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Tomasz Figaarndb
Tomasz Figa
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arndb
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clocksource: add samsung pwm timer driver
This adds a new clocksource driver for the PWM timer that is present in most Samsung SoCs, based on the existing driver in arch/arm/plat-samsung/samsung-time.c and many changes implemented by Tomasz Figa. Originally, the conversion of all Samsung machines to the new driver was planned for 3.10, but that work ended up being too late and too invasive just before the merge window. Unfortunately, other changes in the Exynos platform resulted in some Exynos4 setups, particularly the Universal C210 board to be broken. In order to fix that with minimum risk, so we now leave the existing pwm clocksource driver in place for all older platforms and use the new driver only for device tree enabled boards. This way, we can get the broken machines running again using DT descriptions. All clocksource changes were implemented by Tomasz, while the DT registration was rewritten by Arnd. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Tomasz Figa <t.figa@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de>
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‎drivers/clocksource/Kconfig‎

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@@ -67,3 +67,13 @@ config CLKSRC_METAG_GENERIC
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def_bool y if METAG
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help
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This option enables support for the Meta per-thread timers.
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config CLKSRC_SAMSUNG_PWM
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def_bool ARCH_EXYNOS4
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depends on OF
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select CLKSRC_MMIO
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help
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This is a new clocksource driver for the PWM timer found in
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Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
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for all devicetree enabled platforms. This driver will be
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needed only on systems that do not have the Exynos MCT available.

‎drivers/clocksource/Makefile‎

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@@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o
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obj-$(CONFIG_SUNXI_TIMER) += sunxi_timer.o
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obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o
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obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o
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obj-$(CONFIG_CLKSRC_SAMSUNG_PWM) += samsung_pwm_timer.o
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obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
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obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o

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