linux-kernel - Re: [PATCH] ARM: dts: stm32: lxa-mc1: Fix kernel warning about PHY delays

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Message-ID: <83fb8c55-7ea6-8212-9e67-30e24d14faa6@pengutronix.de>
Date:   Fri, 7 Aug 2020 17:24:15 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Holger Assmann <h.assmann@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
Cc:     devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH] ARM: dts: stm32: lxa-mc1: Fix kernel warning about PHY
 delays

On 8/7/20 5:03 PM, Holger Assmann wrote:
> The KSZ9031 PHY skew timings for rxc/txc, originally set to achieve
> the desired phase shift between clock- and data-signal, now trigger a
> kernel warning when used in rgmii-id mode:
> 
>  *-skew-ps values should be used only with phy-mode = "rgmii"
> 
> This is because commit bcf3440c6dd7 ("net: phy: micrel: add phy-mode
> support for the KSZ9031 PHY") now configures own timings when
> phy-mode = "rgmii-id". Device trees wanting to set their own delays
> should use phy-mode "rgmii" instead as the warning prescribes.
> 
> The "standard" timings now used with "rgmii-id" work fine on this
> board, so drop the explicit timings in the device tree and thereby
> silence the warning.
> 
> Fixes: 666b5ca85cd3 ("ARM: dts: stm32: add STM32MP1-based Linux Automation MC-1 board")
> Signed-off-by: Holger Assmann <h.assmann@...gutronix.de>

Acked-by: Ahmad Fatoum <a.fatoum@...gutronic.de>

> ---
>  arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> index 5700e6b700d3..b85025d00943 100644
> --- a/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> +++ b/arch/arm/boot/dts/stm32mp157c-lxa-mc1.dts
> @@ -121,8 +121,6 @@
>  			reset-gpios = <&gpiog 0 GPIO_ACTIVE_LOW>; /* ETH_RST# */
>  			interrupt-parent = <&gpioa>;
>  			interrupts = <6 IRQ_TYPE_EDGE_FALLING>; /* ETH_MDINT# */
> -			rxc-skew-ps = <1860>;
> -			txc-skew-ps = <1860>;
>  			reset-assert-us = <10000>;
>  			reset-deassert-us = <300>;
>  			micrel,force-master;
> 

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