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Commit 6754f556 authored by Mark Langsdorf's avatar Mark Langsdorf Committed by Rafael J. Wysocki
Browse files

cpufreq / highbank: add support for highbank cpufreq 



Highbank processors depend on the external ECME to perform voltage
management based on a requested frequency. Communication between the
A9 cores and the ECME happens over the pl320 IPC channel.

Signed-off-by: default avatarMark Langsdorf <mark.langsdorf@calxeda.com>
Reviewed-by: default avatarShawn Guo <shawn.guo@linaro.org>
Reviewed-by: default avatarMike Turquette <mturquette@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 30058677

arch/arm/boot/dts/highbank.dts

+10 −0
Original line number Diff line number Diff line
@@ -37,6 +37,16 @@ 
			next-level-cache = <&L2>;

			clocks = <&a9pll>;

			clock-names = "cpu";

			operating-points = <

				/* kHz    ignored */

				 1300000  1000000

				 1200000  1000000

				 1100000  1000000

				  800000  1000000

				  400000  1000000

				  200000  1000000

			>;

			clock-latency = <100000>;

		};



		cpu@901 {

arch/arm/mach-highbank/Kconfig

+2 −0
Original line number Diff line number Diff line 
config ARCH_HIGHBANK

	bool "Calxeda ECX-1000/2000 (Highbank/Midway)" if ARCH_MULTI_V7

	select ARCH_HAS_CPUFREQ

	select ARCH_HAS_OPP

	select ARCH_WANT_OPTIONAL_GPIOLIB

	select ARM_AMBA

	select ARM_GIC

drivers/cpufreq/Kconfig.arm

+15 −0
Original line number Diff line number Diff line
@@ -83,3 +83,18 @@ config ARM_SPEAR_CPUFREQ 
	default y

	help

	  This adds the CPUFreq driver support for SPEAr SOCs.



config ARM_HIGHBANK_CPUFREQ

	tristate "Calxeda Highbank-based"

	depends on ARCH_HIGHBANK

	select CPU_FREQ_TABLE

	select GENERIC_CPUFREQ_CPU0

	select PM_OPP

	select REGULATOR



	default m

	help

	  This adds the CPUFreq driver for Calxeda Highbank SoC

	  based boards.



	  If in doubt, say N.

drivers/cpufreq/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o 
obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ)	+= exynos5250-cpufreq.o

obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)	+= omap-cpufreq.o

obj-$(CONFIG_ARM_SPEAR_CPUFREQ)		+= spear-cpufreq.o

obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)	+= highbank-cpufreq.o



##################################################################################

# PowerPC platform drivers

drivers/cpufreq/cpufreq-cpu0.c

+5 −1
Original line number Diff line number Diff line
@@ -182,7 +182,11 @@ static int cpu0_cpufreq_driver_init(void) 
	struct device_node *np;

	int ret;



	np = of_find_node_by_path("/cpus/cpu@0");

	for_each_child_of_node(of_find_node_by_path("/cpus"), np) {

		if (of_get_property(np, "operating-points", NULL))

			break;

	}



	if (!np) {

		pr_err("failed to find cpu0 node\n");

		return -ENOENT;