linux-kernel - Re: [PATCH] ARM: dts: document pinctrl-single,pins when #pinctrl-cells = 2

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Message-ID: <CA+7tXigg+h3v61AVMaYRKa_ZwznehOUPEESMqXKsNDNCrFph3w@mail.gmail.com>
Date:   Wed, 23 Sep 2020 22:49:11 -0700
From:   Trent Piepho <tpiepho@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Drew Fustini <drew@...gleboard.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        linux-gpio <linux-gpio@...r.kernel.org>,
        Christina Quast <cquast@...overdisplays.com>
Subject: Re: [PATCH] ARM: dts: document pinctrl-single,pins when
 #pinctrl-cells = 2

On Wed, Sep 23, 2020 at 10:43 PM Tony Lindgren <tony@...mide.com> wrote:
>
> * Trent Piepho <tpiepho@...il.com> [200924 01:34]:
> > On Tue, Sep 22, 2020 at 11:57 PM Tony Lindgren <tony@...mide.com> wrote:
> > >
> > > Also FYI, folks have also complained for a long time that the pinctrl-single
> > > binding mixes mux and conf values while they should be handled separately.
> > >
> >
> > Instead of combining two fields when the dts is generated they are now
> > combined when the pinctrl-single driver reads the dts.  Other than
> > this detail, the result is the same.  The board dts source is the
> > same.  The value programmed into the pinctrl register is the same.
> > There is no mechanism currently that can alter that value in any way.
> >
> > What does combining them later allow that is not possible now?
>
> It now allows further driver changes to manage conf and mux separately :)

The pinctrl-single driver?  How will that work with boards that are
not am335x and don't use conf and mux fields in the same manner as
am335x?