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

Peter Geis
2022-11-16T20:46:39Z

On Wed, Nov 16, 2022 at 3:02 PM Anand Moon <linux.amoon@gmail.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@gmail.com>
> ---
> V2: new to the patch series.
>
> alarm@rock-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.

> --
> 2.38.1
>