[PATCH] ARC: [plat-hsdk]: Switch ethernet phy-mode to rgmii-id

[Vineet Gupta]

On 7/7/20 8:38 AM, Evgeniy Didin wrote:
> HSDK board has Micrel KSZ9031, recent commit
> bcf3440c6dd ("net: phy: micrel: add phy-mode support for the KSZ9031 PHY")
> caused a breakdown of Ethernet.
> Using 'phy-mode = "rgmii"' is not correct because accodring RGMII
> specification it is necessary to have delay on RX (PHY to MAX)
> which is not generated in case of "rgmii".
> Using "rgmii-id" adds necessary delay and solves the issue.
>
> Also adding name of PHY placed on HSDK board.
>
> Signed-off-by: Evgeniy Didin <Evgeniy.Didin at synopsys.com>
> Cc: Eugeniy Paltsev <Eugeniy.Paltsev at synopsys.com>
> Cc: Alexey Brodkin <abrodkin at synopsys.com>

@Alexey - u ok with this change ?

-Vineet

> ---
>  arch/arc/boot/dts/hsdk.dts | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
> index 9acbeba832c0..d6427d47e5a1 100644
> --- a/arch/arc/boot/dts/hsdk.dts
> +++ b/arch/arc/boot/dts/hsdk.dts
> @@ -208,7 +208,7 @@
>  			reg = <0x8000 0x2000>;
>  			interrupts = <10>;
>  			interrupt-names = "macirq";
> -			phy-mode = "rgmii";
> +			phy-mode = "rgmii-id";
>  			snps,pbl = <32>;
>  			snps,multicast-filter-bins = <256>;
>  			clocks = <&gmacclk>;
> @@ -226,7 +226,7 @@
>  				#address-cells = <1>;
>  				#size-cells = <0>;
>  				compatible = "snps,dwmac-mdio";
> -				phy0: ethernet-phy at 0 {
> +				phy0: ethernet-phy at 0 { /* Micrel KSZ9031 */
>  					reg = <0>;
>  				};
>  			};