Re: Re: [PATCH 4/5] ARM: dts: sunxi: add dtsi file for V3s SoC

Re: Re: [PATCH 4/5] ARM: dts: sunxi: add dtsi file for V3s SoC

[Icenowy Zheng]

2017年1月11日 02:21于 Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>写道：
>
> On Tue, Jan 03, 2017 at 11:16:28PM +0800, Icenowy Zheng wrote: 
> > + uart0_pins_a: uart0@0 { 
> > + pins = "PB8", "PB9"; 
> > + function = "uart0"; 
> > + bias-pull-up; 
>
> Why do you need a pullup here? 

I think TX needs one, but RX do not need.

>
> Looks good otherwise. 
>
> Thanks! 
> Maxime 
>
> -- 
> Maxime Ripard, Free Electrons 
> Embedded Linux and Kernel engineering 
> http://free-electrons.com 
>
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Re: Re: [PATCH 4/5] ARM: dts: sunxi: add dtsi file for V3s SoC

[Maxime Ripard]

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On Wed, Jan 11, 2017 at 11:56:32AM +0800, Icenowy Zheng wrote:
> 
> 2017年1月11日 02:21于 Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>写道：
> >
> > On Tue, Jan 03, 2017 at 11:16:28PM +0800, Icenowy Zheng wrote: 
> > > + uart0_pins_a: uart0@0 { 
> > > + pins = "PB8", "PB9"; 
> > > + function = "uart0"; 
> > > + bias-pull-up; 
> >
> > Why do you need a pullup here? 
> 
> I think TX needs one, but RX do not need.

That's (at best) board specific. So it belongs in the DTS if it's
truely needed.

Maxime

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

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