On 2015년 12월 18일 09:34, Chanwoo Choi wrote: > Hi, > > On 2015년 12월 15일 12:41, Krzysztof Kozlowski wrote: >> On 14.12.2015 15:38, Chanwoo Choi wrote: >>> This patch adds the generic exynos bus frequency driver for AMBA AXI bus >>> of sub-blocks in exynos SoC with DEVFREQ framework. The Samsung Exynos SoC >>> have the common architecture for bus between DRAM and sub-blocks in SoC. >>> This driver can support the generic bus frequency driver for Exynos SoCs. >>> >>> In devicetree, Each bus block has a bus clock, regulator, operation-point >>> and devfreq-event devices which measure the utilization of each bus block. >>> >>> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> >>> [linux.amoon: Tested on Odroid U3] >>> Tested-by: Anand Moon <linux.amoon@xxxxxxxxx> >>> --- >>> drivers/devfreq/Kconfig | 15 ++ >>> drivers/devfreq/Makefile | 1 + >>> drivers/devfreq/exynos/Makefile | 1 + >>> drivers/devfreq/exynos/exynos-bus.c | 449 ++++++++++++++++++++++++++++++++++++ >>> 4 files changed, 466 insertions(+) >>> create mode 100644 drivers/devfreq/exynos/exynos-bus.c >>> >>> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig >>> index 64281bb2f650..55ec774f794c 100644 >>> --- a/drivers/devfreq/Kconfig >>> +++ b/drivers/devfreq/Kconfig >>> @@ -66,6 +66,21 @@ config DEVFREQ_GOV_USERSPACE >>> >>> comment "DEVFREQ Drivers" >>> >>> +config ARM_EXYNOS_BUS_DEVFREQ >>> + bool "ARM EXYNOS Generic Memory Bus DEVFREQ Driver" >>> + depends on ARCH_EXYNOS >>> + select DEVFREQ_GOV_SIMPLE_ONDEMAND >>> + select DEVFREQ_EVENT_EXYNOS_PPMU >>> + select PM_DEVFREQ_EVENT >>> + select PM_OPP >>> + help >>> + This adds the common DEVFREQ driver for Exynos Memory bus. Exynos >>> + Memory bus has one more group of memory bus (e.g, MIF and INT block). >>> + Each memory bus group could contain many memoby bus block. It reads >>> + PPMU counters of memory controllers by using DEVFREQ-event device >>> + and adjusts the operating frequencies and voltages with OPP support. >>> + This does not yet operate with optimal voltages. >>> + >>> config ARM_EXYNOS4_BUS_DEVFREQ >>> bool "ARM Exynos4210/4212/4412 Memory Bus DEVFREQ Driver" >>> depends on (CPU_EXYNOS4210 || SOC_EXYNOS4212 || SOC_EXYNOS4412) && !ARCH_MULTIPLATFORM >>> diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile >>> index 5134f9ee983d..375ebbb4fcfb 100644 >>> --- a/drivers/devfreq/Makefile >>> +++ b/drivers/devfreq/Makefile >>> @@ -6,6 +6,7 @@ obj-$(CONFIG_DEVFREQ_GOV_POWERSAVE) += governor_powersave.o >>> obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o >>> >>> # DEVFREQ Drivers >>> +obj-$(CONFIG_ARCH_EXYNOS) += exynos/ >> >> Why limiting it to ARCH_EXYNOS? Are there real dependencies on exynos >> mach code? Or on ARM code? > > There is no dependency. > >> >> If not, then this probably should be obj-y to allow compile testing. >> Particular objects would be selected by ARM_EXYNOS_BUS_DEVFREQ. > > OK. I'll alter it as obj-y. As you commented, CONFIG_ARM_EXYNOS_BUS_DEVFREQ is more appropriate without exynos/ directory as following: +obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o Best Regards, Chanwoo Choi -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
