linux-kernel - Re: [PATCH 1/2 v2] device-tree: nexus7-flo: Remove power gpio key entry and use pmic8xxx-pwrkey

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Date:	Fri, 15 Apr 2016 14:58:26 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Stephen Boyd <stephen.boyd@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	Vinay Simha BN <simhavcs@...il.com>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	devicetree@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 1/2 v2] device-tree: nexus7-flo: Remove power gpio key
 entry and use pmic8xxx-pwrkey

On Fri, Apr 15, 2016 at 11:59 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> From: Stephen Boyd <sboyd@...eaurora.org>
> Subject: [PATCH] Input: pmic8xxx-pwrkey: Fix algorithm for converting trigger
>  delay
>
> The trigger delay algorithm that converts from microseconds to
> the register value looks incorrect. According to most of the PMIC
> documentation, the equation is
>
>         delay (Seconds) = (1 / 1024) * 2 ^ (x + 4)
>
> except for one case where the documentation looks to have a
> formatting issue and the equation looks like
>
>         delay (Seconds) = (1 / 1024) * 2 x + 4
>
> Most likely this driver was written with the improper
> documentation to begin with. According to the downstream sources
> the valid delays are from 2 seconds to 1/64 second, and the
> latter equation just doesn't make sense for that. Let's fix the
> algorithm and the range check to match the documentation and the
> downstream sources.
>
> Reported-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: John Stultz <john.stultz@...aro.org>
> Fixes: 92d57a73e410 ("input: Add support for Qualcomm PMIC8XXX power key")
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>

This works great for me, and lets me zap the pwrkey node in my dts.

Tested-by: John Stultz <john.stultz@...aro.org>

I'll also send an updated variant of my patch that only removes the gpio key.

thanks!
-john