Messages in this thread Patch in this message | | | From | Jerome Brunet <> | Subject | [PATCH v2 4/9] ARM64: dts: meson-gxbb: nanopi-k2: add card regulator settle times | Date | Mon, 21 Aug 2017 18:06:32 +0200 |
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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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