This patchset adds DVFS (Dynamic Voltage and Frequency Scaling) capability to Exynos4210 memory-bus and vdd_int of the SoC. The Exynos4210 Bus Devfreq driver uses PPMU counters of memory controllers (DMC0/DMC1 of Exynos4210), and adjusts OPP based on the current load. In other to support Exynos4210-bus devfreq driver (patch 2/4), we have added patches: 1/4: Enable DMC1, Enable PPMU for DMC0/1. 3/4: Remove compiler errors in Exynos4-Nuri board (Nuri is the test board for this driver) 4/4: Add Exynos4210-bus devfreq device to Nuri board. Note that any Exynos4210 board may add this capability by adding the platform device "exynos4210-busfreq" and provide a regulator (VDD_INT) to the added device. ASV (Adaptive Supply Voltage) capability has been introduced in the ARM-kernel mailing list. However, it has not been merged, yet. Thus, the device driver (exynos4210_memorybus.c) has a symbol "CONFIG_EXYNOS4_ASV" to block ASV-related code. With support of ASV, this devfreq driver reduces power consumption futher; most Exynos4210 SoCs have lower voltage requirement than the worst case (ASV number 0) scenario. MyungJoo Ham (4): ARM: EXYNOS4: Add DMC1, allow PPMU access for DMC. PM/Devfreq: Add Exynos4210-bus device DVFS driver. ARM Exynos4210-Nuri: remove compiler errors ARM Exynos4210-Nuri: support Exynos4210-bus Devfreq driver. arch/arm/mach-exynos/cpu.c | 7 +- arch/arm/mach-exynos/include/mach/map.h | 1 + arch/arm/mach-exynos/mach-nuri.c | 13 +- drivers/devfreq/Kconfig | 12 + drivers/devfreq/Makefile | 3 + drivers/devfreq/exynos4210_memorybus.c | 636 +++++++++++++++++++++++++++++++ 6 files changed, 668 insertions(+), 4 deletions(-) create mode 100644 drivers/devfreq/exynos4210_memorybus.c -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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