linux-kernel - Re: [linux-next-v2 5/5] arm64: dts: rockchip: Add missing of ethernet-phy-id to reset the phy on Rock 3A SBC

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Message-ID: <CANAwSgQJGH-+aXyUF18kGks4YKfBYvQ4-B7S2m8eaAr=yNS7vQ@mail.gmail.com>
Date:   Thu, 17 Nov 2022 11:27:24 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Peter Geis <pgwipeout@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Chukun Pan <amadeus@....edu.cn>,
        Michael Riesch <michael.riesch@...fvision.net>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-next-v2 5/5] arm64: dts: rockchip: Add missing of
 ethernet-phy-id to reset the phy on Rock 3A SBC

Hi Peter,

On Thu, 17 Nov 2022 at 02:16, Peter Geis <pgwipeout@...il.com> wrote:
>
> On Wed, Nov 16, 2022 at 3:02 PM Anand Moon <linux.amoon@...il.com> wrote:
> >
> > Add MDIO description with ethernet-phy-id compatible string
> > which enable calling reset of the phy. The PHY will then be probed,
> > independent of if it can be found on the bus or not,
> > and that probing will enable the GPIO.
> >
> > ethernet-phy-id is read from ethenet register dump reg2 and reg3.
> >
> > Fix following warning.
> > [   12.323417] rk_gmac-dwmac fe010000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
> > [   12.324078] rk_gmac-dwmac fe010000.ethernet eth0: no phy at addr -1
> > [   12.324099] rk_gmac-dwmac fe010000.ethernet eth0: __stmmac_open: Cannot attach to PHY (error: -19)
> >
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > V2: new to the patch series.
> >
> > alarm@...k-3a:~$ sudo ethtool -d eth0
> > [sudo] password for alarm:
> > ST GMAC Registers
> > GMAC Registers
> > Reg0  0x08072203
> > Reg1  0x00000000
> > Reg2  0x00000404
> > Reg3  0x00000000
> > Reg4  0x00000002
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > index 9f84a23a8789..fe36156a5017 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > @@ -585,7 +585,7 @@ &i2s2_2ch {
> >
> >  &mdio1 {
> >         rgmii_phy1: ethernet-phy@0 {
> > -               compatible = "ethernet-phy-ieee802.3-c22";
> > +               compatible = "ethernet-phy-id0000.0404", "ethernet-phy-ieee802.3-c22";
> >                 reg = <0x0>;
> >                 pinctrl-names = "default";
> >                 pinctrl-0 = <&eth_phy_rst>, <&eth_phy_int>;
>
> Have you tried instead moving the reset to the mdio bus? I've had
> success with this, though you'll need to change the reset assert and
> deassert timing handles, they are different for the bus.
>
No can you share some examples?
If you got a better way to solve this issue please let me know.
I will give this a try.

Thanks
-Anand
> > --
> > 2.38.1
> >