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

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Date:	Sat, 19 Sep 2015 00:18:04 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.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 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.


Regards
ChenYu

> Regards,
>
> Hans
>
>
>> +                               allwinner,pins = "PH0";
>> +                               allwinner,function = "pwm0";
>> +                               allwinner,drive = <SUN4I_PINCTRL_10_MA>;
>> +                               allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
>> +                       };
>> +
>>                         i2c0_pins_a: i2c0@0 {
>>                                 allwinner,pins = "PH2", "PH3";
>>                                 allwinner,function = "i2c0";
>>
>
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