arm64: dts: meson: bananapi-m5: switch VDDIO_C pin to OPEN_DRAIN

[ Upstream commit 856968e066bd77b113965f1a355ec7401edff65f ]

For proper warm (re)boot from SD card the BPI-M5 board requires TFLASH_VDD_EN
and VDDIO_C pins to be switched to high impedance mode. This can be achieved
using OPEN_DRAIN instead of ACTIVE_HIGH to leave the GPIO pins in input mode
and retain high state (pin has the pull-up).

This change is inspired by meson-sm1-odroid.dtsi where OPEN_DRAIN has been
used to resolve similar problems with the Odroid C4 board (TF_IO in the C4
dts is the equivalent regulator).

Fixes: 976e920183e4 ("arm64: dts: meson-sm1: add Banana PI BPI-M5 board dts")
Suggested-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230127142221.3718184-2-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-bananapi-m5.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-bananapi-m5.dts
index 6d0db667581faa92a0d804a61c8d0f641e39fbc7..38ebe98ba9c6b39137805014c9c6c7dab23141cb 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-sm1-bananapi-m5.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-sm1-bananapi-m5.dts
@@ -123,7 +123,7 @@
                regulator-min-microvolt = <1800000>;
                regulator-max-microvolt = <3300000>;
 
-               enable-gpio = <&gpio_ao GPIOE_2 GPIO_ACTIVE_HIGH>;
+               enable-gpio = <&gpio_ao GPIOE_2 GPIO_OPEN_DRAIN>;
                enable-active-high;
                regulator-always-on;