linux-kernel - Re: [PATCH 1/4] spi: Add option to wake a device by toggling CS

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Message-ID: <20160701082101.GD6247@sirena.org.uk>
Date:	Fri, 1 Jul 2016 09:21:01 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	apronin@...omium.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-spi@...r.kernel.org
Subject: Re: [PATCH 1/4] spi: Add option to wake a device by toggling CS

On Thu, Jun 30, 2016 at 09:23:26PM -0700, Doug Anderson wrote:

> Also, something doesn't seem terribly robust about this, buy maybe I'm
> being paranoid.  If something happens where the timer hasn't fired
> quickly enough then you might not know that you need to assert the
> wakeup, right?  I don't think there's a 100% guarantee that a timer
> will fire and finish running within a certain period of time, is
> there?

No, or at least a minimum bound on accuracy - you'd need to set the
timer for something lower than the actual limit.

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