linux-kernel - Re: [PATCH net] arm64: dts: imx8dxl: Disable hibernation mode of AR8031 for EQOS

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Date:   Thu, 15 Dec 2022 11:13:07 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     wei.fang@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, Frank.Li@....com, shenwei.wang@....com,
        xiaoning.wang@....com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] arm64: dts: imx8dxl: Disable hibernation mode of
 AR8031 for EQOS

On 15/12/2022 10:36, wei.fang@....com wrote:
> From: Wei Fang <wei.fang@....com>
> 
> The hibernation mode of AR8031 PHY defaults to be enabled after hardware
> reset. When the cable is unplugged, the PHY will enter hibernation mode
> after about 10 senconds and the PHY clocks will be stopped to save
> power. However, due to the design of EQOS, the mac needs the RX_CLK of
> PHY for software reset to complete. Otherwise the software reset of EQOS
> will be failed and do not work correctly. The only way is to disable
> hibernation mode of AR8031 PHY for EQOS, the "qca,disable-hibernation-mode"
> property is used for this purpose and has already been submitted to the
> upstream, for more details please refer to the below link:
> https://lore.kernel.org/netdev/20220818030054.1010660-2-wei.fang@nxp.com/

This is not a patch for net-next as you indicate in the subject. DTS
patches go via SoC platform maintainers.

Best regards,
Krzysztof