linux-kernel - Re: [PATCH 4/5] arm64: dts: rockchip: fix gmac support for NanoPi R5S

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Date:   Thu, 16 Mar 2023 13:34:59 +0800
From:   Tianling Shen <cnsztl@...il.com>
To:     Vasily Khoruzhick <anarsoul@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Peter Geis <pgwipeout@...il.com>, Andy Yan <andyshrk@....com>,
        Brian Norris <briannorris@...omium.org>,
        Chris Morgan <macromorgan@...mail.com>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Andrew Lunn <andrew@...n.ch>,
        Michael Riesch <michael.riesch@...fvision.net>,
        Maya Matuszczyk <maccraft123mc@...il.com>,
        Andrew Powers-Holmes <aholmes@...om.net>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] arm64: dts: rockchip: fix gmac support for NanoPi R5S

Hi Vasily,

On Thu, Mar 16, 2023 at 8:16 AM Vasily Khoruzhick <anarsoul@...il.com> wrote:
>
> On Wed, Mar 15, 2023 at 9:02 AM Tianling Shen <cnsztl@...il.com> wrote:
> >
> > - Changed phy-mode to rgmii.
> >
> > - Fixed pull type in pinctrl for gmac0.
> >
> > - Removed duplicate properties in mdio node.
> >   These properties are defined in the gmac0 node already.
> >
> > Signed-off-by: Tianling Shen <cnsztl@...il.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts | 7 ++-----
> >  1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts b/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts
> > index e9adf5e66529..2a1118f15c29 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dts
> > @@ -57,7 +57,7 @@
> >         assigned-clock-rates = <0>, <125000000>;
> >         clock_in_out = "output";
> >         phy-handle = <&rgmii_phy0>;
> > -       phy-mode = "rgmii-id";
> > +       phy-mode = "rgmii";
> >         pinctrl-names = "default";
> >         pinctrl-0 = <&gmac0_miim
> >                      &gmac0_tx_bus2
> > @@ -79,9 +79,6 @@
> >                 reg = <1>;
> >                 pinctrl-0 = <&eth_phy0_reset_pin>;
> >                 pinctrl-names = "default";
> > -               reset-assert-us = <10000>;
> > -               reset-deassert-us = <50000>;
> > -               reset-gpios = <&gpio0 RK_PC4 GPIO_ACTIVE_LOW>;
>
> Hmm, I don't see RK_PC4 being used anywhere else. gmac0 has RK_PC5 as

Yes, it's a typo, it should be RK_RC5.

> snsp,reset-gpio. So it essentially drops reset for the PHY. Is it
> expected?

snsp,reset-gpio defined reset already, so we don't need to set it here again.

---

snsp,reset-gpio is the legacy binding, but I still have no idea why
reset-gpios doesn't work,
the dwmac driver will fail to lookup phy:

[   10.398514] rk_gmac-dwmac fe2a0000.ethernet eth0: no phy found
[   10.399061] rk_gmac-dwmac fe2a0000.ethernet eth0: __stmmac_open:
Cannot attach to PHY (error: -19)

Any ideas would be appreciated.

Thanks,
Tianling.

>
> >         };
> >  };
> >
> > @@ -115,7 +112,7 @@
> >  &pinctrl {
> >         gmac0 {
> >                 eth_phy0_reset_pin: eth-phy0-reset-pin {
> > -                       rockchip,pins = <0 RK_PC4 RK_FUNC_GPIO &pcfg_pull_down>;
> > +                       rockchip,pins = <0 RK_PC4 RK_FUNC_GPIO &pcfg_pull_up>;
> >                 };
> >         };
> >
> > --
> > 2.17.1
> >