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    Subject[PATCH v2 4/9] ARM64: dts: meson-gxbb: nanopi-k2: add card regulator settle times
    Date
    Changing the card voltage on the nanopi-k2 is not instantaneous,
    especially when switching from 3.3v to 1.8v.

    It take at least 3ms for the regulator to go from 3.3v to 1.8v. Add
    margin to that to make sure we don't upset the sdcard during the voltage
    switch

    Fixes: 9bc7ffb08daf ("arm64: dts: amlogic: Add NanoPi K2")
    Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
    ---
    arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
    index e4c6b2fd52ee..de4ed28d78bc 100644
    --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
    +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
    @@ -107,6 +107,9 @@

    states = <3300000 0>,
    <1800000 1>;
    +
    + regulator-settling-time-up-us = <100>;
    + regulator-settling-time-down-us = <5000>;
    };

    wifi_32k: wifi-32k {
    --
    2.9.5
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