not see warning per my build:
> "
> *** Default configuration is based on 'defconfig'
> #
> # No change to .config
> #
>   CALL    scripts/atomic/check-atomics.sh
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   DTC     arch/arm64/boot/dts/freescale/imx8ulp-evk.dtb
> "
> Anyway I will check and fix if the node needs a fix.

According to PHY guide, Documentation/devicetree/bindings/net/ethernet-phy.yaml, yes, we need write to ' ethernet-phy@1'.

DTS tool may not complain it, I guess 'make dtbs_check' could give a warning...

Best Regards,
Joakim Zhang
> Thanks,
> Peng
> 
> >
> >   Andrew