linux-kernel - Re: [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line on cold boot

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Date:	Mon, 16 Mar 2015 17:12:32 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line
 on cold boot

On Mon, Mar 16, 2015 at 04:58:42PM +0000, Charles Keepax wrote:

> On the first boot of the wm5110 it is important the reset line is held
> for slightly longer to ensure the device starts up well. This patch adds
> a 5mS delay for this.

How can we tell what first boot is - what happens if the device is fully
powered off during system suspend for example?  I'd expect to see this
done for system resume as well if we don't know power was maintained (or
whatever else the distinction is).

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