linux-kernel - Re: [PATCH v2 02/12] timekeeping: add API for getting timekeeping

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Message-ID: <CABYd82Z4pgJpYVhJEGjgbWgSQp7if_=Rf03VmTu+U9D3b=dVzA@mail.gmail.com>
Date:   Wed, 29 Sep 2021 13:01:31 -0700
From:   Will McVicker <willmcvicker@...gle.com>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Lee Jones <lee.jones@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Android Kernel Team <kernel-team@...roid.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH v2 02/12] timekeeping: add API for getting timekeeping_suspended

On Tue, Sep 28, 2021 at 8:42 PM John Stultz <john.stultz@...aro.org> wrote:
>
> On Tue, Sep 28, 2021 at 4:56 PM Will McVicker <willmcvicker@...gle.com> wrote:
> >
> > This allows modules to access the value of timekeeping_suspended without
> > giving them write access to the variable.
> >
>
> It's important to cover "the why" not "the what" in these commit
> messages, so you might add a note as to what code will be the user of
> this (the samsung/clk-pll.c code changed later in this series).
>
> thanks
> -john

Thanks John for the tip. I will try to be better at that in the followup.

For this specific patch, I am adding this new API because the Samsung
PLL driver (drivers/clk/samsung/clk-pll.c) currently is using the
variable 'timekeeping_suspended' to detect timeouts before the
clocksource is initialized or timekeeping itself is suspended. My
patch series aims to modularize the Samsung PLL driver. So to keep the
driver's functionality intact, I need to add this additional API.

--Will