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

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Message-ID: <20210329155140.4gjtsw2qbpylv77z@pengutronix.de>
Date:   Mon, 29 Mar 2021 17:51:40 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Clemens Gruber <clemens.gruber@...ruber.com>
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

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.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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