linux-kernel - Re: [PATCH V2 1/3] arm64: dts: imx8mm: Correct WDOG

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Message-ID: <20201030103449.GR28755@dragon>
Date:   Fri, 30 Oct 2020 18:34:49 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     robh+dt@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, krzk@...nel.org, aford173@...il.com,
        daniel.baluta@....com, shengjiu.wang@....com, peter.chen@....com,
        alifer.wsdm@...il.com, abel.vesa@....com, yibin.gong@....com,
        jun.li@....com, l.stach@...gutronix.de, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH V2 1/3] arm64: dts: imx8mm: Correct WDOG_B pin
 configuration

On Mon, Oct 12, 2020 at 08:44:00PM +0800, Anson Huang wrote:
> Different revision of i.MX8MM EVK boards may have different external
> pull up registor design, some are enabled while some are NOT, to make
> sure the WDOG_B pin works properly, better to enable internal pull up
> resistor. Since enabling internal pull up resistor is NOT harmful and
> having benefit of flexibility on different board design, just enable
> it for all i.MX8MM boards; And schmitt input is NOT necessary for this
> WDOG_B output pin, so remove it; Open drain outputs provide more
> flexibility to a designer as they can be pulled-up to any voltage found
> in the system, so enable it as well.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Applied all, thanks.