linux-kernel - Re: [PATCH v3 12/12] ARM: dtsi: axp81x: set pinmux for GPIO0/1 when used as LDOs

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Message-ID: <20171003091837.GK20805@n2100.armlinux.org.uk>
Date:   Tue, 3 Oct 2017 10:18:37 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v3 12/12] ARM: dtsi: axp81x: set pinmux for GPIO0/1 when
 used as LDOs

On Tue, Oct 03, 2017 at 10:06:29AM +0800, Chen-Yu Tsai wrote:
> On Tue, Oct 3, 2017 at 4:42 AM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > On Mon, Oct 02, 2017 at 12:08:54PM +0000, Quentin Schulz wrote:
> >> On AXP813/818, GPIO0 and GPIO1 can be used as LDO as (respectively)
> >> ldo_io0 and ldo_io1.
> >>
> >> Let's add the pinctrl properties to the said regulators.
> >>
> >> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> >> ---
> >>  arch/arm/boot/dts/axp81x.dtsi | 14 ++++++++++++++
> >>  1 file changed, 14 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/axp81x.dtsi b/arch/arm/boot/dts/axp81x.dtsi
> >> index f90f257130d5..099b0ddc1bbb 100644
> >> --- a/arch/arm/boot/dts/axp81x.dtsi
> >> +++ b/arch/arm/boot/dts/axp81x.dtsi
> >> @@ -52,6 +52,16 @@
> >>               compatible = "x-powers,axp813-gpio";
> >>               gpio-controller;
> >>               #gpio-cells = <2>;
> >> +
> >> +             gpio0_ldo: gpio0_ldo {
> >> +                     pins = "GPIO0";
> >> +                     function = "ldo";
> >> +             };
> >> +
> >> +             gpio1_ldo: gpio1_ldo {
> >> +                     pins = "GPIO1";
> >> +                     function = "ldo";
> >> +             };
> >
> > The node names are not supposed to contain any hyphens.
> 
> Hmm, I was under the impression that hyphens were preferred in
> node names, and a warning would be added to dtc later on.
> I might be wrong though.

I think there's a terminology issue here.

"-" is a hyphen or minus sign.
"_" is an underscore.

Underscores are not supposed to be used for node names, instead hyphens
are preferred.  I think Maxime means "underscore".

Here's the list from dtc/checks.c:

#define LOWERCASE       "abcdefghijklmnopqrstuvwxyz"
#define UPPERCASE       "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define DIGITS          "0123456789"
#define PROPNODECHARS   LOWERCASE UPPERCASE DIGITS ",._+*#?-"
#define PROPNODECHARSSTRICT     LOWERCASE UPPERCASE DIGITS ",-"

If strict mode is enabled, use of any of "._+#?" in the node name will
produce a warning.

-- 
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