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

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Message-ID: <20170112165244.js3qrgo2nbazycmn@lukather>
Date:   Thu, 12 Jan 2017 17:52:44 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     linux-clk@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>, linux-doc@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com,
        Chen-Yu Tsai <wens@...e.org>
Subject: Re: [linux-sunxi] Re: [PATCH 4/5] ARM: dts: sunxi: add dtsi file for
 V3s SoC

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@...e-electrons.com>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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