Re: [linux-next-v1 3/3] arm64: dts: rockchip: Fix ethernet reset node Rock 3A sbc

[Anand Moon <linux.amoon@xxxxxxxxx>]

Hi Peter / Michael

On Fri, 11 Nov 2022 at 18:32, Peter Geis <pgwipeout@xxxxxxxxx> wrote:
>
> On Fri, Nov 11, 2022 at 4:44 AM Anand Moon <linux.amoon@xxxxxxxxx> wrote:
> >
> > Add support for snps,reset-gpio reset ethernet gpio pins and
> > drop the mdio reset code.
>
> Nack, the snps,reset-gpio is depreciated in favor of the mdio-reset
> code. See [0].
>

Ok coming to the ethernet reset controller with gpio-reset with MDIO.
I got this working by adding ethernet-phy-id to MDIO.

> >
> > Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
> > ---
> >  .../boot/dts/rockchip/rk3568-rock-3a.dts      | 19 ++++++++-----------
> >  1 file changed, 8 insertions(+), 11 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > index 16fff1ada195..9172cf60b867 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts
> > @@ -258,6 +258,11 @@ &gmac1 {
> >         assigned-clocks = <&cru SCLK_GMAC1_RX_TX>, <&cru SCLK_GMAC1>;
> >         assigned-clock-parents = <&cru SCLK_GMAC1_RGMII_SPEED>, <&gmac1_clkin>;
> >         clock_in_out = "input";
> > +       snps,reset-gpio = <&gpio3 RK_PB0 GPIO_ACTIVE_LOW>;
> > +       snps,reset-active-low;
> > +       /* Reset time is 20ms, 100ms for rtl8211f */
> > +       snps,reset-delays-us = <0 20000 100000>;
> > +       phy-supply = <&vcc_3v3>;
>
> The phy supply shouldn't be part of this patch.
>

Ok will add this in a separate patch.

> >         phy-handle = <&rgmii_phy1>;
> >         phy-mode = "rgmii";
> >         pinctrl-names = "default";
> > @@ -267,6 +272,9 @@ &gmac1m1_rx_bus2
> >                      &gmac1m1_rgmii_clk
> >                      &gmac1m1_clkinout
> >                      &gmac1m1_rgmii_bus>;
> > +
> > +       tx_delay = <0x4f>;
> > +       rx_delay = <0x26>;
>
> Delays should move to your rgmii patch. Have you tested these to
> ensure they are in the middle of the functional range for this board?

Ok but this delay is different from the actual requirements see below.
rx-internal-delay-ps and tx-internal-delay-ps
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/net/ethernet-controller.yaml?h=v6.1-rc5#n222

tx_delay and rx_dealy are used by rockchip binding.

>
> >         status = "okay";
> >  };
> >
> > @@ -583,11 +591,6 @@ &mdio1 {
> >         rgmii_phy1: ethernet-phy@0 {
> >                 compatible = "ethernet-phy-ieee802.3-c22";
> >                 reg = <0x0>;
> > -               pinctrl-names = "default";
> > -               pinctrl-0 = <&eth_phy_rst>;
> > -               reset-assert-us = <20000>;
> > -               reset-deassert-us = <100000>;
> > -               reset-gpios = <&gpio3 RK_PB0 GPIO_ACTIVE_LOW>;
> >         };
> >  };
> >
> > @@ -625,12 +628,6 @@ vcc_mipi_en: vcc_mipi_en {
> >                 };
> >         };
> >
> > -       ethernet {
> > -               eth_phy_rst: eth_phy_rst {
> > -                       rockchip,pins = <3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
> > -               };
> > -       };
> > -
> >         hym8563 {
> >                 hym8563_int: hym8563-int {
> >                         rockchip,pins = <0 RK_PD3 RK_FUNC_GPIO &pcfg_pull_up>;
> > --
> > 2.38.1
> >
> [0] https://elixir.bootlin.com/linux/v6.1-rc4/source/Documentation/devicetree/bindings/net/snps,dwmac.yaml#L222
> >
Thanks





-Anand
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