linux-kernel - Re: [PATCH v2] ARM: dts: ZII: Disable HW Ethernet switch reset GPIOs

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Date:   Mon, 17 Aug 2020 21:29:04 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Chris Healy <cphealy@...il.com>
Cc:     s.hauer@...gutronix.de, stefan@...er.ch, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, festevam@...il.com
Subject: Re: [PATCH v2] ARM: dts: ZII: Disable HW Ethernet switch reset GPIOs

On Wed, Jul 22, 2020 at 01:33:41PM -0700, Chris Healy wrote:
> From: Chris Healy <cphealy@...il.com>
> 
> Disable Ethernet switch reset GPIO with ZII platforms that have it
> enabled.  HW switch reset results in a reset of the copper PHYs
> inside of the switch.  We want to avoid this reset of the copper PHYs
> in the switch as this results in unnecessary broader network disruption on
> a soft reboot of the application processor.
> 
> With the HW GPIO removed, the switch driver still performs a soft reset of
> the switch core which has been shown to sufficiently meet our needs with
> other ZII platforms that do not have the HW switch reset GPIO defined. 
> 
> Signed-off-by: Chris Healy <cphealy@...il.com>

Applied, thanks.