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authorChen-Yu Tsai <wens@csie.org>2016-11-17 10:34:38 +0100
committerMaxime Ripard <maxime.ripard@free-electrons.com>2017-01-10 18:52:41 +0100
commit80ee72e7e9acee39e66db4037a2235f23236ab94 (patch)
tree5d2cd11ea22e0a2c3f73982dff1387a022afea2c /arch/arm/boot/dts/sun8i-a23-a33.dtsi
parentARM: sunxi: Convert pinctrl nodes to generic bindings (diff)
downloadlinux-80ee72e7e9acee39e66db4037a2235f23236ab94.tar.xz
linux-80ee72e7e9acee39e66db4037a2235f23236ab94.zip
ARM: dts: sunxi: Explicitly enable pull-ups for MMC pins
In the past, all the MMC pins had allwinner,pull = <SUN4I_PINCTRL_NO_PULL>; which was actually a no-op. We were relying on U-boot to set the bias pull up for us. These properties were removed as part of the fix up to actually support no bias on the pins. During the transition some boards experienced regular MMC time-outs during normal operation, while others completely failed to initialize the SD card. Given that MMC starts in open-drain mode and the pull-ups are required, it's best to enable it for all the pin settings. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Diffstat (limited to 'arch/arm/boot/dts/sun8i-a23-a33.dtsi')
-rw-r--r--arch/arm/boot/dts/sun8i-a23-a33.dtsi3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/sun8i-a23-a33.dtsi b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
index ecb49a5a7615..bc3e936edfcf 100644
--- a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
+++ b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
@@ -293,6 +293,7 @@
"PF3", "PF4", "PF5";
function = "mmc0";
drive-strength = <30>;
+ bias-pull-up;
};
mmc1_pins_a: mmc1@0 {
@@ -300,6 +301,7 @@
"PG3", "PG4", "PG5";
function = "mmc1";
drive-strength = <30>;
+ bias-pull-up;
};
mmc2_8bit_pins: mmc2_8bit {
@@ -309,6 +311,7 @@
"PC15", "PC16";
function = "mmc2";
drive-strength = <30>;
+ bias-pull-up;
};
pwm0_pins: pwm0 {