linux-kernel - Re: [PATCH v6 2/7] pwm: pca9685: Support hardware readout

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Date:   Mon, 29 Mar 2021 18:33:56 +0200
From:   Clemens Gruber <clemens.gruber@...ruber.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     linux-pwm@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Sven Van Asbroeck <TheSven73@...il.com>,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v6 2/7] pwm: pca9685: Support hardware readout

Hi Uwe,

On Mon, Mar 29, 2021 at 05:51:40PM +0200, Uwe Kleine-König wrote:
> Hello Clemens,
> 
> On Mon, Mar 29, 2021 at 02:57:02PM +0200, Clemens Gruber wrote:
> > The hardware readout may return slightly different values than those
> > that were set in apply due to the limited range of possible prescale and
> > counter register values.
> 
> This is fine and for most hardware that's not preventable. My
> requirement here is that 
> 
> 	.get_state(pwm, &state);
> 	.apply_state(pwm, &state);
> 
> doesn't yield any changes.

Yes, that would not change anything.

Thanks,
Clemens