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

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Message-ID: <CAOMZO5DfuU5dGALFOmryn=xpRq+wWfpQjZEhBje9JAQ8jkXPjw@mail.gmail.com>
Date:   Wed, 22 Jul 2020 18:49:08 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Chris Healy <cphealy@...il.com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Stefan Agner <stefan@...er.ch>,
        Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: dts: ZII: Disable HW Ethernet switch reset GPIOs

Hi Chris,

On Wed, Jul 22, 2020 at 5:33 PM Chris Healy <cphealy@...il.com> 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>
> ---
> v2:
> - Update the description to more accurately reflect why we are making the change

Updated description is clear now:

Reviewed-by: Fabio Estevam <festevam@...il.com>