linux-kernel - Re: [PATCH v2 0/4] Add drive-strength in Meson pinctrl driver

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Message-ID: <CAFBinCCgGbvN6nLywsGk3TXT7eDLD=2A=uD_W07QumyBJSCAuQ@mail.gmail.com>
Date:   Sat, 27 Apr 2019 21:46:50 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Guillaume La Roque <glaroque@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Add drive-strength in Meson pinctrl driver

Hi Linus,

On Tue, Apr 23, 2019 at 1:13 PM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Thu, Apr 18, 2019 at 2:48 PM Guillaume La Roque
> <glaroque@...libre.com> wrote:
>
> > The purpose of this patchset is to add drive-strength support in meson pinconf
> > driver. This is a new feature that was added on the g12a. It is critical for us
> > to support this since many functions are failing with default pad drive-strength.
> >
> > The value achievable by the SoC are 0.5mA, 2.5mA, 3mA and 4mA and the DT property
> > 'drive-strength' is expressed in mA.
> > So this patch add another generic property "drive-strength-uA". The change to do so
> > would be minimal and could be benefit to other platforms later on.
> >
> > Cheers
> > Guillaume
>
> This needs to be reviewed by Martin Blumenstigl, Martin can you have a look
> at this patch set? If you don't have the patches I think Guillaume can
> resend them.
thank you for the reminder - I just sent my feedback.
can you please also have a look at patch 4/4? there are two cases
where I'm not sure what the best practice of the pinctrl subsystem is


Regards
Martin