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cpufreq / highbank: add support for highbank cpufreq

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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: Mark Langsdorf <mark.langsdorf@calxeda.com>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mark Langsdorf
2013-01-28 16:13:15 +00:00
committed by Rafael J. Wysocki
parent 300586778d
commit 6754f55610
6 changed files with 149 additions and 2 deletions
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6
drivers/cpufreq/cpufreq-cpu0.c
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@@ -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;