linux-kernel - Re: [PATCH v7 03/13] hwmon: pwm-fan: Use 64-bit division macros for period and duty cycle

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Message-ID: <20200310222418.GA8053@codeaurora.org>
Date:   Tue, 10 Mar 2020 15:24:18 -0700
From:   Guru Das Srinagesh <gurus@...eaurora.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-pwm@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        linux-kernel@...r.kernel.org, Kamil Debski <kamil@...as.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jean Delvare <jdelvare@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v7 03/13] hwmon: pwm-fan: Use 64-bit division macros for
 period and duty cycle

On Tue, Mar 10, 2020 at 08:05:58AM -0700, Guenter Roeck wrote:
> I don't see support in the LED subsystem to utilize the PWM framework directly
> for blinking. Plus, you say yourself that it isn't a _real_ use case, just a
> theoretic one.

An example use case is a mobile phone OEM that wishes to set a period of
5 seconds or more for, say, a low battery slow blinking indication - currently
this is not possible. The PWM framework not having direct support for
blinking should not be a concern if the PWM peripheral being controlled
supports it via register writes.

> Either case, the reason / use case for this series should be explained
> in the summary patch. That is what it is for. That case is not made.

Will upload a new patchset adding more details in the summary patch.

Thank you.

Guru Das.