linux-kernel - Re: [linux-sunxi] [PATCH 2/4] ARM: dts: sun8i: Add PWM channel 0 pinmux setting for A23/A33

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Message-ID: <20150918193313.GU4684@lukather>
Date:	Fri, 18 Sep 2015 21:33:13 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Hans de Goede <hdegoede@...hat.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 2/4] ARM: dts: sun8i: Add PWM channel 0
 pinmux setting for A23/A33

On Sat, Sep 19, 2015 at 12:18:04AM +0800, Chen-Yu Tsai wrote:
> On Fri, Sep 18, 2015 at 11:30 PM, Hans de Goede <hdegoede@...hat.com> wrote:
> > Hi,
> >
> > On 09/18/2015 03:35 AM, Chen-Yu Tsai wrote:
> >>
> >> The PWM controller has 2 outputs, with one usable pin for each.
> >>
> >> Add a pinmux setting for the first channel. This is often used
> >> for backlight dimming on tablets.
> >>
> >> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> >> ---
> >>   arch/arm/boot/dts/sun8i-a23-a33.dtsi | 7 +++++++
> >>   1 file changed, 7 insertions(+)
> >>
> >> diff --git a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> >> b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> >> index e7054304018a..8f4db82084c5 100644
> >> --- a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> >> +++ b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> >> @@ -412,6 +412,13 @@
> >>                                 allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> >>                         };
> >>
> >> +                       pwm0_pins: pwm0 {
> >
> >
> > This should be "pwm0_pins_a: pwm0@0" so as to be consistent with the a10 /
> > a20 dtsi
> > files.
> 
> This is the only possible setting. I do not see why we need "_a" for the
> label and "@0" for the name. IMHO they are used to avoid name clashes when
> there are multiple possible pinmux settings.

Yep, sounds reasonable, I applied the patch.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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