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    Subject[PATCH AUTOSEL 5.6 01/68] cpufreq: imx6q: Fixes unwanted cpu overclocking on i.MX6ULL
    Date
    From: Christoph Niedermaier <cniedermaier@dh-electronics.com>

    [ Upstream commit 36eb7dc1bd42fe5f850329c893768ff89b696fba ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/cpufreq/imx6q-cpufreq.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c
    index 648a09a1778a3..1fcbbd53a48a2 100644
    --- a/drivers/cpufreq/imx6q-cpufreq.c
    +++ b/drivers/cpufreq/imx6q-cpufreq.c
    @@ -280,6 +280,9 @@ static int imx6ul_opp_check_speed_grading(struct device *dev)
    void __iomem *base;

    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;

    --
    2.20.1
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