linux-kernel - Re: [PATCH v2 0/2] ARM: dts: rockchip: pull up cts lines

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Date:	Thu, 03 Sep 2015 21:03:15 +0200
From:	Heiko Stuebner <heiko@...ech.de>
To:	Alexandru M Stan <amstan@...omium.org>
Cc:	Romain Perier <romain.perier@...il.com>,
	FUKAUMI Naoki <naobsd@...il.com>,
	Neil Hendin <nhendin@...omium.org>,
	Douglas Anderson <dianders@...omium.org>,
	Jeffy Chen <jeffy.chen@...k-chips.com>,
	Caesar Wang <wxt@...k-chips.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/2] ARM: dts: rockchip: pull up cts lines

Hi Alex,

Am Mittwoch, 2. September 2015, 16:27:57 schrieb Alexandru M Stan:
> 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.
> 
> The only boards affected (that care about uart*_cts ) are the veyron
> chromeos devices and the firefly. Veyron already has something like that,
> which I now have to remove in the second patch. Firefly uses uart0_cts
> for the wifi chip communications, same thing as veyron, so it should be
> fine having it.

applied both to my dts branch for 4.4 with Doug's Review-tag
(Currently only on github and becomes really public after 4.3-rc1)


Heiko
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