From: jbrunet@baylibre.com (Jerome Brunet)
To: linus-amlogic@lists.infradead.org
Subject: [PATCH] ARM64: dts: meson-gxbb: p20x: add card regulator settle times
Date: Tue, 1 Aug 2017 17:22:24 +0200 [thread overview]
Message-ID: <20170801152224.15754-1-jbrunet@baylibre.com> (raw)
Changing the card voltage on the p200 is not instantaneous, especially
when switching from 3.3v to 1.8v.
I take at least 70ms 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: ef8d2ffedf18 ("ARM64: dts: meson-gxbb: add MMC support")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi
index 9603a635c7af..d3b194c20b72 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi
@@ -84,6 +84,9 @@
/* Based on P200 schematics, signal CARD_1.8V/3.3V_CTR */
states = <1800000 0
3300000 1>;
+
+ regulator-settling-time-up-us = <10000>;
+ regulator-settling-time-down-us = <150000>;
};
vddio_boot: regulator-vddio_boot {
--
2.9.4
next reply other threads:[~2017-08-01 15:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-01 15:22 Jerome Brunet [this message]
2017-08-01 19:49 ` Kevin Hilman
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