linux-kernel - Re: [PATCH 4/4] arm: dts: zynq: Replace 'io-standard' with 'power-source' property

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Date:   Fri, 30 Jul 2021 14:43:57 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        git <git@...inx.com>, saikrishna12468@...il.com
Subject: Re: [PATCH 4/4] arm: dts: zynq: Replace 'io-standard' with
 'power-source' property

On Thu, Jul 29, 2021 at 9:59 PM Rob Herring <robh@...nel.org> wrote:
> On Wed, Jul 21, 2021 at 05:22:33PM +0530, Sai Krishna Potthuri wrote:
> > Replace 'io-standard' property with 'power-source' property in all zynq dts
> > files to be in sync with Zynq pinctrl driver.
> >
> > Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> > ---
> >  arch/arm/boot/dts/zynq-ebaz4205.dts |  8 ++++----
> >  arch/arm/boot/dts/zynq-microzed.dts |  2 +-
> >  arch/arm/boot/dts/zynq-zc702.dts    | 20 ++++++++++----------
> >  arch/arm/boot/dts/zynq-zc706.dts    | 18 +++++++++---------
> >  4 files changed, 24 insertions(+), 24 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/zynq-ebaz4205.dts b/arch/arm/boot/dts/zynq-ebaz4205.dts
> > index b0b836aedd76..be7eae611fb7 100644
> > --- a/arch/arm/boot/dts/zynq-ebaz4205.dts
> > +++ b/arch/arm/boot/dts/zynq-ebaz4205.dts
> > @@ -57,7 +57,7 @@
> >
> >               conf {
> >                       groups = "gpio0_20_grp", "gpio0_32_grp";
> > -                     io-standard = <3>;
> > +                     power-source = <3>;
>
> This will break using a new DT with a kernel without patch 3.

The old (Linux) kernel never supported the "io-standard" property
anyway.

Unless someone is running som BSD or Windows with support for
this property it can be merged by the quality of zero real-world
impacts (no-one there to hear the tree fall in the forest).

Sai Krishna: correct?

Yours,
Linus Walleij