linux-kernel - Re: [PATCH 1/2] dt-bindings: pinctrl: Add DT bindings for apple,pinctrl

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Date:   Sun, 9 May 2021 18:50:22 +0900
From:   Tomasz Figa <tomasz.figa@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Mark Kettenis <mark.kettenis@...all.nl>, kettenis@...nbsd.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Hector Martin <marcan@...can.st>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        sven@...npeter.dev
Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: Add DT bindings for apple,pinctrl

2021年5月9日(日) 9:27 Linus Walleij <linus.walleij@...aro.org>:
>
> On Sun, May 9, 2021 at 1:02 AM Mark Kettenis <mark.kettenis@...all.nl> wrote:
> > [Me]
> > > On Sat, May 8, 2021 at 4:20 PM Mark Kettenis <kettenis@...nbsd.org> wrote:
>
> > My U-Boot driver is here:
>
> Thanks! Looks nice.
>
> > > > +description: |
> > > > +  The Apple GPIO controller is a simple combined pin and GPIO controller
> > >
> > > spelling
> >
> > Not sure I'm seeing a spelling mistake here.  Do you want a comma
> > inserted somewhere?
>
> Your original mail says "conroller" but the helpful google mail
> editor autocorrected the mistake when I hit enter after it.
>
> > > So is this an entirely Apple thing now, and not based on some Samsung
> > > block from S3C like what we have seen before?
> >
> > As far as I can tell, yes.  This Apple controller has a single
> > register per pin that controls the muxing and gpio functions, whereas
> > the S3C controller seems to have 4 registers per pin.
>
> Fair enough.
>

Right, doesn't sound like any Samsung pin controller I'm familiar
with, although I haven't followed new hardware developments since I
left Samsung a few years ago. I've stayed as a maintainer mostly to
help with the legacy SoCs I had worked with, e.g. s3c6410. :)

Best regards,
Tomasz