[PATCH 0/5] Exynos SoCs: enable support for ARM Architected Timers

From: Marek Szyprowski <m.szyprowski@samsung.com>
To: linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH 0/5] Exynos SoCs: enable support for ARM Architected Timers
Date: Mon, 26 Aug 2019 12:31:39 +0200	[thread overview]
Message-ID: <20190826103142.3477-1-m.szyprowski@samsung.com> (raw)
In-Reply-To: CGME20190826103201eucas1p1358f33d8fbdc8cef8ba2ebdcb1b3a51a@eucas1p1.samsung.com

Dear All,

ARM Architected Timers are present in all CortexA7/A15 based Samsung
Exynos SoCs. So far they were not enabled, because there were some issues
related to their initialization. Samsung Exynos SoCs used custom timer
hardware - Exynos MultiCore Timer. It turned out that enabling MCT it is
also needed to get ARM Architected Timers working, because they both
share some common hardware blocks (global system counter).

This patchset enables support for ARM Architected Timer driver together
with a standard Exynos MultiCore Timer driver, which is kept as a default
timer source on ARM 32bit platforms. Support for ARM architected timers
is essential for enabling proper KVM support on those platforms.

Some of the MCT cleanup patches were earlier a part of the similar
patchset for ARM64-based Exynos5433 SoC.

Best regards
Marek Szyprowski
Samsung R&D Institute Poland

Marek Szyprowski (5):
  clocksource: exynos_mct: Remove dead code
  clocksource: exynos_mct: Fix error path in timer resources
    initialization
  clocksource: exynos_mct: Increase priority over ARM arch timer
  ARM: dts: exynos: Add support ARM architected timers
  ARM: exynos: Enable support for ARM architected timers

 arch/arm/boot/dts/exynos3250.dtsi | 10 ++++++++++
 arch/arm/boot/dts/exynos5250.dtsi |  1 +
 arch/arm/boot/dts/exynos54xx.dtsi | 10 ++++++++++
 arch/arm/mach-exynos/Kconfig      |  1 +
 drivers/clocksource/exynos_mct.c  | 27 +++++++++++++++++----------
 include/linux/cpuhotplug.h        |  2 +-
 6 files changed, 40 insertions(+), 11 deletions(-)

-- 
2.17.1