On Fri, Apr 15, 2016 at 11:59 AM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
> From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> 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@xxxxxxxxxx>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Fixes: 92d57a73e410 ("input: Add support for Qualcomm PMIC8XXX power key")
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
This works great for me, and lets me zap the pwrkey node in my dts.
Tested-by: John Stultz <john.stultz@xxxxxxxxxx>
I'll also send an updated variant of my patch that only removes the gpio key.
thanks!
-john
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