cpufreq: imx-cpufreq-dt: Add "cpu-supply" property check

The cpufreq-dt driver allows cpufreq driver enabled without valid
regulator assigned, however, all i.MX platforms using cpufreq-dt
driver now require valid regulator, add "cpu-supply" property check
to avoid i.MX platforms' cpufreq enabled without valid regulator
and lead to system unstable.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
index 6cb8193..0e29d88 100644 (file)
--- a/drivers/cpufreq/imx-cpufreq-dt.c
+++ b/drivers/cpufreq/imx-cpufreq-dt.c
@@ -31,6 +31,9 @@ static int imx_cpufreq_dt_probe(struct platform_device *pdev)
        int speed_grade, mkt_segment;
        int ret;
 
+       if (!of_find_property(cpu_dev->of_node, "cpu-supply", NULL))
+               return -ENODEV;
+
        ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value);
        if (ret)
                return ret;