[PATCH] cpufreq: imx-cpufreq-dt: Add "cpu-supply" property check

From: Anson Huang
Date: Mon Feb 17 2020 - 04:48:45 EST

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@xxxxxxx>
drivers/cpufreq/imx-cpufreq-dt.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/imx-cpufreq-dt.c b/drivers/cpufreq/imx-cpufreq-dt.c
index 6cb8193..0e29d88 100644
--- 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;