linux-kernel - Re: [PATCH v2 2/4] pwm: Add Apple PWM controller

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Message-ID: <CAMT+MTQLJZsDSOtcQqV8e_j0XKfjNm+dVjeo7ocMjcYOPLAPvA@mail.gmail.com>
Date:   Wed, 2 Nov 2022 19:25:50 +0300
From:   Sasha Finkelstein <fnkl.kernel@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "marcan@...can.st" <marcan@...can.st>,
        "sven@...npeter.dev" <sven@...npeter.dev>,
        "alyssa@...enzweig.io" <alyssa@...enzweig.io>,
        "asahi@...ts.linux.dev" <asahi@...ts.linux.dev>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] pwm: Add Apple PWM controller

On Wed, 2 Nov 2022 at 19:02, Biju Das <biju.das.jz@...renesas.com> wrote:

> I just asked, because you are unnecessarily turning on the clock or increasing the usage
> Count, even if it is not used by anyone during probe.

It is used to get the clock rate so it can be used to convert between
seconds and pwm ticks, and the pwm uses that clock, so it is kept
enabled while the pwm is active.