linux-kernel - Re: Dropping device tree pinmux nodes for GPIO usage (Was: [PATCH 3/5] arm64: dts: sun50i: add MMC nodes)

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Date:   Tue, 17 Jan 2017 09:33:51 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Rask Ingemann Lambertsen <rask@...melder.dk>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Hans De Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Icenowy Zheng <icenowy@...c.xyz>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Dropping device tree pinmux nodes for GPIO usage (Was: [PATCH
 3/5] arm64: dts: sun50i: add MMC nodes)

On Sun, Jan 15, 2017 at 04:59:32PM +0100, Rask Ingemann Lambertsen wrote:
> On Tue, Jan 03, 2017 at 10:52:12AM +0800, Chen-Yu Tsai wrote:
> > On Tue, Jan 3, 2017 at 7:03 AM, Andre Przywara <andre.przywara@....com> wrote:
> > > +
> > > +                       mmc0_default_cd_pin: mmc0_cd_pin@0 {
> > > +                               pins = "PF6";
> > > +                               function = "gpio_in";
> > > +                               bias-pull-up;
> > > +                       };
> > 
> > We are starting to drop pinmux nodes for gpio usage.
> 
> How do we get the equivalent of bias-pull-up/down and drive-strength if we
> run across a pin that needs it?

Hmm, that's actually a very good question...

For those cases, leave the pinctrl node for now, we'll deal with that
in due time

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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