linux-kernel - Re: [PATCH 1/2] pinctrl: mcp23s08: Add optional reset GPIO

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Message-ID: <CACRpkdbkjpV4DY+WMVdYX0136XxB9Z9bga-KbZ+D0oB+pQu_ww@mail.gmail.com>
Date:   Sat, 12 Jun 2021 01:59:05 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andreas Kaessens <akaessens@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-kernel@...cs.fau.de, Darian Biastoch <d.biastoch@...il.com>
Subject: Re: [PATCH 1/2] pinctrl: mcp23s08: Add optional reset GPIO

On Thu, Jun 10, 2021 at 3:24 PM Andreas Kaessens <akaessens@...il.com> wrote:

> The MCP23x port expander RESET# line can be connected to a host GPIO.
> The optional reset-gpio must be set to LOW if the reset is asserted
> at probing time.
>
> On page 5 in the datasheet [0] the "Device Active After Reset high"
> time is specified at 0 µs. Therefore no waiting is needed after the
> reset transition.
>
> [0] https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf
>
> Signed-off-by: Andreas Kaessens <akaessens@...il.com>
> Signed-off-by: Darian Biastoch <d.biastoch@...il.com>

Both patches applied, thanks!

Yours,
Linus Walleij