cpufreq: tegra20: Check if this is Tegra20 machine

Don't even try to request the clocks during of module initialization on
non-Tegra20 machines (this is the case for a multi-platform kernel) for
consistency.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/tegra20-cpufreq.c b/drivers/cpufreq/tegra20-cpufreq.c
index 36075ae..7b425eb 100644 (file)
--- a/drivers/cpufreq/tegra20-cpufreq.c
+++ b/drivers/cpufreq/tegra20-cpufreq.c
@@ -21,6 +21,7 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/types.h>
 
 static struct cpufreq_frequency_table freq_table[] = {
@@ -158,6 +159,9 @@ static int __init tegra_cpufreq_init(void)
 {
        int err;
 
+       if (!of_machine_is_compatible("nvidia,tegra20"))
+               return -ENODEV;
+
        cpu_clk = clk_get_sys(NULL, "cclk");
        if (IS_ERR(cpu_clk))
                return PTR_ERR(cpu_clk);