Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1704155

[PATCH 1/6] ARM64: dts: meson-gxbb: nanopi-k2: add card regulator settle times

Show all headers | View raw

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 fa462831ccaf..6b7495dc6014 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 {
-- 
2.9.4

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 0/6] ARM64: dts: meson: update around mmc Jerome Brunet <jbrunet@baylibre.com> - 2017-08-04 20:10 +0200
  [PATCH 1/6] ARM64: dts: meson-gxbb: nanopi-k2: add card regulator settle times Jerome Brunet <jbrunet@baylibre.com> - 2017-08-04 20:10 +0200
  [PATCH 4/6] ARM64: dts: meson-gxbb: nanopi-k2: enable sdcard UHS modes Jerome Brunet <jbrunet@baylibre.com> - 2017-08-04 20:10 +0200
    Re: [PATCH 4/6] ARM64: dts: meson-gxbb: nanopi-k2: enable sdcard UHS modes Kevin Hilman <khilman@baylibre.com> - 2017-08-07 23:50 +0200

csiph-web