linux-kernel - Re: [PATCH v5 10/10] arm: dts: genmai: Add ethernet pin group

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Message-ID: <CACRpkdaiDMxaGM=vqeqVQ-6i3ecYhc+pudy4yt4zAZW-XZ4vCw@mail.gmail.com>
Date:   Fri, 28 Apr 2017 10:49:32 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Chris Brandt <chris.brandt@...esas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 10/10] arm: dts: genmai: Add ethernet pin group

On Thu, Apr 27, 2017 at 10:19 AM, Jacopo Mondi
<jacopo+renesas@...ndi.org> wrote:

> Add pin configuration subnode for ETHER ethernet controller.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
(...)
> +               pins_bidir {
> +                       pinmux = <RZA1_PINMUX(3, 3, 2)>;/* P3_3 = ET_MDIO  */
> +                       bi-directional;
> +               };

So I'm against merging this until someone explains what "bi-directional"
actually means, electrically speaking. What happens physically on this pin?

I think this just means open drain.

It is dangerous to merge things we don't understand.

Surely someone inside Renesas can answer this question.

Yours,
Linus Walleij