Merge tag 'nds32-for-linus-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux

* NDS32 Performance Monitor Units

NDS32 core have a PMU for counting cpu and cache events like cache misses.

The NDS32 PMU representation in the device tree should be done as under:

Required properties:

- compatible :

	"andestech,nds32v3-pmu"

- interrupts : The interrupt number for NDS32 PMU is 13.

Example:

pmu{

	compatible = "andestech,nds32v3-pmu";

	interrupts = <13>;

}

	select HANDLE_DOMAIN_IRQ

	select HAVE_ARCH_TRACEHOOK

	select HAVE_DEBUG_KMEMLEAK

	select HAVE_EXIT_THREAD

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_PERF_EVENTS

	select IRQ_DOMAIN

	select LOCKDEP_SUPPORT

	select MODULES_USE_ELF_RELA

menu "Kernel Features"

source "kernel/Kconfig.hz"

endmenu

menu "Power management options"

config SYS_SUPPORTS_APM_EMULATION

	bool

config ARCH_SUSPEND_POSSIBLE

	def_bool y

source "kernel/power/Kconfig"

endmenu

	bool "Little endian"

	default y

config FPU

	bool "FPU support"

	default n

	help

	  If FPU ISA is used in user space, this configuration shall be Y to

          enable required support in kerenl such as fpu context switch and

          fpu exception handler.

	  If no FPU ISA is used in user space, say N.

config LAZY_FPU

	bool "lazy FPU support"

	depends on FPU

	default y

	help

	  Say Y here to enable the lazy FPU scheme. The lazy FPU scheme can

          enhance system performance by reducing the context switch

	  frequency of the FPU register.

	  For nomal case, say Y.

config SUPPORT_DENORMAL_ARITHMETIC

	bool "Denormal arithmetic support"

	depends on FPU

	default n

	help

	  Say Y here to enable arithmetic of denormalized number. Enabling

	  this feature can enhance the precision for tininess number.

	  However, performance loss in float pointe calculations is

	  possibly significant due to additional FPU exception.

	  If the calculated tolerance for tininess number is not critical,

	  say N to prevent performance loss.

config HWZOL

	bool "hardware zero overhead loop support"

	depends on CPU_D10 || CPU_D15

	  Say Y here to enable L2 cache if your SoC are integrated with L2CC.

	  If unsure, say N.

config HW_PRE

	bool "Enable hardware prefetcher"

	default y

	help

	  Say Y here to enable hardware prefetcher feature.

	  Only when CPU_VER.REV >= 0x09 can support.

menu "Memory configuration"

choice

comma = ,

ifdef CONFIG_FUNCTION_TRACER

arch-y += -malways-save-lp -mno-relax

endif

# Avoid generating FPU instructions

arch-y  += -mno-ext-fpu-sp -mno-ext-fpu-dp -mfloat-abi=soft

KBUILD_CFLAGS	+= $(call cc-option, -mno-sched-prolog-epilog)

KBUILD_CFLAGS	+= -mcmodel=large

# If we have a machine-specific directory, then include it in the build.

core-y				+= arch/nds32/kernel/ arch/nds32/mm/

core-$(CONFIG_FPU)              += arch/nds32/math-emu/

libs-y				+= arch/nds32/lib/

ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'

			interrupts = <18>;

		};

	};

	pmu {

		compatible = "andestech,nds32v3-pmu";

		interrupts= <13>;

	};

};