linux-kernel - [PATCH v3 0/8] NVIDIA Tegra clocksource driver improvements

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Date:   Fri, 24 May 2019 18:32:45 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joseph Lo <josephl@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Chauvet <kwizart@...il.com>
Subject: [PATCH v3 0/8] NVIDIA Tegra clocksource driver improvements

Hello,

This series primarily unifies the driver code across all Tegra SoC
generations. In a result the clocksources are allocated per-CPU on
older Tegra's and have a higher rating than the arch-timer, the newer
Tegra210 is getting support for microsecond clocksource and the driver's
code is getting much cleaner. Note that arch-timer usage is discouraged on
all Tegra's due to the time jitter caused by the CPU frequency scaling.

The series was extensively tested on Tegra20 and Tegra30.

Changelog:

v3: Fixed compilation on ARM64. Turned out that it doesn't have the
    delay-timer, thanks to Nicolas Chauvet for the report.

    Added new "Support COMPILE_TEST universally" patch for better
    compile-test coverage.

v2: Rebased on recent linux-next. Now all of #ifdef's are removed from the
    code due to the recent patch that generalized persistent clocksource.

    Couple other minor cosmetic changes.

Dmitry Osipenko (8):
  clocksource/drivers/tegra: Support per-CPU timers on all Tegra's
  clocksource/drivers/tegra: Unify timer code
  clocksource/drivers/tegra: Reset hardware state on init
  clocksource/drivers/tegra: Replace readl/writel with relaxed versions
  clocksource/drivers/tegra: Release all IRQ's on request_irq() error
  clocksource/drivers/tegra: Minor code clean up
  clocksource/drivers/tegra: Use SPDX identifier
  clocksource/drivers/tegra: Support COMPILE_TEST universally

 drivers/clocksource/Kconfig         |   4 +-
 drivers/clocksource/timer-tegra20.c | 276 +++++++++++++---------------
 2 files changed, 127 insertions(+), 153 deletions(-)

-- 
2.21.0