linux-kernel - Re: [PATCH v5 6/6] mfd: tps6586x: register restart handler

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Date:   Thu, 20 Apr 2023 16:32:29 +0200
From:   Benjamin Bara <bbara93@...il.com>
To:     lee@...nel.org
Cc:     bbara93@...il.com, benjamin.bara@...data.com,
        dmitry.osipenko@...labora.com, jonathanh@...dia.com,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, peterz@...radead.org,
        rafael.j.wysocki@...el.com, richard.leitner@...ux.dev,
        treding@...dia.com, wsa@...nel.org
Subject: Re: [PATCH v5 6/6] mfd: tps6586x: register restart handler

Thanks for the feedback!

On Thu, 20 Apr 2023 at 16:04, Lee Jones <lee@...nel.org> wrote:
> Why 20 here and 50 in the other patch?

The data sheet states:
The device will enter the SLEEP or HARD REBOOT state 10ms after the
SLEEP REQUEST or REBOOT REQUEST is initiated.

Also:
When the reboot request state is set an internal timer TWAIT (10ms typ)
is started (...). The reboot request ends when t > TWAIT.

But in the electrical characteristics, TWAIT is given as min 18, typ 20,
max 22.

In my observations, reboot took like typ 15ms and sleep typ 25ms, but
this might be very board-specific. I can set both to 50ms to be "on the
safe side" and have a common value?

Thanks and best regards,
Benjamin