linux-kernel - Re: [PATCH v2 4/4] mfd: dln2: add suspend/resume functionality

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Message-ID: <20150107102637.GD22905@localhost>
Date:	Wed, 7 Jan 2015 11:26:37 +0100
From:	Johan Hovold <johan@...nel.org>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	linus.walleij@...aro.org, lee.jones@...aro.org, johan@...nel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 4/4] mfd: dln2: add suspend/resume functionality

On Tue, Dec 16, 2014 at 05:57:15PM +0200, Octavian Purdila wrote:
> Without suspend/resume functionality in the USB driver the USB core
> will disconnect and reconnect the DLN2 port and because the GPIO
> framework does not yet support removal of an in-use controller a
> suspend/resume operation will result in a crash.
> 
> This patch provides suspend and resume functions for the DLN2 driver
> so that the above scenario is avoided.
> 
> Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>

This patch looks good now, but how did you say this device was powered?

If powered by vbus you cannot assume that the device maintains it's
state over a suspend cycle, something which would complicate matters
quite a bit...

Thanks,
Johan
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