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: <CANAwSgT7rasp=QYdvukAO-y6NzsOfKsjdy0jAEubvMymmfDqWA@mail.gmail.com>
Date:   Thu, 17 Nov 2022 20:25:47 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Peter Geis <pgwipeout@...il.com>, 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 Robin

On Thu, 17 Nov 2022 at 16:24, Robin Murphy <robin.murphy@....com> wrote:
>
> On 2022-11-17 05:57, Anand Moon wrote:
> > 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.
>
> Note that the Rock 3A schematic says the phy is configured for address
> 1, not 0. From what I remember of adding the MDIO node for NanoiPi4,
> that didn't work if I got the address wrong, despite the fact that the
> auto-detection when the MDIO node is omitted claimed to find the same
> phy on both addresses 0 and 1.
>

Yes, I have tested with these changes still this does not work, with
out this fix as of now..

We can check this comment in the below commit id
70f04e9a3358404367030493dc36718d4495a9a5  ARM: dts: imx6ul-14x14-evk:
Enable the GPIO expander

maybe something is still missing to be configured.

Thanks
-Anand

> Robin.
>
> >
> > Thanks
> > -Anand
> >>> --
> >>> 2.38.1
> >>>
> >
> > _______________________________________________
> > Linux-rockchip mailing list
> > Linux-rockchip@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip

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