cpufreq: imx6q: Fixes unwanted cpu overclocking on i.MX6ULL
imx6ul_opp_check_speed_grading is called for both i.MX6UL and i.MX6ULL.
Since the i.MX6ULL was introduced to a separate ocotp compatible node
later, it is possible that the i.MX6ULL has also dtbs with
"fsl,imx6ull-ocotp". On a system without nvmem-cell speed grade a
missing check on this node causes a driver fail without considering
the cpu speed grade.
This patch prevents unwanted cpu overclocking on i.MX6ULL with compatible
node "fsl,imx6ull-ocotp" in old dtbs without nvmem-cell speed grade.
Fixes: 2733fb0d0699 ("cpufreq: imx6q: read OCOTP through nvmem for imx6ul/imx6ull")
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
index 648a09a..1fcbbd5 100644
--- a/drivers/cpufreq/imx6q-cpufreq.c
+++ b/drivers/cpufreq/imx6q-cpufreq.c
@@ -281,6 +281,9 @@ static int imx6ul_opp_check_speed_grading(struct device *dev)
np = of_find_compatible_node(NULL, NULL, "fsl,imx6ul-ocotp");
if (!np)
+ np = of_find_compatible_node(NULL, NULL,
+ "fsl,imx6ull-ocotp");
+ if (!np)
return -ENOENT;
base = of_iomap(np, 0);
