linux-kernel - Re: [PATCH] pinctrl: fix low level output voltage issue

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Message-ID: <CACRpkdYbVbgUEvGk4t2YHieUaFvMMg1EOR8opuCqm-w4wCYCOg@mail.gmail.com>
Date:   Fri, 4 Dec 2020 09:43:46 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Zhiyong Tao <zhiyong.tao@...iatek.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...nel.org>, srv_heupstream@...iatek.com,
        hui.liu@...iatek.com, huang eddie <eddie.huang@...iatek.com>,
        jg_poxu@...iatek.com, Biao Huang <biao.huang@...iatek.com>,
        Hongzhou Yang <hongzhou.yang@...iatek.com>,
        Erin Lo <erin.lo@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>, seiya.wang@...iatek.com,
        sj.huang@...iatek.com,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: fix low level output voltage issue

On Fri, Nov 20, 2020 at 10:31 AM Zhiyong Tao <zhiyong.tao@...iatek.com> wrote:

> This patch is used to fix low level output voltage issue.
> A pin is changed from input pull-up to output high.
> The Dout value of the pin is default as 0.
> If we change the direction of the pin before the dout value of the pin,
> It maybe produce a low level output voltage between "input pull-up" and
> "output high".
>
> Signed-off-by: Zhiyong Tao <zhiyong.tao@...iatek.com>

Patch applied!

Yours,
Linus Walleij