linux-kernel - Re: [PATCH] arm64: dts: stratix10: Change pad skew values for EMAC0 PHY driver

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Message-ID: <cb89395b-b3cc-c9f1-26d4-419803c93b86@kernel.org>
Date:   Tue, 24 Apr 2018 10:13:50 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     "Ooi, Joyce" <joyce.ooi@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        See Chin Liang <chin.liang.see@...el.com>,
        Yves Vandervennet <yves.vandervennet@...el.com>,
        Ong Hean Loong <hean.loong.ong@...el.com>
Subject: Re: [PATCH] arm64: dts: stratix10: Change pad skew values for EMAC0
 PHY driver



On 04/23/2018 10:01 PM, Ooi, Joyce wrote:
> The HPS EMAC0 drive strength is changed to 4mA because the initial 8mA
> drive strength has caused CE test to fail. This requires changes on the
> pad skew for EMAC0 PHY driver. Based on several measurements done, Tx
> clock does not require the extra 0.96ns delay.
> 
> Signed-off-by: Ooi, Joyce <joyce.ooi@...el.com>
> ---
>  .../boot/dts/altera/socfpga_stratix10_socdk.dts    |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> index 0007564..8785f78 100644
> --- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> +++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> @@ -79,7 +79,7 @@
>  			rxd2-skew-ps = <420>; /* 0ps */
>  			rxd3-skew-ps = <420>; /* 0ps */
>  			txen-skew-ps = <0>; /* -420ps */
> -			txc-skew-ps = <1860>; /* 960ps */
> +			txc-skew-ps = <900>; /* 0ps */
>  			rxdv-skew-ps = <420>; /* 0ps */
>  			rxc-skew-ps = <1680>; /* 780ps */
>  		};
> 

Applied, thanks!

Dinh