linux-kernel - Re: [Linux-stm32] [PATCH 5/8] ARM: dts: stm32: introduce stm32h7-pinctrl.dtsi to support stm32h75x

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Date:   Thu, 11 Mar 2021 21:03:04 +0800
From:   dillon min <dillon.minfei@...il.com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Alexandre TORGUE <alexandre.torgue@...s.st.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux@...linux.org.uk, Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        afzal.mohd.ma@...il.com, linux-stm32@...md-mailman.stormreply.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linux-stm32] [PATCH 5/8] ARM: dts: stm32: introduce
 stm32h7-pinctrl.dtsi to support stm32h75x

Hi Ahmad,

Thanks for discussing.

On Thu, Mar 11, 2021 at 8:55 PM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:
>
> Hello Dillon,
>
> On 11.03.21 13:23, dillon min wrote:
> > For stm32h7's new board support , I guess following the stm32f7/stm32f4's style
> > is a reasonable way to do it, but add a little optimization。
> > which means :
> > old structure
> > stm32h7-pinctrl.dtsi --> stm32h743-pinctrl.dtsi  (referenced by
> > stm32h743i-disco, -eval)
> >                                 |--> stm32h750-pinctrl.dtsi
> > (referenced by stm32h750i-art-pi, etc)
> > add art-pi other board's pin definition in stm32h750-pinctrl.dtsi with
> > xxx_pins_a, xxx_pins_b
> > xxx_pins_a used for art-pi, xxx_pins_b used for other boards.
> >
> > after more boards add in support, there will be more xxx_pin_c, .... defined
> >
> > as the pin map is according to the hardware schematic diagram io connection.
> > so, why not move xxx_pin_x to a board specific place. such as
> > stm32h750i-art-pi.dts
> >
> > new structure:
> > 1, rename stm32h743-pinctrl.dtsi to stm32h7-pinctrl.dtsi (only
> > preserve gpioa...k,)
> > 2, move xxx_pins_x from stm32h7-pinctrl.dtsi to
> > stm32h7xx-disco/eval/art-pi/etc.dts (as they depends on hardware
> > schematic)
> >
> > stm32h7-pinctrl.dtsi --> stm32h743i-discon.dts
> >                                 |--> stm32h743i-eval.dts
> >                                 |--> stm32h750i-art-pi.dts
> >                                 |--> stm32h7xxx.dts
> > would you agree this ?
>
> If the optimization you intend is reducing DTB size, you can flag
> all pinctrl groups with /omit-if-no-ref/ to have dtc throw them
> away if they are unused.
Thanks for your advice, actually, DTB size is not my first consideration.
different board pin configuration place to one dtsi files, it's a little hard
to maintain when a lot of boards add in.

>
> (But in general, I am in favor of having board-specific configuration
>  in the board dts)
Yes, same to me.
>
> Cheers,
> Ahmad
>
> --
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