On Thu, Sep 01, 2016 at 10:06:12PM +0900, Milo Kim wrote:
> On 09/01/2016 01:20 AM, Maxime Ripard wrote:
> >Hi Milo,
> >
> >On Wed, Aug 31, 2016 at 05:25:17PM +0900, Milo Kim wrote:
> >>H3 PA5 pin is assigned for single PWM channel.
> >>
> >>Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> >>Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
> >>Cc: Chen-Yu Tsai <wens@xxxxxxxx>
> >>Cc: devicetree@xxxxxxxxxxxxxxx
> >>Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> >>Cc: linux-kernel@xxxxxxxxxxxxxxx
> >>Signed-off-by: Milo Kim <woogyom.kim@xxxxxxxxx>
> >>---
> >> arch/arm/boot/dts/sun8i-h3.dtsi | 7 +++++++
> >> 1 file changed, 7 insertions(+)
> >>
> >>diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
> >>index fdf9fdb..05d0c4b 100644
> >>--- a/arch/arm/boot/dts/sun8i-h3.dtsi
> >>+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
> >>@@ -360,6 +360,13 @@
> >> allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> >> };
> >>
> >>+ pwm0_pin_a: pwm0@0 {
> >>+ allwinner,pins = "PA5";
> >>+ allwinner,function = "pwm0";
> >>+ allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> >>+ allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> >>+ };
> >>+
> >
> >Is it used on any boards?
> >
> >If not, we have the policy of not merging the pinctrl nodes that are
> >not used by anyone to avoid bloating the DT for no particular reason.
>
> Yes, I have. It's Nano Pi M1 which was derived from Orange Pi PC.
> The board DTS is ready to be sent out, but I'm not sure which is better.
>
> a) Send new board DTS file in other patch thread
>
> [PATCH v3 0/4] Add PWM feature in Allwinner H3
> [PATCH v3 1/4] ARM: dts: sun8i: Add PWM pin in H3
> ..
> [PATCH v3 4/4] pwm: sunxi: Add H3 support
>
> [PATCH] ARM: dts: sun8i: Add Nano Pi M1 support
>
> Or
>
> b) Include the DTS in next patch-set v3
> [PATCH v3 0/4] Add PWM feature in Allwinner H3
> [PATCH v3 1/4] ARM: dts: sun8i: Add PWM pin in H3
> [PATCH v3 2/4] ARM: dts: sun8i: Add PWM controller node in H3
> [PATCH v3 3/4] ARM: dts: sun8i: Add Nano Pi M1 support
> ...
Generally speaking, I'd prefer:
[PATCH v3 1/2] pwm: sunxi: Add H3 support
[PATCH v3 2/2] ARM: dts: sun8i: Add PWM controller node in H3
(It's usually better to add support for something and then add it)
And then
[PATCH v1 1/2] ARM: dts: sun8i: Add PWM pin in H3
[PATCH v1 2/2] ARM: dts: sun8i: Add Nano Pi M1 support
However, judging from the board documentation, that pin is labelled as
PWM1/GPIOA6, which means that they don't enforce any usage on that pin
(as opposed to the pin 3 and 5 for example, which are forced to i2c0).
In such a case, we also don't enforce anything, since any user should
be able to use it for whatever he or she wants.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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