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From: Will McVicker <willmcvicker@google.com>
To: John Stultz <john.stultz@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Lee Jones <lee.jones@linaro.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Saravana Kannan <saravanak@google.com>,
	Android Kernel Team <kernel-team@android.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	"open list:COMMON CLK FRAMEWORK" <linux-clk@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	linux-rtc@vger.kernel.org
Subject: Re: [PATCH v2 02/12] timekeeping: add API for getting timekeeping_suspended
Date: Wed, 29 Sep 2021 13:01:31 -0700	[thread overview]
Message-ID: <CABYd82Z4pgJpYVhJEGjgbWgSQp7if_=Rf03VmTu+U9D3b=dVzA@mail.gmail.com> (raw)
In-Reply-To: <CALAqxLUju1Bw0dDpi_oK6-eOiP6B2Xm1MV19G53WaRFm3Z_AWw@mail.gmail.com>

On Tue, Sep 28, 2021 at 8:42 PM John Stultz <john.stultz@linaro.org> wrote:
>
> On Tue, Sep 28, 2021 at 4:56 PM Will McVicker <willmcvicker@google.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

WARNING: multiple messages have this Message-ID (diff)
From: Will McVicker <willmcvicker@google.com>
To: John Stultz <john.stultz@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>,
	 Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	 Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	 Sylwester Nawrocki <s.nawrocki@samsung.com>,
	Tomasz Figa <tomasz.figa@gmail.com>,
	 Chanwoo Choi <cw00.choi@samsung.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	 Thomas Gleixner <tglx@linutronix.de>,
	Lee Jones <lee.jones@linaro.org>,
	 Geert Uytterhoeven <geert@linux-m68k.org>,
	Saravana Kannan <saravanak@google.com>,
	 Android Kernel Team <kernel-team@android.com>,
	 linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	lkml <linux-kernel@vger.kernel.org>,
	 Linux Samsung SOC <linux-samsung-soc@vger.kernel.org>,
	 "open list:COMMON CLK FRAMEWORK" <linux-clk@vger.kernel.org>,
	 "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	linux-rtc@vger.kernel.org
Subject: Re: [PATCH v2 02/12] timekeeping: add API for getting timekeeping_suspended
Date: Wed, 29 Sep 2021 13:01:31 -0700	[thread overview]
Message-ID: <CABYd82Z4pgJpYVhJEGjgbWgSQp7if_=Rf03VmTu+U9D3b=dVzA@mail.gmail.com> (raw)
In-Reply-To: <CALAqxLUju1Bw0dDpi_oK6-eOiP6B2Xm1MV19G53WaRFm3Z_AWw@mail.gmail.com>

On Tue, Sep 28, 2021 at 8:42 PM John Stultz <john.stultz@linaro.org> wrote:
>
> On Tue, Sep 28, 2021 at 4:56 PM Will McVicker <willmcvicker@google.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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-09-29 20:01 UTC|newest]

Thread overview: 166+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-28 23:56 [PATCH v2 00/12] arm64: Kconfig: Update ARCH_EXYNOS select configs Will McVicker
2021-09-28 23:56 ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 01/12] arm64: don't have ARCH_EXYNOS select EXYNOS_CHIPID Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29 13:58   ` (subset) " Krzysztof Kozlowski
2021-09-29 13:58     ` Krzysztof Kozlowski
2021-09-29 14:00   ` Krzysztof Kozlowski
2021-09-29 14:00     ` Krzysztof Kozlowski
2021-09-28 23:56 ` [PATCH v2 02/12] timekeeping: add API for getting timekeeping_suspended Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29  3:42   ` John Stultz
2021-09-29  3:42     ` John Stultz
2021-09-29 20:01     ` Will McVicker [this message]
2021-09-29 20:01       ` Will McVicker
2021-09-29 20:46       ` John Stultz
2021-09-29 20:46         ` John Stultz
2021-09-30 18:31         ` Will McVicker
2021-09-30 18:31           ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 03/12] clk: samsung: add support for CPU clocks Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 04/12] clk: samsung: exynos5433: update apollo and atlas clock probing Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 05/12] clk: export __clk_lookup Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-10-08  4:31   ` Stephen Boyd
2021-10-08  4:31     ` Stephen Boyd
2021-09-28 23:56 ` [PATCH v2 06/12] clk: samsung: modularize exynos arm64 clk drivers Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 07/12] clk: samsung: set exynos arm64 clk driver as tristate Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29 13:09   ` Krzysztof Kozlowski
2021-09-29 13:09     ` Krzysztof Kozlowski
2021-09-28 23:56 ` [PATCH v2 08/12] pinctrl: samsung: modularize the ARM and ARM64 pinctrls Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29  2:01   ` Chanho Park
2021-09-29  2:01     ` Chanho Park
2021-09-28 23:56 ` [PATCH v2 09/12] pinctrl: samsung: set PINCTRL_EXYNOS and PINCTRL_SAMSUNG as tristate Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-28 23:56 ` [PATCH v2 10/12] soc: samsung: pmu: modularize the Exynos ARMv8 PMU driver Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29 13:11   ` Krzysztof Kozlowski
2021-09-29 13:11     ` Krzysztof Kozlowski
2021-09-28 23:56 ` [PATCH v2 11/12] soc: samsung: pm_domains: modularize EXYNOS_PM_DOMAINS Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29 13:36   ` Krzysztof Kozlowski
2021-09-29 13:36     ` Krzysztof Kozlowski
2021-09-28 23:56 ` [PATCH v2 12/12] ARM: rtc: remove HAVE_S3C_RTC in favor of direct dependencies Will McVicker
2021-09-28 23:56   ` Will McVicker
2021-09-29 11:52   ` Alexandre Belloni
2021-09-29 11:52     ` Alexandre Belloni
2021-09-29 13:02 ` [PATCH v2 00/12] arm64: Kconfig: Update ARCH_EXYNOS select configs Krzysztof Kozlowski
2021-09-29 13:02   ` Krzysztof Kozlowski
2021-09-29 19:48   ` Will McVicker
2021-09-29 19:48     ` Will McVicker
2021-09-30  6:14     ` Krzysztof Kozlowski
2021-09-30  6:14       ` Krzysztof Kozlowski
2021-09-30  9:01       ` Arnd Bergmann
2021-09-30  9:01         ` Arnd Bergmann
2021-09-30  9:30         ` Lee Jones
2021-09-30  9:30           ` Lee Jones
2021-09-30 10:33           ` Krzysztof Kozlowski
2021-09-30 10:33             ` Krzysztof Kozlowski
2021-09-30 12:34             ` Lee Jones
2021-09-30 12:34               ` Lee Jones
2021-09-30 12:38               ` Krzysztof Kozlowski
2021-09-30 12:38                 ` Krzysztof Kozlowski
2021-09-30 10:05         ` Geert Uytterhoeven
2021-09-30 10:05           ` Geert Uytterhoeven
2021-09-30  9:23       ` Lee Jones
2021-09-30  9:23         ` Lee Jones
2021-09-30 10:17         ` Geert Uytterhoeven
2021-09-30 10:17           ` Geert Uytterhoeven
2021-09-30 10:56           ` Lee Jones
2021-09-30 10:56             ` Lee Jones
2021-09-30 11:25             ` Geert Uytterhoeven
2021-09-30 11:25               ` Geert Uytterhoeven
2021-09-30 12:08               ` Lee Jones
2021-09-30 12:08                 ` Lee Jones
2021-09-30 16:09                 ` Geert Uytterhoeven
2021-09-30 16:09                   ` Geert Uytterhoeven
2021-09-30 10:52         ` Krzysztof Kozlowski
2021-09-30 10:52           ` Krzysztof Kozlowski
2021-09-30 12:32           ` Lee Jones
2021-09-30 12:32             ` Lee Jones
2021-09-30 11:01         ` Tomasz Figa
2021-09-30 11:01           ` Tomasz Figa
2021-09-30 11:27           ` Geert Uytterhoeven
2021-09-30 11:27             ` Geert Uytterhoeven
2021-09-30 11:51           ` Lee Jones
2021-09-30 11:51             ` Lee Jones
2021-09-30 12:10             ` Tomasz Figa
2021-09-30 12:10               ` Tomasz Figa
2021-09-30 12:15               ` Krzysztof Kozlowski
2021-09-30 12:15                 ` Krzysztof Kozlowski
2021-09-30 12:45               ` Lee Jones
2021-09-30 12:45                 ` Lee Jones
2021-10-01  4:01               ` Christoph Hellwig
2021-10-01  4:01                 ` Christoph Hellwig
2021-10-01  4:52                 ` Saravana Kannan
2021-10-01  4:52                   ` Saravana Kannan
2021-10-01  4:55                   ` Christoph Hellwig
2021-10-01  4:55                     ` Christoph Hellwig
2021-09-30 12:21         ` Krzysztof Kozlowski
2021-09-30 12:21           ` Krzysztof Kozlowski
2021-09-30 12:39           ` Lee Jones
2021-09-30 12:39             ` Lee Jones
2021-09-30 13:08             ` Krzysztof Kozlowski
2021-09-30 13:08               ` Krzysztof Kozlowski
2021-09-30 13:29               ` Lee Jones
2021-09-30 13:29                 ` Lee Jones
2021-09-30 16:12                 ` Geert Uytterhoeven
2021-09-30 16:12                   ` Geert Uytterhoeven
2021-09-30 16:21                   ` Lee Jones
2021-09-30 16:21                     ` Lee Jones
2021-09-30 16:26                     ` Geert Uytterhoeven
2021-09-30 16:26                       ` Geert Uytterhoeven
2021-09-30 18:02                       ` Will McVicker
2021-09-30 18:02                         ` Will McVicker
2021-10-01  4:04             ` Christoph Hellwig
2021-10-01  4:04               ` Christoph Hellwig
2021-10-01  4:52     ` Olof Johansson
2021-10-01  4:52       ` Olof Johansson
2021-10-01  5:23       ` Saravana Kannan
2021-10-01  5:23         ` Saravana Kannan
2021-10-01  5:35         ` Olof Johansson
2021-10-01  5:35           ` Olof Johansson
2021-10-01  5:59           ` Will McVicker
2021-10-01  5:59             ` Will McVicker
2021-10-01  8:01             ` Krzysztof Kozlowski
2021-10-01  8:01               ` Krzysztof Kozlowski
2021-10-01  6:02           ` Saravana Kannan
2021-10-01  6:02             ` Saravana Kannan
2021-10-01  6:27             ` Olof Johansson
2021-10-01  6:27               ` Olof Johansson
2021-10-01  6:30               ` Olof Johansson
2021-10-01  6:30                 ` Olof Johansson
2021-10-01 12:00             ` Arnd Bergmann
2021-10-01 12:00               ` Arnd Bergmann
2021-10-01 12:31               ` Lee Jones
2021-10-01 12:31                 ` Lee Jones
2021-10-01 15:43                 ` Olof Johansson
2021-10-01 15:43                   ` Olof Johansson
2021-10-01 11:38           ` Linus Walleij
2021-10-01 11:38             ` Linus Walleij
2021-10-01 11:59           ` Geert Uytterhoeven
2021-10-01 11:59             ` Geert Uytterhoeven
2021-10-01 15:59             ` Olof Johansson
2021-10-01 15:59               ` Olof Johansson
2021-10-01 16:51               ` Will McVicker
2021-10-01 16:51                 ` Will McVicker
2021-10-01 17:15                 ` Olof Johansson
2021-10-01 17:15                   ` Olof Johansson
2021-10-01 17:48                   ` Will McVicker
2021-10-01 17:48                     ` Will McVicker
2021-10-01  8:19         ` Geert Uytterhoeven
2021-10-01  8:19           ` Geert Uytterhoeven
2021-10-01  9:00           ` Arnd Bergmann
2021-10-01  9:00             ` Arnd Bergmann
2021-10-01 15:27             ` Olof Johansson
2021-10-01 15:27               ` Olof Johansson
2021-10-01 19:26               ` Saravana Kannan
2021-10-01 19:26                 ` Saravana Kannan
2021-10-02  1:47                 ` Tomasz Figa
2021-10-02  1:47                   ` Tomasz Figa
2021-10-02 21:03                 ` Olof Johansson
2021-10-02 21:03                   ` Olof Johansson

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