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

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Date:   Tue, 9 Nov 2021 21:29:22 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Emil Renner Berthing <kernel@...il.dk>
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, 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.

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? 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