linux-kernel - Re: [PATCH v3 12/16] pinctrl: starfive: Add pinctrl driver for StarFive SoCs

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Date:   Tue, 9 Nov 2021 22:04:24 +0100
From:   Emil Renner Berthing <kernel@...il.dk>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Drew Fustini <drew@...gleboard.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michael Zhu <michael.zhu@...rfivetech.com>,
        Fu Wei <tekkamanninja@...il.com>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Matteo Croce <mcroce@...rosoft.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Huan Feng <huan.feng@...rfivetech.com>
Subject: Re: [PATCH v3 12/16] pinctrl: starfive: Add pinctrl driver for
 StarFive SoCs

On Tue, 9 Nov 2021 at 21:29, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Tue, Nov 9, 2021 at 10:40 AM Emil Renner Berthing <kernel@...il.dk> wrote:
> > On Tue, 9 Nov 2021 at 10:34, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
>
> > > > The order the different states are blinked depends entirely on
> > > > how the pinctrl framework parses the device tree. I still think it
> > > > would be more natural to cleanly go to the end result without this
> > > > blinking.
> >
> > Hmm.. but if going through the different states is what you want, then
> > wouldn't you need the device tree to have an ordered list of the
> > states rather than just a single node and also a way to tune how long
> > time the different states are blinked?
>
> In a way you are correct that the DT is a functional language and it's
> a bit lite a style sheet or prolog or something in that the end reduction
> is what counts.
>
> In this case, I would say something is weird if there are interim states,
> the yaml validation should not allow you to set the same thing back
> and forth in your DTS file.

Yes, exactly.

> Alas we are not perfect as in yaml validation isn't perfect either.
> I can't see what the problem is really, just write proper DTS files
> and there will not be any interim states, right?

No, I agree. I think it's only that Andy wasn't sure if these interim
states might be meaningful/useful.

> And if it is possible
> to write DTS files that have states and sequence requirements,
> these should be caught in validation. Should be.
>
> Yours,
> Linus Walleij