linux-kernel - Re: [PATCH v2 1/2] ARM: dts: rockchip: pull up cts lines on rk3288

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Date:	Wed, 2 Sep 2015 16:34:38 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Alexandru M Stan <amstan@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Romain Perier <romain.perier@...il.com>,
	FUKAUMI Naoki <naobsd@...il.com>,
	Neil Hendin <nhendin@...omium.org>,
	Jeffy Chen <jeffy.chen@...k-chips.com>,
	Caesar Wang <wxt@...k-chips.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/2] ARM: dts: rockchip: pull up cts lines on rk3288

Alex,

On Wed, Sep 2, 2015 at 4:27 PM, Alexandru M Stan <amstan@...omium.org> wrote:
> The flow control lines from a user accessible UART are optional,
> the user might not have anything connected to those pins.
> In order to prevent random interrupts happening and noise affecting
> the cts pin should be pulled up.
>
> Note that the default state for that pin on the rk3288 is pulled up,
> so this patch merely restores them.
>
> This is similar to what we're already doing with the RX pin,
> so it should be safe. At worst it might be a slightly higher power usage
> (through ~50 kohms) when the cts is low.
>
> Suggested-by: Neil Hendin <nhendin@...omium.org>
> Signed-off-by: Alexandru M Stan <amstan@...omium.org>
> ---
> Changes in v2: None

Probably not entirely true.  ;)

>  arch/arm/boot/dts/rk3288.dtsi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Looks good to me.

Reviewed-by: Douglas Anderson <dianders@...omium.org>
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